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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2013	Aug. 02, 2013
Document And Entity Information
Entity Registrant Name	KRATOS DEFENSE & SECURITY SOLUTIONS, INC.
Entity Central Index Key	0001069258
Current Fiscal Year End Date	--12-29
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		57,005,546

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2013	Dec. 30, 2012
Current assets:
Cash and cash equivalents	$ 49.7	$ 49.0
Restricted cash	5.2	5.5
Accounts receivable, net	253.6	271.9
Inventoried costs	85.3	94.3
Prepaid expenses	18.4	17.4
Other current assets	5.6	17.3
Total current assets	417.8	455.4
Property, plant and equipment, net	83.5	85.6
Goodwill	596.4	596.4
Intangible assets, net	87.8	106.1
Other assets	36.8	40.4
Total assets	1,222.3	1,283.9
Current liabilities:
Accounts payable	64.9	83.6
Accrued expenses	39.1	46.4
Accrued compensation	39.8	47.8
Accrued interest	6.1	6.3
Billings in excess of costs and earnings on uncompleted contracts	45.6	43.7
Deferred income tax liability	29.0	28.9
Other current liabilities	14.1	22.1
Total current liabilities	238.6	278.8
Long-term debt principal, net of current portion	629.3	629.7
Long-term debt premium	16.6	18.7
Other long-term liabilities	29.7	32.6
Total liabilities	914.2	959.8
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized, 0 shares outstanding at December 30, 2012 and June 30, 2013	0.0	0.0
Common stock, $0.001 par value, 195,000,000 shares authorized; 56,613,024 and 56,675,080 shares issued and outstanding at December 30, 2012 and June 30, 2013, respectively	0.0	0.0
Additional paid-in capital	850.9	847.1
Accumulated other comprehensive loss	(0.7)	(0.8)
Accumulated deficit	(542.1)	(522.2)
Total stockholders' equity	308.1	324.1
Total liabilities and stockholders’ equity	$ 1,222.3	$ 1,283.9

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2013	Dec. 30, 2012
Preferred Stock:
Shares authorized (in shares)	5,000,000	5,000,000
Par value (in dollars per share)	$ 0.001	$ 0.001
Shares outstanding (in shares)	0	0
Common Stock:
Par value (in dollars per share)	$ 0.001	$ 0.001
Shares authorized (in shares)	195,000,000	195,000,000
Shares issued (in shares)	56,675,080	56,613,024
Shares outstanding (in shares)	56,675,080	56,613,024

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012
Service revenues	$ 110.2	$ 112.1	$ 226.2	$ 214.2
Product sales	125.0	107.7	262.3	215.1
Total revenues	235.2	219.8	488.5	429.3
Cost of service revenues	83.3	86.7	171.9	166.5
Cost of product sales	91.5	75.4	190.4	147.7
Total costs	174.8	162.1	362.3	314.2
Gross profit	60.4	57.7	126.2	115.1
Selling, general and administrative expenses	48.0	42.6	97.1	86.4
Merger and acquisition expenses	(2.6)	1.5	(2.5)	2.4
Research and development expenses	4.8	4.8	9.7	8.4
Unused office space and other restructuring	1.3	1.4	1.6	1.4
Operating income from continuing operations	8.9	7.4	20.3	16.5
Other income (expense):
Interest expense, net	(16.3)	(16.2)	(32.5)	(32.3)
Other income (expense), net	0.2	0.5	(0.6)	0.9
Total other expense, net	(16.1)	(15.7)	(33.1)	(31.4)
Loss from continuing operations before income taxes	(7.2)	(8.3)	(12.8)	(14.9)
Provision (benefit) for income taxes from continuing operations	(0.1)	6.6	2.7	2.5
Loss from continuing operations	(7.1)	(14.9)	(15.5)	(17.4)
Loss from discontinued operations	(2.5)	(2.3)	(4.4)	(2.8)
Net loss	$ (9.6)	$ (17.2)	$ (19.9)	$ (20.2)
Basic income (loss) per common share:
Net loss from continuing operations (in dollars per share)	$ (0.12)	$ (0.36)	$ (0.27)	$ (0.47)
Net Loss from discontinued operations (in dollars per share)	(0.05)	(0.05)	(0.08)	(0.07)
Net loss per common share (in dollars per share)	(0.17)	(0.41)	(0.35)	(0.54)
Diluted income (loss) per common share:
Net loss from continuing operations (in dollars per share)	(0.12)	(0.36)	(0.27)	(0.47)
Net Loss from discontinued operations (in dollars per share)	(0.05)	(0.05)	(0.08)	(0.07)
Net loss per common share (in dollars per share)	$ (0.17)	$ (0.41)	$ (0.35)	$ (0.54)
Weighted average common shares outstanding:
Basic (in shares)	56.6	41.7	56.6	37.1
Diluted (in shares)	56.6	41.7	56.6	37.1
Comprehensive Loss
Net loss from above	$ (9.6)	$ (17.2)	$ (19.9)	$ (20.2)
Other comprehensive income:
Change in cumulative translation adjustment	0.0	(0.2)	0.1	(0.2)
Other comprehensive income (loss), net of tax	0.0	(0.2)	0.1	(0.2)
Comprehensive loss	$ (9.6)	$ (17.4)	$ (19.8)	$ (20.4)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012
Operating activities:
Net loss	$ (19.9)	$ (20.2)
Less: Loss from discontinued operations	(4.4)	(2.8)
Loss from continuing operations	(15.5)	(17.4)
Adjustments to reconcile loss from continuing operations to net cash provided by operating activities from continuing operations:
Depreciation and amortization	27.8	25.9
Deferred income taxes	0.0	1.3
Stock-based compensation	3.9	2.3
Amortization of deferred financing costs	2.6	2.5
Amortization of premium on Senior Secured Notes	(2.1)	(2.1)
Provision for doubtful accounts	0.2	0.3
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	18.2	11.6
Inventoried costs	9.2	(9.6)
Prepaid expenses and other assets	(0.1)	(3.7)
Accounts payable	(18.9)	9.4
Accrued compensation	(8.1)	(6.6)
Accrued expenses	(7.8)	0.3
Accrued interest payable	(0.3)	0.0
Billings in excess of costs and earnings on uncompleted contracts	1.9	(2.3)
Income tax receivable and payable	4.1	(1.5)
Other liabilities	(6.7)	(0.6)
Net cash provided by operating activities from continuing operations	8.4	9.8
Investing activities:
Cash paid for acquisitions, net of cash acquired	1.2	(21.5)
Decrease in restricted cash	0.2	0.3
Proceeds from the sale of discontinued operations	0.4	0.0
Capital expenditures	(7.3)	(6.2)
Net cash used in investing activities from continuing operations	(5.5)	(27.4)
Financing activities:
Proceeds from the issuance of common stock	0.0	97.0
Cash paid for contingent acquisition consideration	(2.1)	(2.5)
Repayment of debt	(0.5)	(0.5)
Debt issuance costs	0.0	(1.0)
Other	(0.3)	(0.3)
Net cash provided by (used in) financing activities from continuing operations	(2.9)	92.7
Net cash flows of continuing operations	0.0	75.1
Net operating cash flows of discontinued operations	0.8	1.3
Effect of exchange rate changes on cash and cash equivalents	(0.1)	(0.3)
Net increase in cash and cash equivalents	0.7	76.1
Cash and cash equivalents at beginning of period	49.0	69.6
Cash and cash equivalents at end of period	$ 49.7	$ 145.7

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Significant Accounting Policies

All references to the “Company” and “Kratos” refer to Kratos Defense & Security Solutions, Inc., a Delaware corporation, and its subsidiaries.


(a)	Basis of Presentation

The information as of June 30, 2013 and for the three and six months ended June 24, 2012 and June 30, 2013 is unaudited. The condensed consolidated balance sheet as of December 30, 2012 was derived from the Company’s audited consolidated financial statements at that date. In the opinion of management, these unaudited condensed consolidated financial statements include all adjustments, consisting of normal recurring adjustments necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the interim periods presented. The results have been prepared in accordance with the instructions to Form 10-Q and do not necessarily include all information and footnotes necessary for presentation in accordance with accounting principles generally accepted in the U.S. (“GAAP”). These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the related notes included in the Company’s audited annual consolidated financial statements for the fiscal year ended December 30, 2012, included in the Company’s Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission ("SEC") on March 12, 2013 (the “Form 10-K”). Interim operating results are not necessarily indicative of operating results expected in subsequent periods or for the year as a whole.


(b)	Principles of Consolidation

The condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries for which all inter-company transactions have been eliminated in consolidation.


(c)	Fiscal Year

The Company has a 52/53 week fiscal year ending on the last Sunday of the calendar year, with interim fiscal periods ending on the last Sunday of each calendar quarter. The three and six month periods ended June 24, 2012 and June 30, 2013 consisted of 13 and 26 week periods, respectively. There were 53 calendar weeks in the fiscal year ended December 30, 2012 and there are 52 calendar weeks in the fiscal year ending on December 29, 2013.

(d) Accounting Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Such estimates include revenue recognition, allowance for doubtful accounts, warranties, inventory valuation, valuation of long-lived assets including identifiable intangibles and goodwill, accounting for income taxes including the related valuation allowance on the deferred tax asset and uncertain tax positions, contingencies and litigation, contingent acquisition consideration, stock-based compensation and business combination purchase price allocations. In the future, the Company may realize actual results that differ from the current reported estimates and if the estimates that the Company has used change in the future, such changes could have a material impact on the Company's consolidated financial position, results of operations and cash flows.

In accounting for our long-term contracts for production of products and services provided to the U.S. Government and provided to our PSS segment customers under fixed price contracts, we utilize both cost-to-cost and units produced measures under the percentage-of-completion method of accounting in accordance with the provisions of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 605, Revenue Recognition.

Due to the size and nature of many of our contracts accounted for under the percentage-of-completion method of accounting, the estimation of total revenues and costs at completion is complicated and subject to many variables. For example, estimates are made regarding the length of time to complete a contract since costs also include expected increases in wages, prices for materials and allocated fixed costs. Similarly, assumptions are made regarding the future impact of our efficiency initiatives and cost reduction efforts. Incentives, awards or penalties related to performance on contracts are considered in estimating revenue and profit rates and are recorded when there is sufficient information to assess anticipated performance. Suppliers' assertions are also assessed and considered in estimating costs and profit rates.

The Company closely monitors the consistent application of its critical accounting policies and compliance with contract accounting. Business operations personnel conduct periodic contract status and performance reviews. Also, regular and recurring evaluations of contract cost, scheduling and technical matters are performed by management personnel who are independent from the business operations personnel performing work under the contract. When adjustments in estimated contract revenues or costs are required, any significant changes from prior estimates are included in earnings in the current period ("the cumulative catch-up method").

(e) Accounting Standards Updates

In July 2013, the FASB issued Accounting Standards Update 2013-11 ("ASU 2013-11") "Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists" which states that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows. To the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The amendments in this ASU are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The Company does not believe that the adoption of this guidance will have a material impact on its consolidated financial statements.

In February 2013, the FASB issued ASU 2013-02 "Comprehensive Income: Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income," which requires entities to provide information about the amounts reclassified out of accumulated other comprehensive income by component. In addition, entities are required to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income but only if the amount is required under GAAP to be reclassified to net income in its entirety in the same reporting period. For other amounts that are not required under GAAP to be reclassified in their entirety to net income, entities are required to cross-reference to other disclosures required under GAAP that provide additional detail on these amounts. This standard is effective prospectively for reporting periods beginning after December 15, 2012. The Company adopted this standard in the quarter ended March 31, 2013, which did not have a material impact on its consolidated financial statements.

In December 2011 and February 2013, the FASB issued an amendment to the Balance Sheet topic of the Accounting Standards Codification ("ASC"), which requires entities to disclose both gross and net information about both derivatives and transactions eligible for offset in the statement of financial position and instruments and transactions subject to an agreement similar to a master netting agreement. The objective of the disclosure is to facilitate comparison between those entities that prepare their financial statements on the basis of GAAP and those entities that prepare their financial statements on the basis of International Financial Reporting Standards. This standard is effective for fiscal years, and interim periods within those years, beginning on or after January 1, 2013. Retrospective presentation for all comparative periods presented is required. Accordingly, the Company will adopt this amendment in the first quarter of fiscal year 2014. The Company does not believe that the adoption of this guidance will have a material impact on its consolidated financial statements.

Other than as noted above, there have been no changes in the Company's significant accounting policies for the six months ended June 30, 2013 as compared to the significant accounting policies described in the Form 10-K.


(f)	Concentrations and Uncertainties

The Company maintains cash balances at various financial institutions, and such balances commonly exceed the $250,000 insured amount by the Federal Deposit Insurance Corporation. The Company has not experienced any losses in such accounts, and management believes that the Company is not exposed to any significant credit risk with respect to such cash and cash equivalents.

Financial instruments, which subject the Company to potential concentrations of credit risk, consist principally of the Company’s billed and unbilled accounts receivable. The Company’s accounts receivable result from sales to customers within the federal government, state and local agencies and commercial customers in various industries. The Company performs ongoing credit evaluations of its commercial customers. Credit is extended based on evaluation of the customer’s financial condition, and collateral is not required. Accounts receivable are recorded at the invoiced amount and do not bear interest. See Note 11 for a discussion of the Company’s significant customers.

Fair Value of Financial Instruments	6 Months Ended
Fair Value of Financial Instruments	Jun. 30, 2013
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The carrying amounts and the related estimated fair values of the Company's long-term debt financial instruments not measured at fair value on a recurring basis at December 30, 2012 and June 30, 2013 are presented in Note 9. The carrying value of all other financial instruments, including cash equivalents, accounts receivable, accounts payable and short-term debt, approximated their estimated fair values at December 30, 2012 and June 30, 2013.

Significant Customers	6 Months Ended
Significant Customers	Jun. 30, 2013
Segment Reporting [Abstract]
Significant Customers	Significant Customers Revenue from the U.S. Government, which includes foreign military sales, includes revenue from contracts for which the Company is the prime contractor as well as those for which the Company is a subcontractor and the ultimate customer is the U.S. Government. The KGS segment has substantial revenue from the U.S. Government. Sales to the U.S. Government amounted to approximately $140.0 million and $152.2 million or 64% and 65% of total Kratos revenue for the three months ended June 24, 2012 and June 30, 2013, respectively, and approximately $280.9 million and $317.6 million, or 65% and 65%, of total revenue for the six months ended June 24, 2012 and June 30, 2013, respectively. The U.S. Government continues to focus on developing and implementing spending, tax, and other initiatives to reduce the deficit, create jobs, and stimulate the economy. Although defense spending is expected to remain a national priority within future federal budgets, the Budget Control Act of 2011 (“Budget Control Act”) committed the U.S. Government to reduce the federal deficit over the following ten years. Under the Budget Control Act, the Bi-Partisan Congressional Joint Select Committee on Deficit Reduction (“the Joint Committee”) was responsible for identifying $1.2 to $1.5 trillion in deficit reductions by November 30, 2011. The Joint Committee was unable to identify the reductions by this deadline and thereby triggered a provision of the Budget Control Act called “sequestration,” which requires very substantial automatic spending cuts that have started in 2013, are split between defense and non-defense programs, and continue over a nine-year period. On March 26, 2013, the President signed into law the Consolidated and Further Continuing Appropriations Act, 2013, which includes specific appropriations for the Company's major federal customers, including the DoD. On April 10, 2013, the President delivered his proposed FY 2014 budget to Congress. The President's $527 billion FY 2014 defense budget is slightly lower than final defense appropriations for FY 2013. While it largely reflects defense spending plans in the FY 2013 budget, it does not reflect the reductions mandated by Part II of the Budget Control Act. The Congressional appropriation and authorization of FY 2014 defense spending is likely to be marked by significant debate and an uncertain schedule. There continues to be uncertainty in how sequestration will ultimately be implemented, and there are many variables in how the law could be applied that make it difficult to determine the specific impacts. Any automatic reductions in national defense programs could impact the Company's significant customers, which in turn could impact the Company's business and financial results.

Summary of Significant Accounting Policies - Concentrations and Uncertainties (Details) - USD ($)	Jun. 30, 2013	Dec. 30, 2012	Jul. 27, 2011	Mar. 25, 2011	May 19, 2010
Debt Instrument [Line Items]
Principal amount outstanding	$ 630,300,000.0	$ 630,700,000.0
Revolving credit facility
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 69,300,000
Senior notes \| Senior Notes due June 2017
Debt Instrument [Line Items]
Stated interest rate percentage	10.00%
Principal amount outstanding	$ 625,000,000		$ 115,000,000	$ 285,000,000	$ 225,000,000

Acquisitions - Composite Engineering, Inc. (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions			3 Months Ended		6 Months Ended
	Jul. 02, 2012	May 14, 2012	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012
Business Acquisition [Line Items]
Proceeds from the issuance of common stock					$ 0.0	$ 97.0
Business Combination, Acquisition Related Costs			$ (2.6)	$ 1.5	(2.5)	2.4
Revenues			235.2	219.8	488.5	429.3
Operating income (loss)			8.9	7.4	20.3	16.5
Revolving credit facility
Business Acquisition [Line Items]
Outstanding borrowings			0.0		0.0
Composite Engineering, Inc.
Business Acquisition [Line Items]
Consideration transferred	$ 164.0
Aggregate amount of cash paid	$ 135.0
Number of shares given as part of purchase price	4.0
Purchase price per share	$ 5.94	$ 5.00
Common stock exchanged as consideration, value	$ 23.8
Business Combination, Amount Placed in Escrow	10.7
Business Combination, Contingent Consideration Arrangement, Working Capital Adjustment	1.0
Consideration transferred, retirement of acquiree's debt	2.5
Consideration transferred, settlement of pre-existing accounts receivable	3.0
Additional tax liability incurred	1.6
Business Combination, Goodwill and Intangible Assets, Tax Deductible	$ 140.6
Tax deductible goodwill, deduction realization period	15 years
Common stock issued for acquisitions	20.0	20.0
Gross proceeds from issuance of common stock		$ 100.0
Proceeds from the issuance of common stock		$ 97.0
Acquired accounts receivable, gross	$ 9.3
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			27.2		53.1
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			$ 3.6		$ 6.8
Business Combination, Acquisition Related Costs				$ 0.5		$ 0.8
Composite Engineering, Inc. \| Revolving credit facility
Business Acquisition [Line Items]
Outstanding borrowings	$ 40.0
Composite Engineering, Inc. \| Restricted Stock Units (RSUs) \| Management
Business Acquisition [Line Items]
Number of shares issued as part of long-term employement agreements	2.0
Fair value of shares issued as part of long-term employement agreements	$ 11.9
Share-based compensation, period for recognition	4 years

Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Jun. 30, 2013	Dec. 30, 2012	Jul. 02, 2012	Dec. 30, 2011
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 596.4	$ 596.4
Composite Engineering, Inc.
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash			$ 8.9
Accounts receivable			9.3
Inventoried costs			12.3
Other current assets			8.9
Property and equipment			8.1
Intangible assets			38.0
Goodwill			104.2
Total assets			189.7
Current liabilities			(25.7)
Net assets acquired			$ 164.0
Critical Infrastructure Business
Business Acquisition, Purchase Price Allocation [Abstract]
Accounts receivable				$ 23.4
Other assets				0.5
Intangible assets				2.0
Goodwill				2.6
Total assets				28.5
Current liabilities				(9.7)
Net assets acquired				$ 18.8

Acquisitions - Asset Purchase (Details) - Critical Infrastructure Business - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2013	Dec. 30, 2011
Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract]
Purchase price		$ 18.8
Recurring Critical Infrastructure Business revenues, percentage	15.00%
Business Combination, Acquired Receivables [Abstract]
Acquired accounts receivable, gross		24.4
Acquired accounts receivable, estimated uncollectible		$ (1.0)

Acquisitions - Contingent Acquisition Consideration (Details) - DEI Services Corporation - USD ($) $ in Millions	1 Months Ended
	Apr. 30, 2012	Jun. 30, 2013
Business Acquisition, Contingent Consideration [Line Items]
Business Acquisition, Contingent Consideration, Cumulative Amount Paid		$ 5.0
Cash payments	$ 2.1

Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 30, 2012	Jun. 24, 2012	Jun. 30, 2013
Goodwill [Line Items]
Goodwill		$ 596.4		$ 596.4
Restrospective adjustments				(0.1)
Accumulated impairment losses		247.4		247.4
Public Safety and Security
Goodwill [Line Items]
Goodwill		35.6
Restrospective adjustments				0.0
Accumulated impairment losses		18.3		$ 18.3
Kratos Government Solutions
Goodwill [Line Items]
Goodwill impairment charge associated with discontinued operations		82.0
Percentage that goodwill fair value exceeded its carrying value				7.40%
Goodwill		560.8
Restrospective adjustments				$ (0.1)
Accumulated impairment losses		229.1		$ 229.1
Discontinued operations
Goodwill [Line Items]
Goodwill impairment charge associated with discontinued operations	$ 1.5		$ 1.5
Scenario, Previously Reported [Member]
Goodwill [Line Items]
Goodwill		596.5
Scenario, Previously Reported [Member] \| Public Safety and Security
Goodwill [Line Items]
Goodwill		35.6
Scenario, Previously Reported [Member] \| Kratos Government Solutions
Goodwill [Line Items]
Goodwill		$ 560.9

Inventoried Costs (Details) - USD ($) $ in Millions	Jun. 30, 2013	Dec. 30, 2012
Inventory Disclosure [Abstract]
Raw materials	$ 42.4	$ 48.4
Work in process	36.5	36.5
Finished goods	5.3	7.3
Supplies and other	1.8	2.2
Total inventoried costs	86.0	94.4
Less: customer advances and progress payments	(0.7)	(0.1)
Total inventoried costs	$ 85.3	$ 94.3

Stockholders' Equity - Rollforward of Common Stock Outstanding (Details) - shares	6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares outstanding at beginning of the period	56,613,024	32,400,000
Stock issued for employee stock purchase plan, stock options and restricted stock units	100,000	100,000
Common stock issued for cash		20,000,000
Shares outstanding at end of the period	56,675,080	52,500,000

Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Millions	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012	Dec. 30, 2012
Income Tax Contingency [Line Items]
Unrecognized tax benefits that if recognized would affect effective tax rate				$ 13.4
Unrecognized tax benefits reduction relating to expiration of statutes of limitations		$ 2.0
Income tax penalties and interest expense	$ 0.3	0.0
Benefit for interest and penalties related to reversal of prior positions		(0.2)	$ (0.1)
Liabilities for uncertain tax positions that will expire within 12 months		0.1
Discontinued operations
Income Tax Contingency [Line Items]
Unrecognized tax benefits reduction relating to expiration of statutes of limitations		$ 0.1

Discontinued Operations (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
Discontinued Operations (Details) - USD ($) $ in Millions	Apr. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012	Dec. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total cash and assumption of liabilities for divested operations			$ 0.8		$ 0.8
Cash received for divested operations	$ 0.5						$ 0.3
Impairment charge related to revised estimate of the fair value of divested operations			1.2		1.2
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue			0.5	$ 1.8	3.6	$ 7.4
Net income (loss) before taxes			(2.5)	(2.3)	(4.4)	(2.9)
Benefit for income taxes			0.0	0.0	0.0	(0.1)
Net income (loss) after taxes			(2.5)	(2.3)	(4.4)	$ (2.8)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Cash			0.4		0.4		3.4
Accounts receivable, net			0.0		0.0		3.0
Other current assets			0.2		0.2		0.2
Current assets of discontinued operations			0.6		0.6		6.6
Property and equipment, net			0.0		0.0		0.4
Other non-current assets			0.0		0.0		0.4
Non-current assets of discontinued operations			0.0		0.0		0.8
Accounts payable			3.4		3.4		4.4
Accrued expenses			0.0		0.0		0.1
Other current liabilities			0.3		0.3		0.4
Current liabilities of discontinued operations			3.7		3.7		4.9
Other non-current liabilities			0.0		0.0		0.3
Non-current unrecognized tax liabilities			0.1		0.1		0.0
Non-current liabilities of discontinued operations			$ 0.1		$ 0.1		$ 0.3
Discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment charge associated with discontinued operations		$ 1.5		$ 1.5

Debt - $110.0 million Credit Facility (Details) - USD ($) shares in Millions, $ in Millions	Jul. 02, 2012	May 14, 2012	Jul. 27, 2011	Jun. 30, 2013	May 04, 2012	Nov. 14, 2011
CEI
Line of Credit Facility [Line Items]
Common stock issued for acquisitions	20.0	20.0
Revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 65.0	$ 110.0		$ 90.0
Maturity period			5 years
Maximum possible borrowing capacity subject to application and bank approval					$ 135.0
Outstanding borrowings				0.0
Remaining borrowing capacity				69.3
Revolving credit facility \| CEI
Line of Credit Facility [Line Items]
Outstanding borrowings	$ 40.0
Revolving credit facility \| Minimum
Line of Credit Facility [Line Items]
Fixed charge coverage ratio			1.25
Commitment fee			0.50%
Revolving credit facility \| Maximum
Line of Credit Facility [Line Items]
Commitment fee			0.75%
LIBOR base rate
Line of Credit Facility [Line Items]
Description of variable rate basis			LIBOR
LIBOR base rate \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate			3.00%
LIBOR base rate \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate			3.75%
Base rate other than LIBOR
Line of Credit Facility [Line Items]
Description of variable rate basis			federal funds rate
Base rate (the greater of prime rate or 0.5% over federal funds rate)			0.50%
Base rate (floor, 1.0% over one-month LIBOR)			1.00%
Base rate other than LIBOR \| Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate			1.00%
Base rate other than LIBOR \| Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate			1.75%
Letter of credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 50.0
Outstanding borrowings				$ 14.2
Swing line loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 10.0

Debt - Fair Value of Long-term Debt (Details) - USD ($)	Jun. 30, 2013	Dec. 30, 2012
Debt Disclosure [Abstract]
Principal amount outstanding	$ 630,300,000.0	$ 630,700,000.0
Carrying amount	646,900,000	649,400,000
Fair value	676,200,000	690,500,000
Long-term debt premium	$ 16,600,000	$ 18,700,000

Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
Segment Information (Details) $ in Millions	Jun. 30, 2013 USD ($)	Jun. 24, 2012 USD ($)	Jun. 30, 2013 USD ($) Segment	Jun. 24, 2012 USD ($)
Segment Reporting Information [Line Items]
Number of principal business segments \| Segment			2
Service revenues	$ 110.2	$ 112.1	$ 226.2	$ 214.2
Product sales	125.0	107.7	262.3	215.1
Revenues	235.2	219.8	488.5	429.3
Depreciation and amortization	13.6	12.3	27.8	25.9
Operating income	8.9	7.4	20.3	16.5
Kratos Government Solutions
Segment Reporting Information [Line Items]
Service revenues	58.5	68.1	123.9	129.6
Product sales	125.0	107.7	262.3	215.1
Revenues	183.5	175.8	386.2	344.7
Depreciation and amortization	12.7	11.4	25.9	24.2
Operating income	5.3	8.8	17.4	18.4
Public Safety and Security
Segment Reporting Information [Line Items]
Service revenues	51.7	44.0	102.3	84.6
Product sales	0.0	0.0	0.0	0.0
Revenues	51.7	44.0	102.3	84.6
Depreciation and amortization	0.9	0.9	1.9	1.7
Operating income	2.7	2.8	3.9	4.0
Unallocated corporate expense, net
Segment Reporting Information [Line Items]
Operating income	$ 0.9	$ (4.2)	$ (1.0)	$ (5.9)

Commitments and Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at beginning of the period	$ 5.3	$ 4.3
Costs accrued and revenues deferred	(0.1)	0.6
Warranty liabilities assumed from acquisitions	(0.2)	0.5
Settlements made (in cash or kind) and revenues recognized	0.0	(0.8)
Balance at end of period	5.0	4.6
Less: Current portion	4.6	4.6
Noncurrent accrued product warranty and deferred warranty revenue	$ 0.4	$ 0.0
Product Warranties \| Minimum
Warranty Coverage Period [Line Items]
Warranty coverage period	1 year
Product Warranties \| Maximum
Warranty Coverage Period [Line Items]
Warranty coverage period	10 years

Condensed Consolidating Financial Statements - Balance Sheet (Details) - USD ($)	Jun. 30, 2013	Dec. 30, 2012	Jun. 24, 2012	Dec. 25, 2011	Jul. 27, 2011	Mar. 25, 2011	May 19, 2010
Condensed Financial Statements, Captions [Line Items]
Principal amount outstanding	$ 630,300,000.0	$ 630,700,000.0
Current assets:
Cash and cash equivalents	49,700,000	49,000,000	$ 145,700,000	$ 69,600,000
Accounts receivable, net	253,600,000	271,900,000
Amounts due from affiliated companies	0	0
Inventoried costs	85,300,000	94,300,000
Other current assets	29,200,000	40,200,000
Total current assets	417,800,000	455,400,000
Property, plant and equipment, net	83,500,000	85,600,000
Goodwill	596,400,000	596,400,000
Intangible assets, net	87,800,000	106,100,000
Investment in subsidiaries	0	0
Amounts due from affiliated companies	0	0
Other assets	36,800,000	40,400,000
Total assets	1,222,300,000	1,283,900,000
Current liabilities:
Accounts payable	64,900,000	83,600,000
Accrued expenses	45,200,000	52,700,000
Accrued compensation	39,800,000	47,800,000
Billings in excess of costs and earnings on uncompleted contracts	45,600,000	43,700,000
Deferred income tax liability	29,000,000	28,900,000
Amounts due to affiliated companies	0	0
Other current liabilities	14,100,000	22,100,000
Total current liabilities	238,600,000	278,800,000
Long-term debt, net of current portion	645,900,000	648,400,000
Amounts due to affiliated companies	0	0
Other long-term liabilities	29,700,000	32,600,000
Total liabilities	914,200,000	959,800,000
Total stockholders' equity	308,100,000	324,100,000
Total liabilities and stockholders’ equity	1,222,300,000	1,283,900,000
Parent Company
Current assets:
Cash and cash equivalents	32,000,000	37,800,000
Accounts receivable, net	0	0
Amounts due from affiliated companies	451,900,000	480,200,000
Inventoried costs	0	0
Other current assets	10,900,000	9,100,000
Total current assets	494,800,000	527,100,000
Property, plant and equipment, net	1,700,000	1,300,000
Goodwill	0	0
Intangible assets, net	0	0
Investment in subsidiaries	456,200,000	439,800,000
Amounts due from affiliated companies	0	0
Other assets	15,100,000	17,600,000
Total assets	967,800,000	985,800,000
Current liabilities:
Accounts payable	4,100,000	2,800,000
Accrued expenses	7,200,000	7,000,000
Accrued compensation	3,300,000	2,900,000
Billings in excess of costs and earnings on uncompleted contracts	0	0
Deferred income tax liability	0	0
Amounts due to affiliated companies	0	0
Other current liabilities	900,000	1,100,000
Total current liabilities	15,500,000	13,800,000
Long-term debt, net of current portion	641,600,000	643,600,000
Amounts due to affiliated companies	0	0
Other long-term liabilities	2,600,000	4,300,000
Total liabilities	659,700,000	661,700,000
Total stockholders' equity	308,100,000	324,100,000
Total liabilities and stockholders’ equity	967,800,000	985,800,000
Guarantors on a Combined Basis
Current assets:
Cash and cash equivalents	(3,500,000)	(4,000,000)
Accounts receivable, net	237,000,000	253,500,000
Amounts due from affiliated companies	0	0
Inventoried costs	69,000,000	75,400,000
Other current assets	15,400,000	28,000,000
Total current assets	317,900,000	352,900,000
Property, plant and equipment, net	71,800,000	74,700,000
Goodwill	574,700,000	574,700,000
Intangible assets, net	85,800,000	103,400,000
Investment in subsidiaries	32,100,000	28,800,000
Amounts due from affiliated companies	24,000,000	24,000,000
Other assets	21,500,000	22,400,000
Total assets	1,127,800,000	1,180,900,000
Current liabilities:
Accounts payable	57,000,000	75,200,000
Accrued expenses	35,400,000	42,300,000
Accrued compensation	33,800,000	41,800,000
Billings in excess of costs and earnings on uncompleted contracts	38,400,000	40,500,000
Deferred income tax liability	29,000,000	28,900,000
Amounts due to affiliated companies	429,200,000	455,100,000
Other current liabilities	12,000,000	19,100,000
Total current liabilities	634,800,000	702,900,000
Long-term debt, net of current portion	0
Amounts due to affiliated companies	0	0
Other long-term liabilities	24,800,000	26,200,000
Total liabilities	659,600,000	729,100,000
Total stockholders' equity	468,200,000	451,800,000
Total liabilities and stockholders’ equity	1,127,800,000	1,180,900,000
Non-Guarantors on a Combined Basis
Current assets:
Cash and cash equivalents	21,200,000	15,200,000
Accounts receivable, net	16,600,000	18,400,000
Amounts due from affiliated companies	0	0
Inventoried costs	16,300,000	18,900,000
Other current assets	2,900,000	3,100,000
Total current assets	57,000,000	55,600,000
Property, plant and equipment, net	10,000,000	9,600,000
Goodwill	21,700,000	21,700,000
Intangible assets, net	2,000,000	2,700,000
Investment in subsidiaries	0	0
Amounts due from affiliated companies	0	0
Other assets	200,000	400,000
Total assets	90,900,000	90,000,000
Current liabilities:
Accounts payable	3,800,000	5,600,000
Accrued expenses	2,600,000	3,400,000
Accrued compensation	2,700,000	3,100,000
Billings in excess of costs and earnings on uncompleted contracts	7,200,000	3,200,000
Deferred income tax liability	0	0
Amounts due to affiliated companies	22,700,000	25,100,000
Other current liabilities	1,200,000	1,900,000
Total current liabilities	40,200,000	42,300,000
Long-term debt, net of current portion	4,300,000	4,800,000
Amounts due to affiliated companies	24,000,000	24,000,000
Other long-term liabilities	2,300,000	2,100,000
Total liabilities	70,800,000	73,200,000
Total stockholders' equity	20,100,000	16,800,000
Total liabilities and stockholders’ equity	90,900,000	90,000,000
Eliminations
Current assets:
Cash and cash equivalents	0	0
Accounts receivable, net	0	0
Amounts due from affiliated companies	(451,900,000)	(480,200,000)
Inventoried costs	0	0
Other current assets	0	0
Total current assets	(451,900,000)	(480,200,000)
Property, plant and equipment, net	0	0
Goodwill	0	0
Intangible assets, net	0	0
Investment in subsidiaries	(488,300,000)	(468,600,000)
Amounts due from affiliated companies	(24,000,000)	(24,000,000)
Other assets	0	0
Total assets	(964,200,000)	(972,800,000)
Current liabilities:
Accounts payable	0	0
Accrued expenses	0	0
Accrued compensation	0	0
Billings in excess of costs and earnings on uncompleted contracts	0	0
Deferred income tax liability	0	0
Amounts due to affiliated companies	(451,900,000)	(480,200,000)
Other current liabilities	0	0
Total current liabilities	(451,900,000)	(480,200,000)
Long-term debt, net of current portion	0	0
Amounts due to affiliated companies	(24,000,000)	(24,000,000)
Other long-term liabilities	0	0
Total liabilities	(475,900,000)	(504,200,000)
Total stockholders' equity	(488,300,000)	(468,600,000)
Total liabilities and stockholders’ equity	(964,200,000)	$ (972,800,000)
Senior notes \| Senior Notes due June 2017
Condensed Financial Statements, Captions [Line Items]
Principal amount outstanding	$ 625,000,000				$ 115,000,000	$ 285,000,000	$ 225,000,000