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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Dec. 28, 2014
Accounting Policies [Line Items]          
Reporting period, minimum     364 days    
Reporting period, maximum     371 days    
Recognized gift card breakage revenue $ 112 $ 109 $ 223 $ 217  
Estimated gift card redemption period          
Long-lived assets to be held and used $ 500   $ 500    
First Quarter [Member]          
Accounting Policies [Line Items]          
Interim reporting periods     91 days   91 days
Second Quarter [Member]          
Accounting Policies [Line Items]          
Interim reporting periods     91 days   91 days
Third Quarter [Member]          
Accounting Policies [Line Items]          
Interim reporting periods     91 days   91 days
Fourth Quarter [Member]          
Accounting Policies [Line Items]          
Interim reporting periods     98 days   91 days