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Commitments- Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Commitments and Contingencies Disclosure [Abstract]      
Lease expense $ 43.5us-gaap_OperatingLeasesRentExpenseNet $ 45.6us-gaap_OperatingLeasesRentExpenseNet $ 48.3us-gaap_OperatingLeasesRentExpenseNet
Noncancelable purchase obligations $ 25.9us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount    
Obligation expected utilization period 2 years