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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 28, 2013
Mar. 29, 2012
Dec. 27, 2012
Income Tax Disclosure [Abstract]      
Provision for income taxes $ 0.5 $ 1.5  
Effective tax rates (as a percent) 41.70% 38.50%  
Valuation allowance against deferred tax assets $ 2.4   $ 2.4