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Income Taxes (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 26, 2014
Dec. 27, 2013
Income Taxes [Line Items]    
Increased (decrease) in valuation allowance $ (0.9)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ (0.2)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Federal and foreign tax operating loss carry-forwards 590.7us-gaap_OperatingLossCarryforwards  
Accrual for uncertain tax positions, that, if recognized would affect the effective income tax rate 3.0us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Unrecognized tax benefits expected to reverse in next 12 months 0.4us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound  
Interest on income taxes accrued 0.6us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax, Portion Attributable to Parent $ 1.9us-gaap_OtherComprehensiveIncomeLossTax