Common Stock Repurchase Program (Detail) (USD $)	12 Months Ended	0 Months Ended	12 Months Ended	3 Months Ended
Apr. 28, 2013	Apr. 29, 2012	Apr. 28, 2013 common stock	Apr. 29, 2012 common stock	Apr. 29, 2012 Common Stock Repurchase Program June 2011 [Member] common stock	Aug. 29, 2011 Common Stock Repurchase Program August 2011 [Member] common stock	Apr. 29, 2012 Common Stock Repurchase Program August 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	Apr. 27, 2014 Common Stock Repurchase Program February 2014 [Member] common stock	Jul. 11, 2014 Common Stock Repurchase Program February 2014 [Member] common stock Subsequent Event [Member]
Stockholders Equity Note [Line Items]
Authorization amount for repurchase of common stock					$ 5,000,000		$ 7,000,000	$ 5,000,000	$ 2,000,000	$ 5,000,000
Additional authorization amount for repurchase of common stock						2,000,000
Common stock repurchased			502,595	624,127			624,127	502,595	0	0	22,101
Cost of common stock repurchased	$ 5,022,000	$ 5,384,000	$ 25,000	$ 31,000			$ 5,384,000	$ 5,022,000			$ 381,000

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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

+ Details

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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

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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