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Dividends (Details) (USD $)
0 Months Ended 3 Months Ended
Oct. 24, 2013
Dec. 27, 2014
Dec. 28, 2013
Dividends Payable [Line Items]      
Dividend payment date Oct. 23, 2014    
Dividend record date Oct. 09, 2014    
Class A Common Stock [Member]      
Dividends Payable [Line Items]      
Cash dividends per share of common stock $ 0.165us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.165us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.165us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B Common Stock [Member]      
Dividends Payable [Line Items]      
Cash dividends per share of common stock $ 0.15us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 0.150us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 0.150us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember