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Vesting Time-Based Restricted Stock Units (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 17, 2021
Jul. 11, 2020
Jul. 17, 2021
Jul. 11, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Dividends at Vesting $ 71 $ 22 $ 234 $ 109
Fiscal Year Vested 2021 | 2020 Award Granted        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Dividends at Vesting     53  
Tax Benefit     16  
Fair Value at Vesting     1,520  
Fiscal Year Vested 2021 | 2019 Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Dividends at Vesting     107  
Tax Benefit     77  
Fair Value at Vesting     1,582  
Fiscal Year Vested 2020 | 2019 Award        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Dividends at Vesting     55  
Tax Benefit     57  
Fair Value at Vesting     $ 1,831