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Net Income Per Share - Narrative (Detail)	3 Months Ended
	Jul. 29, 2012	Jul. 31, 2011
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
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		24,750

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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