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Acquisitions - Composite Engineering, Inc. (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
May 14, 2012
Dec. 28, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 29, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Jul. 02, 2012
Jul. 31, 2013
Business Acquisition [Line Items]                            
Gross proceeds from issuance of common stock $ 100.0ktos_ProceedsFromIssuanceOfCommonStockGross                          
Proceeds from the issuance of common stock 97.0us-gaap_ProceedsFromIssuanceOfCommonStock                 0us-gaap_ProceedsFromIssuanceOfCommonStock 0us-gaap_ProceedsFromIssuanceOfCommonStock 97.0us-gaap_ProceedsFromIssuanceOfCommonStock    
Revenues                   868.0us-gaap_Revenues 950.6us-gaap_Revenues 969.2us-gaap_Revenues    
Operating income (loss)   10.7us-gaap_OperatingIncomeLoss 1.2us-gaap_OperatingIncomeLoss 4.7us-gaap_OperatingIncomeLoss 3.3us-gaap_OperatingIncomeLoss 5.4us-gaap_OperatingIncomeLoss 6.1us-gaap_OperatingIncomeLoss 8.9us-gaap_OperatingIncomeLoss 11.4us-gaap_OperatingIncomeLoss 19.9us-gaap_OperatingIncomeLoss 31.8us-gaap_OperatingIncomeLoss (49.7)us-gaap_OperatingIncomeLoss    
Revolving Credit Facility                            
Business Acquisition [Line Items]                            
Outstanding borrowings   41.0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
              41.0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
Restricted Stock Units (RSUs)                            
Business Acquisition [Line Items]                            
Share-based compensation, period for recognition                   2 years 8 months 12 days        
Composite Engineering, Inc.                            
Business Acquisition [Line Items]                            
Consideration transferred                         164.2us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
 
Aggregate amount of cash paid                         135.0us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
 
Common stock issued for acquisitions (in shares) 20,000,000us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
                      4,000,000us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
 
Purchase price (in dollars per share) $ 5.00us-gaap_SharePrice
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
                      $ 5.94us-gaap_SharePrice
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
 
Value of common stock exchanged as consideration                         23.8us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
 
Working capital adjustment                           1.0ktos_BusinessCombinationContingentConsiderationArrangementWorkingCapitalAdjustment
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
Consideration transferred, retirement of acquiree's debt                         5.5ktos_BusinessCombinationConsiderationTransferredRetirementOfAcquireesDebt
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
 
Tax deductible goodwill                         136.3us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
 
Tax deductible goodwill, deduction realization period                         15 years  
Gross proceeds from issuance of common stock 100.0ktos_ProceedsFromIssuanceOfCommonStockGross
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
                         
Proceeds from the issuance of common stock 97.0us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
                         
Revenues                       68.2us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
   
Operating income (loss)                       1.6us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
   
Composite Engineering, Inc. | Revolving Credit Facility                            
Business Acquisition [Line Items]                            
Outstanding borrowings 40.0us-gaap_LineOfCredit
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
                         
Composite Engineering, Inc. | Restricted Stock Units (RSUs) | Management                            
Business Acquisition [Line Items]                            
Number of shares issued as part of long-term employment agreements                         2,000,000us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
 
Fair value of shares issued as part of long-term employment agreements                         11.9us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
 
Share-based compensation, period for recognition                         4 years  
Number of shares unvested and not forfeited   520,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
              520,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ManagementMember
       
Composite Engineering, Inc. | Escrow account                            
Business Acquisition [Line Items]                            
Contingent consideration, fair value                         $ 10.7ktos_BusinessCombinationAmountPlacedInEscrow
/ us-gaap_BusinessAcquisitionAxis
= ktos_CompositeEngineeringIncMember
/ us-gaap_ContingentConsiderationByTypeAxis
= ktos_HoldbackEscrowMember