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Stock-Based Compensation (Deferred Stock) - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 13, 2019
Jul. 13, 2019
Dec. 29, 2018
Deferred stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares vested   66,000  
Deferred Stock Activity      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to nonvested restricted stock granted by the Omnibus Plan $ 0.9 $ 0.9  
Expected weighted-average period to recognize compensation cost (years)   10 months 13 days  
Intrinsic value of shares vested $ 1.4 $ 1.4  
Annual Grants | Deferred stock | Non Employee Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate shares elected to receive   46,240 65,000
Annual Grants | Deferred stock | Non Employee Directors | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period     1 year
Retainer Conversion      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Retainers conversion into deferred shares   100.00%  
Vesting period   1 year  
Previous Director Retainer Deferrals | Deferred stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares vested   5,180  
Common shares issued   5,180  
Director Retainer Deferrals | Omnibus Plan | Deferred stock | Non Employee Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate shares elected to receive   2,707