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Shareholders' Equity - Summary of Stock Option Activity and Related Information for Stock Options Granted (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
May. 02, 2015 | May. 03, 2014 | Apr. 27, 2013 | Apr. 28, 2012
2010 Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Awarded (in shares) | 108,000 | 120,000 | 120,000 |
2010 Stock Plan | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Outstanding - beginning balance (in shares) | 420,001 | 360,000 | 240,000 |
Awarded (in shares) | 108,000 | 120,000 | 120,000 |
Exercised (in shares) | (285,334) | (59,999) | 0 |
Cancelled (in shares) | 0 | 0 | 0 |
Outstanding - ending balance (in shares) | 242,667 | 420,001 | 360,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Wtd. Avg. Exercise Price, Outstanding - beginning balance (in dollars per share) | $ 11.74 | $ 9.53 | $ 9.97 |
Wtd. Avg. Exercise Price, Awarded (in dollars per share) | 37.01 | 17.27 | 8.64 |
Wtd. Avg. Exercise Price, Exercised (in dollars per share) | 10.47 | 9.50 | 0.00 |
Wtd. Avg. Exercise Price, Cancelled (in dollars per share) | 0.00 | 0.00 | 0.00 |
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share) | $ 24.49 | $ 11.74 | $ 9.53 |
2007 Stock Plan | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Outstanding - beginning balance (in shares) | 172,359 | 778,000 | 738,000 |
Awarded (in shares) | 50,500 | 42,500 | 42,500 |
Exercised (in shares) | (114,859) | (648,141) | (2,500) |
Cancelled (in shares) |  | 0 |  |
Outstanding - ending balance (in shares) | 108,000 | 172,359 | 778,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Wtd. Avg. Exercise Price, Outstanding - beginning balance (in dollars per share) | $ 10.02 | $ 5.94 | $ 5.79 |
Wtd. Avg. Exercise Price, Awarded (in dollars per share) | 37.01 | 17.27 | 8.64 |
Wtd. Avg. Exercise Price, Exercised (in dollars per share) | 8.55 | 5.60 | 8.10 |
Wtd. Avg. Exercise Price, Cancelled (in dollars per share) |  | 0.00 |  |
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share) | $ 24.21 | $ 10.02 | $ 5.94 |
2000 and 2004 Stock Plans | Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Outstanding - beginning balance (in shares) | 0 | 72,585 | 251,365 |
Awarded (in shares) |  | 0 | 0 |
Exercised (in shares) |  | (71,175) | (50,675) |
Cancelled (in shares) |  | (1,410) | (128,105) |
Outstanding - ending balance (in shares) |  | 0 | 72,585 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Wtd. Avg. Exercise Price, Outstanding - beginning balance (in dollars per share) | $ 0.00 | $ 11.44 | $ 10.96 |
Wtd. Avg. Exercise Price, Awarded (in dollars per share) |  | 0.00 | 0.00 |
Wtd. Avg. Exercise Price, Exercised (in dollars per share) |  | 11.44 | 11.44 |
Wtd. Avg. Exercise Price, Cancelled (in dollars per share) |  | 11.44 | 10.50 |
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share) |  | $ 0.00 | $ 11.44 |
Exercisable options (in shares) |  | 0 | 72,585 | 251,365
Wtd. Avg. Exercise Price - Exercisable options (in dollars per share) |  | $ 0.00 | $ 11.44 | $ 10.96

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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