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Earnings per share (Details Textual)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2013
Sep. 23, 2012
Sep. 29, 2013
Sep. 23, 2012
Earnings Per Share (Textual) [Abstract]        
Diluted earnings per share amounts excluded stock options outstanding 6.1 13.7 6.1 15.4