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Stock-Based Compensation - Narrative (Detail) - USD ($)		12 Months Ended
	Sep. 27, 2023	Apr. 28, 2024	Apr. 30, 2023	May 01, 2022	Sep. 16, 2015
Time Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unrecognized compensation cost		$ 876,000
Weighted average period over which unrecognized compensation cost is expected to be recognized		1 year 7 months 6 days
Fair value of units expected to vest		$ 1,400,000
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		823,000	$ 808,000	$ 893,000
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		8,000	2,000	(81,000)
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	$ 321,000
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		976,008

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