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Commitments and contingencies (Details) $ in Millions |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 17, 2020 claim | Mar. 16, 2020 action | Aug. 01, 2016 plaintiff | Feb. 02, 2015 plaintiff | Jan. 28, 2023 USD ($) | Aug. 01, 2020 USD ($) | Feb. 01, 2020 USD ($) | Jul. 29, 2023 USD ($) | Jan. 28, 2023 USD ($) | Jan. 29, 2022 USD ($) | Jan. 30, 2021 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Capital commitments related to expansion and renovation of stores |  |  |  |  | $ 107.0 |  |  |  | $ 107.0 | $ 18.2 |
Litigation settlement, expense |  |  |  |  |  |  |  |  | 203.8 | 1.7 | $ 7.5
Equal Pay Act Collective Action |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  |  | 9,124 | 70,000 |  |  |  |  |  |  |
Litigation settlement, expense |  |  |  |  |  |  |  |  | $ 187.9 |  |
Equal Pay Act Collective Action | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  |  |  |  |  |  |  | $ 175.0 |  |  |
Shareholder Actions |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for legal settlements |  |  |  |  |  | $ 35.0 |  |  |  |  |
Litigation settlement, expense |  |  |  |  |  |  |  |  |  | $ (1.7) | $ (7.5)
Insurance recoveries |  |  |  |  |  |  | $ 207.4 |  |  |  |
Litigation settlement, amount awarded to other party |  |  |  |  |  | $ 240.0 |  |  |  |  |
Loss contingency, new claims filed, number | 4 | 4 |  |  |  |  |  |  |  |  |
Other Matters |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, expense |  |  |  |  | $ 15.9 |  |  |  |  |  |
Other Operating Income (Expense) | Shareholder Actions |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, expense |  |  |  |  |  |  | (33.2) |  |  |  |
Litigation administration costs |  |  |  |  |  |  | $ 0.6 |  |  |  |

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