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Financial Instruments (Details) (USD $)
Dec. 28, 2014
Dec. 29, 2013
Cash and Cash Equivalents [Line Items]    
Long-term debt $ 609,800,000us-gaap_LongTermDebt $ 538,100,000us-gaap_LongTermDebt
Fair Value, Inputs, Level 2    
Cash and Cash Equivalents [Line Items]    
Long-term debt 250,000,000us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 250,000,000us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Money market funds    
Cash and Cash Equivalents [Line Items]    
Cash equivalents $ 0us-gaap_CashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember		 $ 300,000us-gaap_CashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember