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Subsequent Event (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended
Dec. 30, 2014
Sep. 30, 2014
Jul. 01, 2014
Apr. 01, 2014
Dec. 31, 2013
Oct. 01, 2013
Jul. 02, 2013
Apr. 02, 2013
Dec. 30, 2014
Dec. 31, 2013
Jan. 01, 2013
Feb. 09, 2015
Feb. 27, 2015
Subsequent events                          
Cash dividends declared per common share (in dollars per share) $ 0.165us-gaap_CommonStockDividendsPerShareDeclared $ 0.165us-gaap_CommonStockDividendsPerShareDeclared $ 0.14us-gaap_CommonStockDividendsPerShareDeclared $ 0.14us-gaap_CommonStockDividendsPerShareDeclared $ 0.14us-gaap_CommonStockDividendsPerShareDeclared $ 0.14us-gaap_CommonStockDividendsPerShareDeclared $ 0.12us-gaap_CommonStockDividendsPerShareDeclared $ 0.12us-gaap_CommonStockDividendsPerShareDeclared $ 0.61us-gaap_CommonStockDividendsPerShareDeclared $ 0.52us-gaap_CommonStockDividendsPerShareDeclared $ 0.24us-gaap_CommonStockDividendsPerShareDeclared    
Subsequent event                          
Subsequent events                          
Cash dividends declared per common share (in dollars per share)                       $ 0.165us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Common stock repurchase authorized amount                         75us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Subsequent event | Maximum                          
Subsequent events                          
Common stock repurchase termination period                         6 months