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Vesting Time-Based Restricted Stock Units (Detail) - USD ($)
$ in Thousands
4 Months Ended
Apr. 18, 2020
Apr. 20, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividends at Vesting $ 87 $ 1,233
Time-Based Restricted Stock Units | Fiscal Year Vested 2020    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividends at Vesting 55  
Income tax expense related to share-based payments 57  
Fair Value at Vesting $ 1,831