Commitments and contingencies - Narrative (Details)					1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 16, 2020 USD ($)	Jan. 15, 2018 plaintiff	Jan. 14, 2018 plaintiff	Aug. 01, 2016 employee	Aug. 31, 2016 lawsuit	Aug. 01, 2020 USD ($)	Feb. 01, 2020 USD ($)	Jan. 30, 2021 USD ($) property employee lease settlement	Feb. 01, 2020 USD ($)	Feb. 02, 2019 USD ($) lawsuit
Loss Contingencies [Line Items]
Number of leases assigned | lease								17
Number of properties subleased | property								5
Capital commitments related to expansion and renovation of stores									$ 22,300,000
Loss related to litigation settlement								$ 7,500,000	$ 33,200,000	$ 0
Consumer Financial Protection Bureau
Loss Contingencies [Line Items]
Loss contingency, damages paid, value								10,000,000
New York Attorney General
Loss Contingencies [Line Items]
Loss contingency, damages paid, value								$ 1,000,000
Environmental Protection Agency Collective Action
Loss Contingencies [Line Items]
Number of plaintiffs		254	70,000	10,314				9,124
S.D.N.Y. Cases
Loss Contingencies [Line Items]
Loss contingency, new claims filed, number | lawsuit					2					4
Litigation settlement, amount awarded to other party	$ 240,000,000
Payments for legal settlements						$ 35,000,000
Shareholder Actions
Loss Contingencies [Line Items]
Loss related to litigation settlement								$ 7,500,000
Number of anticipated settlements | settlement								4
Other Operating Income (Expense) | S.D.N.Y. Cases
Loss Contingencies [Line Items]
Loss related to litigation settlement							$ 33,200,000
Litigation administration costs							600,000
Insurance recoveries							$ 207,400,000