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Debt - $110.0 million Credit Facility (Details) (USD $)
0 Months Ended 12 Months Ended
May 14, 2014
Dec. 28, 2014
May 04, 2012
Letter of Credit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity $ 50,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
   
Outstanding borrowings   13,600,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
 
Swing Line Loan      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 10,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ktos_SwingLineLoanMember
   
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity 110,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
  110,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Maturity period 5 years    
Potential Maximum Borrowing Capacity, Subject to Lender Approval 135,000,000.0ktos_LineOfCreditFacilityMaximumPossibleBorrowingsSubjectToApplicationAndBankApproval
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Fixed charge coverage ratio   1.15ktos_DebtInstrumentFixedChargeCoverageRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Outstanding borrowings   41,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Remaining borrowing capacity   45,100,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Revolving Credit Facility | Federal Funds Rate      
Line of Credit Facility [Line Items]      
Base rate (the greater of prime rate or 0.5% over federal funds rate)   0.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_FederalFundsEffectiveSwapRateMember
 
Revolving Credit Facility | LIBOR Rate      
Line of Credit Facility [Line Items]      
Base rate (floor, 1.0% over one-month LIBOR)   1.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Revolving Credit Facility | Base Rate | Minimum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
 
Revolving Credit Facility | Base Rate | Maximum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
 
Revolving Credit Facility | Eurodollar Rate | Minimum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_EurodollarMember
 
Revolving Credit Facility | Eurodollar Rate | Maximum      
Line of Credit Facility [Line Items]      
Basis spread on variable rate   3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_EurodollarMember