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Stock-Based Compensation - Narrative (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 27, 2023 | Apr. 27, 2025 | Apr. 28, 2024 | Apr. 30, 2023 | Sep. 16, 2015
Time Based Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Remaining unrecognized compensation cost |  | $ 561,000 |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  | 1 year 4 months 24 days |  |  |
Fair value of units expected to vest |  | $ 1,000,000.0 |  |  |
Performance Based Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Remaining unrecognized compensation cost |  | $ 13,000 |  |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized |  | 1 year 2 months 12 days |  |  |
Fair value of units expected to vest |  | $ 16,000 |  |  |
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 |  | 644,000 | $ 823,000 | $ 808,000 |
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 |  | $ 6,000 | 8,000 | 2,000 |
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 |  |  | $ 84,000 | $ 335,000 |
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
Amended and Restated Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of common stock authorized for issuance additional | 960,000 |  |  |  |
Number of shares available for future equity based grants |  | 668,353 |  |  |

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