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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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