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Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jan. 27, 2018 | Jan. 28, 2017 | Jan. 27, 2018 | Jan. 28, 2017
Stock-based compensation expense recognized for outstanding grants |  |  |  |
Equity-based awards expense | $ 1,519 | $ 1,691 | $ 7,929 | $ 7,571
Liability-based awards expense | 386 | 1,383 | 694 | 1,653
Total stock-based compensation expense | $ 1,905 | $ 3,074 | $ 8,623 | $ 9,224

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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=6415400&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=6415400&loc=d3e5070-113901 + Details
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