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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 09, 2012
Sep. 09, 2012
Store
Sep. 11, 2011
Income Taxes [Line Items]      
Tax benefit to reflect increased tax basis in certain assets due to issuance of final tax regulations $ 0.7    
Number of remaining company-owned stores sold   6  
Deferred tax asset, valuation allowance 0.9 0.9  
Decrease in liability for unrecognized tax benefits related to state income tax     0.5
Decrease in gross unrecognized tax benefits     0.3
Decrease in liability for unrecognized tax benefits related to interest     0.2
Recognized income tax benefit     $ 0.2