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Common Stock Repurchase Program (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Aug. 01, 2021	Oct. 31, 2021	Nov. 01, 2020	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	73,002	48,686	121,688	0
Remaining authorized repurchase amount	$ 3,200,000		$ 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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The cash outflow to reacquire common stock during the period.

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