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Net Income Per Share - Narrative (Detail)	3 Months Ended		9 Months Ended
	Jan. 27, 2013	Jan. 29, 2012	Jan. 27, 2013	Jan. 29, 2012
Earnings Per Share Disclosure [Line Items]
Number of shares of common stock excluded from the computation of basic net income per share	123,335	185,000	123,335	185,000
Stock Option Awards [Member]
Earnings Per Share Disclosure [Line Items]
Number of common stock options excluded from the computation of diluted net income per share		142,750	2,000	142,750

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