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Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Oct. 28, 2017 | Oct. 29, 2016 | Oct. 28, 2017 | Oct. 29, 2016
Stock-based compensation expense recognized for outstanding grants |  |  |  |
Equity-based awards expense | $ 2,852 | $ 2,551 | $ 6,410 | $ 5,880
Liability-based awards (income) expense | (588) | (1,229) | 308 | 270
Total stock-based compensation expense | $ 2,264 | $ 1,322 | $ 6,718 | $ 6,150

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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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