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Stock-Based Compensation (Deferred Stock) - Additional Information (Detail) - shares | 4 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 18, 2020 | Jul. 11, 2020 | Dec. 27, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Deferred Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common shares vested | 2,707 | 49,000 |  |  |
Common shares issued | 2,707 |  |  |  |
Annual Grants | Deferred Stock | Non Employee Directors |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate shares elected to receive |  | 15,979 |  | 46,240 |
Common shares issued |  |  |  | 17,340 |
Annual Grants | Deferred Stock | Non Employee Directors | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period |  |  |  |  | 1 year
Annual Grants | Deferred Stock | Non Employee Directors | Scenario Forecast |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate shares elected to receive |  |  | 39,900 |  |
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 | Scenario Forecast |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Aggregate shares elected to receive |  |  | 2,299 |  |

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