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Income Taxes - Reconciliation of Income Tax Provision (Details) (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. 29, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]                      
Income tax expense (benefit) at federal statutory rate                 $ (25.5)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (11.1)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (40.1)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State taxes, net of federal tax benefit and valuation allowance                 0.8us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1.8us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 0.7us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Difference in tax rates between U.S. and foreign                 (2.0)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (2.6)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (1.5)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Nondeductible expense                 2.5us-gaap_IncomeTaxReconciliationNondeductibleExpense 0.7us-gaap_IncomeTaxReconciliationNondeductibleExpense 0.3us-gaap_IncomeTaxReconciliationNondeductibleExpense
Increase (decrease) in reserve for uncertain tax positions                 0.8us-gaap_IncomeTaxReconciliationTaxContingencies (1.4)us-gaap_IncomeTaxReconciliationTaxContingencies 0.1us-gaap_IncomeTaxReconciliationTaxContingencies
Transaction costs                 0ktos_IncomeTaxReconciliationTransactionCosts 0ktos_IncomeTaxReconciliationTransactionCosts 0.1ktos_IncomeTaxReconciliationTransactionCosts
Changes to indefinite life items and separate state deferred taxes                 1.6ktos_IncomeTaxReconciliationChangesToIndefiniteLifeItemsAndSeparateStateDeferredTaxes (0.4)ktos_IncomeTaxReconciliationChangesToIndefiniteLifeItemsAndSeparateStateDeferredTaxes (3.0)ktos_IncomeTaxReconciliationChangesToIndefiniteLifeItemsAndSeparateStateDeferredTaxes
Goodwill impairment                 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses 0us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses 27.6us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
Total 1.4us-gaap_IncomeTaxExpenseBenefit (0.2)us-gaap_IncomeTaxExpenseBenefit 1.6us-gaap_IncomeTaxExpenseBenefit 2.3us-gaap_IncomeTaxExpenseBenefit (2.9)us-gaap_IncomeTaxExpenseBenefit 0.2us-gaap_IncomeTaxExpenseBenefit (0.1)us-gaap_IncomeTaxExpenseBenefit 2.8us-gaap_IncomeTaxExpenseBenefit 5.1us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit (1.6)us-gaap_IncomeTaxExpenseBenefit
Federal                      
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]                      
Increase in federal valuation allowance                 $ 26.9us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
$ 13.0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
$ 14.2us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember