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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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