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Income Taxes - Allocation of Income Tax Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Apr. 29, 2018 | Jan. 28, 2018 | Oct. 29, 2017 | Jul. 30, 2017 | Apr. 30, 2017 | Jan. 29, 2017 | Oct. 30, 2016 | Jul. 31, 2016 | Apr. 29, 2018 | Apr. 30, 2017 | May 01, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
income from operations | $ (6,217) | $ 8,208 | $ 2,108 | $ 1,640 | $ 778 | $ 643 | $ 2,684 | $ 3,233 | $ 5,740 | $ 7,339 | $ 10,963
shareholders' equity, related to the tax benefit arising from stock based compensation |  |  |  |  |  |  |  |  |  | (657) | (841)
income tax expense (benefit), including tax effect from exercise of stock options and vesting of other stock-based compensation awards |  |  |  |  |  |  |  |  | $ 5,740 | $ 6,682 | $ 10,122

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations, including tax effect from exercise of stock options and vesting of other stock-based compensation awards. + References No definition available. + Details
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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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