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Stock-Based Compensation - Narrative (Detail) - USD ($) | 12 Months Ended |
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Apr. 30, 2023 | May 01, 2022 | May 02, 2021 | Sep. 16, 2015
Time Based Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Remaining unrecognized compensation cost | $ 759,000 |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year 6 months |  |  |
Fair value of units expected to vest | $ 1,600,000 |  |  |
Selling, General and Administrative Expenses [Member] | Time Based Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 808,000 | $ 893,000 | $ 614,000 |
Selling, General and Administrative Expenses [Member] | Performance Based Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | 2,000 | (81,000) | 357,000 |
Selling, General and Administrative Expenses [Member] | Common Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense | $ 335,000 | $ 321,000 | $ 280,000 |
2015 Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of common stock authorized for issuance |  |  |  | 1,200,000
Number of shares available for future equity based grants | 224,266 |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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