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Common Stock Repurchase Program (Detail) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 02, 2014 | May. 03, 2015 | Apr. 27, 2014 | Apr. 28, 2013 | Apr. 29, 2012
Stockholders Equity Note [Line Items] |  |  |  |  |
Common stock repurchased | 43,014 |  |  |  |
Cost of common stock repurchased | $ 745,000 | $ 745,000 |  | $ 5,022,000 |
common stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Common stock repurchased |  | 43,014 |  | 502,595 |
Cost of common stock repurchased |  | $ 2,000 |  | $ 25,000 |
Remaining authorized repurchase amount |  | $ 4,300,000 |  |  |
Common Stock Repurchase Program June 13, 2012 [Member] | common stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Authorization amount for repurchase of common stock |  |  |  | $ 5,000,000 |
Common stock repurchased |  |  |  | 502,595 |
Cost of common stock repurchased |  |  |  | $ 5,000,000 |
Common Stock Repurchase Program Fiscal 2012 [Member] | common stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Authorization amount for repurchase of common stock |  |  |  |  | $ 7,000,000
Cost of common stock repurchased |  |  |  |  | $ 5,400,000
Common Stock Repurchase Program August 29, 2012 [Member] | common stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Authorization amount for repurchase of common stock |  |  |  | $ 2,000,000 |
Common stock repurchased |  |  |  | 0 |
Common Stock Repurchase Program February 25, 2014 [Member] | common stock |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Authorization amount for repurchase of common stock |  |  | $ 5,000,000 |  |
Common stock repurchased |  |  | 0 |  |

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- Definition Amount of stock repurchase plan authorized. + 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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 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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