Income Taxes [Line Items]

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- Definition

Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

+ References

No definition available.

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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.

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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.

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- Definition

Amount of reasonable estimate for income tax expense from write-off and establishment of valuation allowance against unused foreign tax credits pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

+ References

No definition available.

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- Definition

The period over which transition tax pursuant to Tax Cuts and Jobs Act of 2017 may be elected to be paid.

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No definition available.

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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

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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%