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Common Stock Repurchase Program (Detail) - USD ($) | 6 Months Ended |
--- | --- | ---
Oct. 28, 2018 | Oct. 29, 2017 | Jun. 15, 2016
Stockholders Equity Note [Line Items] |  |  |
Cost of common stock repurchase | $ 844,000 |  |
Common Stock [Member] |  |  |
Stockholders Equity Note [Line Items] |  |  |
Common stock repurchased | 36,880 |  |
Cost of common stock repurchase | $ 2,000 |  |
Common Stock Repurchase Program June 15, 2016 [Member] | Common Stock [Member] |  |  |
Stockholders Equity Note [Line Items] |  |  |
Authorization amount for repurchase of common stock |  |  | $ 5,000,000
Common stock repurchased | 36,880 | 0 |
Cost of common stock repurchase | $ 844,000 |  |
Remaining authorized repurchase amount | $ 4,200,000 |  |

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