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Stock Options and Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 26, 2015 | Apr. 30, 2022 | Apr. 30, 2021 | Aug. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Deferred income tax benefit |  | $ (121) | $ (242) |
Vesting period (in years) |  | 4 years |  |
Awards granted (in shares) |  | 0 | 0 |
Stock based compensation expense |  | $ 0 | $ 15 |
Deferred income tax benefit |  | $ 0 | 3 |
2010 and 2008 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future grants (in shares) |  | 0 |  |
2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for future grants (in shares) |  | 147,509 |  | 280,100
2017 Plan | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  | $ 701 | 578 |
Deferred income tax benefit |  | $ 165 | $ 136 |
Vesting period (in years) |  | 3 years |  |
Remaining estimated compensation expense |  | $ 760 |  |
2017 Plan | Service Components | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) |  | 2 years |  |
2017 Plan | Service Components | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) |  | 3 years |  |
2008 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized under stock option plan (in shares) |  | 300,000 |  |
Increase in number of shares available under stock option plan (in shares) | 300,000 |  |  |
Awards granted (in shares) |  | 0 |  |
2008 Plan | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Terms of award (in years) |  | 10 years |  |

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