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Income Taxes - Unrecognized Tax Benefit (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Apr. 30, 2017 | Jan. 29, 2017 | Apr. 30, 2017
Income Tax Disclosure [Abstract] |  |  |
Reduction to unrecognized tax benefits resulting from a lapse of the applicable statute of limitations | $ 1,300 | $ 2,100 | $ 3,431

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- Definition Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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