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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 |  |  |

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