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Dividend Program (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 13, 2017 | Apr. 30, 2017 | Jan. 29, 2017 | Oct. 30, 2016 | Jul. 31, 2016 | May 01, 2016 | Jan. 31, 2016 | Nov. 01, 2015 | Aug. 02, 2015 | Aug. 03, 2014 | Apr. 30, 2017 | May 01, 2016 | May 03, 2015
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  | $ 988 | $ 985 | $ 862 | $ 3,445 | $ 859 | $ 864 | $ 741 | $ 5,676 |  | $ 6,280 | $ 8,140 | $ 7,579
Cash dividend payment, per share |  | $ 0.08 | $ 0.08 | $ 0.07 | $ 0.28 | $ 0.07 | $ 0.07 | $ 0.06 | $ 0.46 |  |  |  |
Special Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  | $ 2,600 |  |  |  | $ 5,000 | $ 4,900 |  |  |
Cash dividend payment, per share |  |  |  |  | $ 0.21 |  |  |  | $ 0.40 | $ 0.40 |  |  |
Quarterly Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid |  |  |  |  |  |  |  |  |  |  | $ 3,700 | $ 3,100 | $ 2,700
Quarterly Dividend [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend payment, per share |  |  |  |  |  |  |  |  |  |  | $ 0.07 | $ 0.06 | $ 0.05
Quarterly Dividend [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend payment, per share |  |  |  |  |  |  |  |  |  |  | $ 0.08 | $ 0.07 | $ 0.06
Subsequent Event [Member] | Special Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared, per share | $ 0.21 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | 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 |  |  |  |  |  |  |  |  |  |  |  |

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