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Common Stock Repurchase Program (Detail) (USD $) | 12 Months Ended | 24 Months Ended | 12 Months Ended |  | 12 Months Ended
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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 + 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 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 + Details
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