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Income taxes - Narrative (Details) $ in Millions	3 Months Ended
	Aug. 01, 2020 USD ($)
Income Tax Disclosure [Abstract]
CARES Act, income tax benefit on Tax Cuts and Jobs Act	$ 67.5
CARES Act, income tax benefit on net operating losses	39.0
Increase in valuation allowance	$ 56.7

X

- Definition

CARES Act, Income Tax Expense (Benefit) on Net Operating Losses

+ References

No definition available.

+ Details

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X

- Definition

CARES Act, Income Tax Expense (Benefit) on Tax Cuts and Jobs Act

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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