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Stockholders' Equity - Stock Option Plans and Restricted Stock Units Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended
Dec. 28, 2014
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Mar. 28, 2014
Mar. 27, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock awards granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross        
Number of shares available for issuance         1,550,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant 2,306,256us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Total number of awards outstanding           5,511,322ktos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndOtherThanOptionsOutstandingNumber
Total unrecognized stock-based compensation expense related to nonvested options $ 1.5us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions $ 1.5us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions        
Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based incentive award vesting period   5 years        
Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based incentive award vesting period   10 years        
Stock Options and Restricted Stock Units | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based incentive award vesting period   10 years        
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation expense, period for recognition   3 years 3 months 18 days        
Stock options | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based incentive award vesting period   6 years        
Award term or expiration period   10 years        
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized stock-based compensation expense, period for recognition   2 years 8 months 12 days        
Total unrecognized stock-based compensation expense related to nonvested restricted stock units 8.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
8.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
       
Fair value of vested awards   $ 1.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 1.7us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 1.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
2014 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for issuance 3,208,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ktos_TwoThousandFourteenPlanMember
3,208,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ktos_TwoThousandFourteenPlanMember
       
Total number of awards outstanding           5,511,322ktos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndOtherThanOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= ktos_TwoThousandFourteenPlanMember