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Goodwill and Other Intangible Assets - Purchased Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 28, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Acquired finite-lived intangible assets:              
Gross Value $ 212.6us-gaap_FiniteLivedIntangibleAssetsGross       $ 212.6us-gaap_FiniteLivedIntangibleAssetsGross $ 207.7us-gaap_FiniteLivedIntangibleAssetsGross  
Accumulated Amortization (167.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization       (167.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (144.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Total 45.4us-gaap_FiniteLivedIntangibleAssetsNet       45.4us-gaap_FiniteLivedIntangibleAssetsNet 63.0us-gaap_FiniteLivedIntangibleAssetsNet  
Acquired indefinite-lived intangible assets              
Total indefinite-lived intangible assets 6.9us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill       6.9us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 6.9us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill 6.9us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Total intangible assets, Gross Value 219.5ktos_IntangibleAssetsExcludingGoodwillGross       219.5ktos_IntangibleAssetsExcludingGoodwillGross 214.6ktos_IntangibleAssetsExcludingGoodwillGross  
Total intangible assets, Net Value 52.3us-gaap_IntangibleAssetsNetExcludingGoodwill       52.3us-gaap_IntangibleAssetsNetExcludingGoodwill 69.9us-gaap_IntangibleAssetsNetExcludingGoodwill  
Consolidated amortization expense related to intangible assets subject to amortization 8.9us-gaap_AmortizationOfIntangibleAssets 9.0us-gaap_AmortizationOfIntangibleAssets 9.0us-gaap_AmortizationOfIntangibleAssets 9.3us-gaap_AmortizationOfIntangibleAssets 22.5us-gaap_AmortizationOfIntangibleAssets 36.2us-gaap_AmortizationOfIntangibleAssets 43.9us-gaap_AmortizationOfIntangibleAssets
Customer relationships              
Acquired finite-lived intangible assets:              
Gross Value 99.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
      99.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
97.7us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
 
Accumulated Amortization (70.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
      (70.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
(53.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
 
Total 28.4us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
      28.4us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
44.0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
 
Contracts and backlog              
Acquired finite-lived intangible assets:              
Gross Value 82.7us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_ContractsAndBacklogMember
      82.7us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_ContractsAndBacklogMember
80.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_ContractsAndBacklogMember
 
Accumulated Amortization (80.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_ContractsAndBacklogMember
      (80.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_ContractsAndBacklogMember
(78.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_ContractsAndBacklogMember
 
Total 2.7us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_ContractsAndBacklogMember
      2.7us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_ContractsAndBacklogMember
1.3us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_ContractsAndBacklogMember
 
Developed technology and technical know-how              
Acquired finite-lived intangible assets:              
Gross Value 23.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
      23.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
22.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
 
Accumulated Amortization (10.9)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
      (10.9)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
(8.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
 
Total 12.2us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
      12.2us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
13.5us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
 
Trade names              
Acquired finite-lived intangible assets:              
Gross Value 6.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
      6.0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
6.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
 
Accumulated Amortization (5.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
      (5.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
(3.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
 
Total 1.0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
      1.0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
3.0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
 
Acquired indefinite-lived intangible assets              
Remaining useful life             2 years
Finite-lived intangible assets impairment charge             14.6us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Favorable operating lease              
Acquired finite-lived intangible assets:              
Gross Value 1.8us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_FavorableOperatingLeaseMember
      1.8us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_FavorableOperatingLeaseMember
1.8us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_FavorableOperatingLeaseMember
 
Accumulated Amortization (0.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_FavorableOperatingLeaseMember
      (0.7)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_FavorableOperatingLeaseMember
(0.6)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_FavorableOperatingLeaseMember
 
Total 1.1us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_FavorableOperatingLeaseMember
      1.1us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_FavorableOperatingLeaseMember
1.2us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= ktos_FavorableOperatingLeaseMember
 
Public Safety & Security              
Acquired indefinite-lived intangible assets              
Finite-lived intangible assets impairment charge             12.9us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_StatementBusinessSegmentsAxis
= ktos_PublicSafetyAndSecurityMember
Public Safety & Security | Trade names              
Acquired indefinite-lived intangible assets              
Finite-lived intangible assets impairment charge             12.9us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ktos_PublicSafetyAndSecurityMember
Kratos Government Solutions (KGS) | Trade names              
Acquired indefinite-lived intangible assets              
Finite-lived intangible assets impairment charge             $ 1.7us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
/ us-gaap_StatementBusinessSegmentsAxis
= ktos_KratosGovernmentSolutionsMember