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Common Stock Repurchase Program (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
May 03, 2020 | Apr. 28, 2019 | May 02, 2021 | Mar. 31, 2020
Stockholders Equity Note [Line Items] |  |  |  |
Cost of common stock repurchase | $ 1,680,000 | $ 3,323,000 |  |
Common Stock [Member] |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Common stock repurchased | 142,496 | 160,823 |  |
Cost of common stock repurchase | $ 7,000 | $ 8,000 |  |
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
Remaining authorized repurchase amount |  |  | $ 5,000,000.0 |
Stock Repurchase Program September 5, 2019 [Member] | Common Stock [Member] |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Common stock repurchased | 142,496 |  |  |
Cost of common stock repurchase | $ 1,700,000 |  |  |
Stock Repurchase Program June 15, 2016 [Member] | Common Stock [Member] |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Common stock repurchased |  | 160,823 |  |
Cost of common stock repurchase |  | $ 3,300,000 |  |

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