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Shareholders' Equity - Summary of Stock Option Activity and Related Information for Stock Options Granted, Options Outstanding and Exercisable (Details) - Stock Options | 12 Months Ended
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Apr. 28, 2018 $ / shares shares
2010 Stock Plan | $37.01 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 72,000
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 37.01
Options outstanding - avg remaining life | 6 years 3 months 12 days
Options exercisable (in shares) | shares | 72,000
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 37.01
Options exercisable - avg. remaining life | 6 years 3 months 12 days
2007 Stock Plan |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 42,168
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 33.87
Options exercisable (in shares) | shares | 42,168
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 33.87
2007 Stock Plan | $10.55 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 5,000
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 10.55
Options outstanding - avg remaining life | 2 years 2 months 27 days
Options exercisable (in shares) | shares | 5,000
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 10.55
Options exercisable - avg. remaining life | 2 years 2 months 27 days
2007 Stock Plan | $17.27 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
Options outstanding (in shares) | shares | 37,168
Options outstanding - exercise price (in dollars per share) | $ / shares | $ 37.01
Options outstanding - avg remaining life | 6 years 3 months 12 days
Options exercisable (in shares) | shares | 37,168
Options exercisable - exercise price (in dollars per share) | $ / shares | $ 37.01
Options exercisable - avg. remaining life | 6 years 3 months 12 days

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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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