v3.8.0.1
Document and Entity Information - shares
3 Months Ended
Apr. 01, 2018
May 07, 2018
Document And Entity Information    
Entity Registrant Name KRATOS DEFENSE & SECURITY SOLUTIONS, INC.  
Entity Central Index Key 0001069258  
Current Fiscal Year End Date --12-30  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Apr. 01, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   103,513,103