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Dividend Program (Detail) - USD ($) |  |  | 3 Months Ended
--- | --- | --- | ---
Aug. 30, 2017 | Jun. 13, 2017 | Jul. 30, 2017 | Jul. 31, 2016
Dividends [Line Items] |  |  |  |
Cash dividends paid |  |  | $ 3,608,000 | $ 3,445,000
Special Dividend [Member] |  |  |  |
Dividends [Line Items] |  |  |  |
Cash dividend declared, per share |  | $ 0.21 |  |
Cash dividends paid |  |  | $ 2,600,000 | $ 2,500,000
Cash dividend payment, per share |  |  | $ 0.21 | $ 0.21
Quarterly Dividend [Member] |  |  |  |
Dividends [Line Items] |  |  |  |
Cash dividend declared, per share |  | $ 0.08 |  |
Date of payment to shareholders entitled to dividends |  | Jul. 17, 2017 |  |
Date of record of shareholders entitled to dividends |  | Jul. 03, 2017 |  |
Cash dividends paid |  |  | $ 1,000,000 | $ 861,000
Cash dividend payment, per share |  |  | $ 0.08 | $ 0.07
Subsequent Event [Member] | Quarterly Dividend [Member] |  |  |  |
Dividends [Line Items] |  |  |  |
Cash dividend declared, per share | $ 0.08 |  |  |
Date of payment to shareholders entitled to dividends | Oct. 16, 2017 |  |  |
Date of record of shareholders entitled to dividends | Oct. 02, 2017 |  |  |

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