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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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-Name Accounting Standards Codification



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-SubTopic 10



-Section S99



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