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Dividend Program (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 18, 2015 | May. 03, 2015 | Feb. 01, 2015 | Nov. 02, 2014 | Aug. 03, 2014 | Apr. 27, 2014 | Jan. 26, 2014 | Oct. 27, 2013 | Jul. 28, 2013 | May. 03, 2015 | Apr. 27, 2014 | Apr. 28, 2013
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend payment, per share |  | $ 0.06 | $ 0.06 | $ 0.05 | $ 0.45 | $ 0.05 | $ 0.05 | $ 0.04 | $ 0.04 |  |  |
Cash dividends paid |  | $ 733 | $ 733 | $ 611 | $ 5,502 | $ 612 | $ 613 | $ 490 | $ 489 | $ 7,579 | $ 2,204 | $ 7,593
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of payment to shareholders entitled to dividends | Jul. 15, 2015 |  |  |  |  |  |  |  |  |  |  |
Date of record of shareholders entitled to dividends | Jul. 01, 2015 |  |  |  |  |  |  |  |  |  |  |
Special Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend payment, per share |  |  |  |  | $ 0.40 |  |  |  |  |  |  | $ 0.50
Cash dividends paid |  |  |  |  | $ 4,900 |  |  |  |  |  |  | $ 6,100
Special Dividend [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared, per share | $ 0.40 |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividend [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend payment, per share |  |  |  |  |  |  |  |  |  |  |  | $ 0.03
Cash dividends paid |  |  |  |  |  |  |  |  |  | $ 2,700 | $ 2,200 | $ 1,500
Quarterly Dividend [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared, per share | $ 0.06 |  |  |  |  |  |  |  |  |  |  |
Quarterly Dividend [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend payment, per share |  |  |  |  |  |  |  |  |  | $ 0.05 | $ 0.04 |
Quarterly Dividend [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend payment, per share |  |  |  |  |  |  |  |  |  | $ 0.06 | $ 0.05 |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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