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Cash Flow Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Apr. 28, 2013 | Apr. 29, 2012 | May 01, 2011
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Value of shares of common stock surrendered to satisfy withholding tax liabilities and the cost of stock options exercised |  |  | $ 563
Number of options exercised | 23,025 | 59,400 | 229,974
Performance Based Restricted Stock Units Vested And Stock Options Exercised During Period [Member] |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Number of shares of common stock surrendered to satisfy withholding tax liabilities and the cost of stock options exercised |  |  | 60,415
Value of shares of common stock surrendered to satisfy withholding tax liabilities and the cost of stock options exercised |  |  | $ 563
Stock Options [Member] |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Number of options exercised |  |  | 110,500
Performance Based Restricted Stock Units [Member] |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |
Number of units vested |  |  | 40,000

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- Definition The number of shares surrendered by grantees and canceled by the company upon exercise of stock options to pay the company for (a) the contractual purchase price to acquire the shares and (b) the requisite withholding taxes on taxable compensation arising from the exercises. + References No definition available. + Details
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- Definition The value of shares surrendered by grantees and canceled by the company upon exercise of stock options to pay the company for (a) the contractual purchase price to acquire the shares, and (b) the requisite withholding taxes on taxable compensation arising from the exercises. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share options (or share units) exercised during the current 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 FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: 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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