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Dividend Program - Narrative (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 15, 2021 | May 02, 2021 | May 03, 2020 | Apr. 28, 2019
Dividends [Line Items] |  |  |  |
Cash dividends paid |  | $ 5,292 | $ 5,075 | $ 4,732
Quarterly Dividend [Member] |  |  |  |
Dividends [Line Items] |  |  |  |
Cash dividends paid |  | $ 5,300 | $ 5,100 | $ 4,700
Quarterly Dividend [Member] | Minimum [Member] |  |  |  |
Dividends [Line Items] |  |  |  |
Cash dividend payment, per share |  | $ 0.105 | $ 0.10 | $ 0.09
Quarterly Dividend [Member] | Maximum [Member] |  |  |  |
Dividends [Line Items] |  |  |  |
Cash dividend payment, per share |  | $ 0.11 | $ 0.105 | $ 0.10
Subsequent Event [Member] | Quarterly Dividend [Member] |  |  |  |
Dividends [Line Items] |  |  |  |
Cash dividend declared, per share | $ 0.11 |  |  |
Date of payment to shareholders entitled to dividends | Jul. 16, 2021 |  |  |
Date of record of shareholders entitled to dividends | Jul. 09, 2021 |  |  |

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