v3.5.0.2
Document and Entity Information - shares
9 Months Ended
Sep. 25, 2016
Oct. 28, 2016
Document And Entity Information    
Entity Registrant Name KRATOS DEFENSE & SECURITY SOLUTIONS, INC.  
Entity Central Index Key 0001069258  
Current Fiscal Year End Date --12-25  
Entity Filer Category Accelerated Filer  
Document Type 10-Q  
Document Period End Date Sep. 25, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   60,516,717