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Income Taxes (Details)
3 Months Ended 9 Months Ended 10 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
Income Taxes        
Effective income tax rate (as a percent) 169.50% 34.60% 92.80% 38.60%