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Income Taxes (Details)
3 Months Ended 6 Months Ended 7 Months Ended
Jun. 30, 2012
Jul. 02, 2011
Jun. 30, 2012
Jul. 02, 2011
Income Taxes        
Effective income tax rate (as a percent) 71.30% 40.30% 79.70% 40.30%