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Stock-Based Compensation (Deferred Stock) - Additional Information (Detail) - shares
4 Months Ended 9 Months Ended 12 Months Ended
Apr. 18, 2020
Oct. 05, 2019
Dec. 29, 2018
Deferred Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares vested 2,000    
Annual Grants | Deferred Stock | Non Employee Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate shares elected to receive 6,934 46,240  
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 4,660    
Common shares issued 4,660    
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 2,299