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Stock-Based Compensation - Plans and Expense (Details) - USD ($) $ in Thousands, shares in Millions | 12 Months Ended
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Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Stock-based compensation expense recognized for outstanding grants |  |  |
Equity-based awards expense | $ 9,474 | $ 8,864 | $ 8,292
Liability-based awards expense | 405 | 1,687 | 1,355
Total stock-based compensation expense | $ 9,879 | $ 10,551 | $ 9,647
2017 Omnibus Incentive Plan |  |  |
Stock-Based Compensation |  |  |
Aggregate number of common shares that may be issued through awards (in shares) | 5.9 |  |
2010 Omnibus Incentive Plan |  |  |
Stock-Based Compensation |  |  |
Aggregate number of common shares that may be issued through awards (in shares) | 0.0 |  |
Previous Plans |  |  |
Stock-Based Compensation |  |  |
Aggregate number of common shares that may be issued through awards (in shares) | 0.0 |  |

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- Definition Expense (income) recognized during the period for share-based compensation awards that are settled in cash. + References No definition available. + Details
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- Definition Expense recognized during the period for share-based compensation awards that are settled in stock. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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