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Retirement plans - Additional Information (Details) £ in Millions, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 09, 2021 GBP (£) | Aug. 09, 2021 USD ($) | Jul. 29, 2021 GBP (£) employee | Jul. 29, 2021 USD ($) employee | Jan. 29, 2022 USD ($) plan | Jan. 30, 2021 USD ($) | Feb. 01, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Number of pension scheme members | employee |  |  | 1,909 | 1,909 |  |  |
Defined contribution plan, plan assets, amount |  |  |  |  | $ 22.7 | $ 21.7 |
Liability, defined contribution plan |  |  |  |  | 32.4 | 33.3 |
Life Insurance |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined contribution plan, plan assets, amount |  |  |  |  | 6.0 | 6.3 |
Pension plan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Employer discretionary contribution amount |  |  |  |  | $ 13.0 | 3.2 | $ 9.1
Employer matching contribution, percent of match |  |  |  |  | 50.00% |  |
Employer matching contribution, maximum, percent of employees' gross pay |  |  |  |  | 6.00% |  |
Number of US non-qualified deferred compensation plans | plan |  |  |  |  | 2 |  |
Cost recognized |  |  |  |  | $ 2.2 | 0.8 | 3.6
Foreign Plan | Pension plan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Actuarial loss |  |  |  |  | 67.4 | 1.4 |
Future amortization of gain (loss) |  |  |  |  | (3.7) |  |
Future amortization of prior service cost |  |  |  |  | 0.3 |  |
Accumulated benefit obligation |  |  |  |  | 303.3 | 247.6 |
Employer contributions |  |  |  |  | 12.4 | 4.4 |
Employer discretionary contribution amount |  |  |  |  | $ 2.4 | $ 2.4 | $ 2.4
Foreign Plan | Pension plan | NAV | Fixed income |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Period of delay due to certain restrictions on withdrawals |  |  |  |  | 16 months |  |
Foreign Plan | Pension plan | Maximum |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Estimated future employer contributions in next fiscal year |  |  |  |  | $ 10.0 |  |
Signet Group Limited | Pension plan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined benefit plan, expected future employer contributions, amount |  |  | £ 16.9 | $ 22.6 |  |  |
Defined benefit plan, initial contribution amount |  |  | £ 7.0 | $ 9.7 |  |  |
Actuarial loss | £ 53.3 | $ 72.9 |  |  |  |  |

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