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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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