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Net Income Per Share - Weighted Average Number of Shares Outstanding (Detail) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 29, 2012	Jul. 31, 2011
Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items]
Weighted average common shares outstanding, basic	12,551	13,061
Dilutive effect of stock-based compensation	160	144
Weighted average common shares outstanding, diluted	12,711	13,205

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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