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Income taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Jan. 30, 2021 | Feb. 01, 2020 | Feb. 02, 2019 | Feb. 03, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |
Statutory tax rate (percent) | 21.00% | 21.00% | 21.00% |
Income tax benefit, two year carryforward | $ 74.0 |  |  |
Income tax benefit, five year carryforward | 26.4 |  |  |
Valuation allowance | 83.9 | $ 38.4 |  |
Capital loss carryforwards | 13.9 | 12.9 |  |
Increase in valuation allowance | 45.5 |  |  |
Unrecognized tax benefits | 25.4 | 23.5 | $ 18.1 | $ 12.0
Accrued interest related to unrecognized tax benefits | 4.1 |  |  |
Accrued penalties | 0.6 |  |  |
Increase resulting from settlements with taxing authorities | 23.3 |  |  |
State and Local Jurisdiction |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance | 50.0 |  |  |
Domestic Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carry forwards | 29.5 |  |  |
Capital loss carryforwards | 2.7 |  |  |
Internal Revenue Service (IRS) |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carry forwards | 11.5 |  |  |
Foreign Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating loss carry forwards | 18.3 |  |  |
Deferred tax assets | 8.7 |  |  |
Foreign capital loss carry forward | $ 11.2 | $ 10.5 |  |
Bermuda |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Statutory tax rate (percent) | 0.00% |  |  |

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