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Net Income Per Share - Weighted Average Shares (Detail) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Apr. 28, 2013	Jan. 27, 2013	Oct. 28, 2012	Jul. 29, 2012	Apr. 29, 2012	Jan. 29, 2012	Oct. 30, 2011	Jul. 31, 2011	Apr. 28, 2013	Apr. 29, 2012	May 01, 2011
Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items]
weighted-average common shares outstanding, basic	12,102	12,095	12,191	12,551	12,513	12,536	12,733	13,061	12,235	12,711	12,959
dilutive effect of stock-based compensation									215	155	259
weighted-average common shares outstanding, diluted	12,323	12,290	12,348	12,711	12,695	12,677	12,871	13,205	12,450	12,866	13,218

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 260

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