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Commitments and contingencies - Narrative (Details) $ in Millions				3 Months Ended		12 Months Ended
	Mar. 16, 2020 USD ($) action	Aug. 01, 2016 plaintiff	Feb. 02, 2015 plaintiff	Aug. 01, 2020 USD ($)	Feb. 01, 2020 USD ($)	Jan. 29, 2022 USD ($) property lease	Jan. 30, 2021 USD ($)	Feb. 01, 2020 USD ($)
Loss Contingencies [Line Items]
Number of leases assigned | lease						11
Number of properties subleased | property						6
Capital commitments related to expansion and renovation of stores						$ 18.2	$ 0.0
Loss related to litigation settlement						1.7	7.5	$ 33.2
Environmental Protection Agency Collective Action
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff		9,124	70,000
S.D.N.Y. Cases
Loss Contingencies [Line Items]
Payments for legal settlements				$ 35.0
Litigation settlement, amount awarded to other party	$ 240.0
Shareholder Actions
Loss Contingencies [Line Items]
Loss related to litigation settlement						$ 1.7	$ 7.5
Loss contingency, new claims filed, number | action	4
Other Operating Income (Expense) | S.D.N.Y. Cases
Loss Contingencies [Line Items]
Loss related to litigation settlement					$ 33.2
Litigation administration costs					$ 0.6

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Number of Leases Assigned

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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The total number of new claims filed pertaining to a loss contingency during the period.

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