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Summary of Company's Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
4 Months Ended
Apr. 18, 2020
Apr. 20, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock-based compensation $ 3,894 $ 3,179
Performance Contingent Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock-based compensation 2,614 2,356
Time-Based Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock-based compensation 947 448
Deferred Stock    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock-based compensation $ 333 $ 375