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Income Taxes - 2017 Tax Cuts and Jobs Act - Narrative (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 28, 2018 | Jan. 28, 2018 | Jan. 29, 2017 | Apr. 28, 2019 | Apr. 29, 2018
Income Taxes [Line Items] |  |  |  |  |
Federal statutory income tax rate |  | 30.40% | 34.00% |  |
Provisional charge for re-measurement of U.S. net deferred income taxes | $ 1.3 | $ 1.3 |  |  |
Provisional net charge for income tax effects of the Transition Tax | 4.8 | 4.8 |  |  |
Provisional charge for write-off and establishment of valuation allowance against unused foreign tax credits | 25.8 | 25.8 |  |  |
Provisional benefit for release of deferred income tax liabilities related to earnings and profits not permanently reinvested | $ 21.0 | $ 21.0 |  |  |
Transition Tax payable period |  | 8 years |  |  |
Scenario, Forecast [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Federal statutory income tax rate |  |  |  | 21.00% | 30.40%

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- Definition Amount of reasonable estimate for income tax benefit from release of deferred income tax liabilities related to earnings and profits not permanently reinvested pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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