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Stock Options and Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 26, 2015 | Apr. 30, 2021 | Apr. 30, 2020 | Aug. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Deferred income tax benefit |  | $ (242) | $ (2,431) |
Vesting period (in years) |  | 4 years |  |
Awards granted (in shares) |  | 0 | 0 |
Stock based compensation expense |  | $ 15 | $ 58 |
Deferred income tax benefit |  | $ 3 | 14 |
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) |  | 167,136 |  | 280,100
2017 Plan | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  | $ 578 | 152 |
Deferred income tax benefit |  | $ 136 | $ 36 |
Vesting period (in years) |  | 3 years |  |
Remaining estimated compensation expense |  | $ 669 |  |
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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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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