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Common Stock Repurchase Program (Detail) (USD $)	12 Months Ended		24 Months Ended	12 Months Ended		12 Months Ended
	Apr. 28, 2013	Apr. 29, 2012	Apr. 28, 2013 common stock	Apr. 29, 2012 Common Stock Repurchase Program August 2011 [Member] common stock	Aug. 29, 2011 Common Stock Repurchase Program August 2011 [Member] common stock	Apr. 29, 2012 Common Stock Repurchase Program June 2011 [Member] common stock	Apr. 28, 2013 Common Stock Repurchase Program June 2012 [Member] common stock	Apr. 28, 2013 Common Stock Repurchase Program August 2012 [Member] common stock
Stockholders Equity Note [Line Items]
Authorization amount for repurchase of common stock				$ 7,000,000		$ 5,000,000	$ 5,000,000	$ 2,000,000
Additional authorization amount for repurchase of common stock					2,000,000
Common stock repurchased			1,100,000	624,127			502,595
Cost of common stock repurchased	$ 5,022,000	$ 5,384,000	$ 10,400,000	$ 5,384,000			$ 5,022,000

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- Definition

The additional amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

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- Definition

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

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