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Common Stock Repurchase Program (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2023	May 01, 2022	May 02, 2021	Mar. 31, 2020
Stockholders Equity Note [Line Items]
Cost of common stock repurchase		$ 1,752,000
Common Stock [Member]
Stockholders Equity Note [Line Items]
Common stock repurchased	0	121,688	0
Cost of common stock repurchase		$ 6,000
Remaining authorized repurchase amount	$ 3,200,000
Stock Repurchase Program March 2020 [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Authorization amount for repurchase of common stock				$ 5,000,000.0

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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