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Shareholders' Equity - Summary of Stock Option Activity and Related Information for Stock Options Granted (Details) - Stock Options - $ / shares | 12 Months Ended
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Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
2010 Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Outstanding - beginning balance (in shares) | 72,000 | 197,332 | 242,667
Awarded (in shares) | 0 | 0 | 0
Exercised (in shares) | 0 | (125,332) | (18,668)
Cancelled (in shares) | 0 | 0 | (26,667)
Outstanding - ending balance (in shares) | 72,000 | 72,000 | 197,332
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) | $ 37.01 | $ 24.55 | $ 24.50
Wtd. Avg. Exercise Price, Awarded (in dollars per share) | 0 | 0 | 0.00
Wtd. Avg. Exercise Price, Exercised (in dollars per share) | 0.00 | 17.40 | 12.96
Wtd. Avg. Exercise Price, Cancelled (in dollars per share) | 0.00 | 0.00 | 32.07
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share) | $ 37.01 | $ 37.01 | $ 24.55
2007 Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Outstanding - beginning balance (in shares) | 57,169 | 79,666 | 108,000
Awarded (in shares) | 0 | 0 | 0
Exercised (in shares) | (13,333) | (22,497) | (28,334)
Cancelled (in shares) | (1,668) | 0 | 0
Outstanding - ending balance (in shares) | 42,168 | 57,169 | 79,666
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) | $ 31.82 | $ 28.91 | $ 24.21
Wtd. Avg. Exercise Price, Awarded (in dollars per share) | 0.00 | 0.00 | 0.00
Wtd. Avg. Exercise Price, Exercised (in dollars per share) | 24.67 | 21.52 | 10.99
Wtd. Avg. Exercise Price, Cancelled (in dollars per share) | 37.01 | 0.00 | 0.00
Wtd. Avg. Exercise Price, Outstanding - ending balance (in dollars per share) | $ 33.87 | $ 31.82 | $ 28.91

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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=96867065&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=96867065&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=96867065&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=96867065&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 FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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=84159872&loc=d3e21463-112644 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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 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=96867065&loc=d3e5070-113901 + Details
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