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Related Party Transactions (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Equity, Class of Treasury Stock [Line Items]    
Short-term non-interest bearing loans to investment/profit sharing plan $ 0.4us-gaap_LoansAndLeasesReceivableRelatedParties  
Shares authorized for repurchase   4.0us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Class B Common Stock [Member]    
Equity, Class of Treasury Stock [Line Items]    
Shares authorized for repurchase 2.5us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
1.5us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Purchase price of shares $ 65.0us-gaap_StockRepurchaseProgramAuthorizedAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 37.1us-gaap_StockRepurchaseProgramAuthorizedAmount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember