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Retirement plans - Narrative (Details) £ in Millions, $ in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 06, 2023 GBP (£) | Jan. 06, 2023 USD ($) | Mar. 23, 2022 GBP (£) | Mar. 23, 2022 USD ($) | Aug. 09, 2021 GBP (£) | Aug. 09, 2021 USD ($) | Jul. 29, 2021 GBP (£) employee | Jul. 29, 2021 USD ($) employee | Jan. 28, 2023 USD ($) plan | Jul. 30, 2022 USD ($) | Apr. 30, 2022 USD ($) | Jan. 28, 2023 USD ($) plan | Jan. 29, 2022 USD ($) | Jan. 30, 2021 USD ($) | Jan. 28, 2023 GBP (£) | Jan. 28, 2023 USD ($) plan
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pension scheme members | employee |  |  |  |  |  |  | 1,909 | 1,909 |  |  |  |  |  |  |  |
Deferred compensation plan assets |  |  |  |  |  |  |  |  | $ 22.3 |  |  | $ 22.3 | $ 22.7 |  |  | $ 22.3
Liability, defined contribution plan |  |  |  |  |  |  |  |  | 33.9 |  |  | 33.9 | 32.4 |  |  | 33.9
Life Insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan assets |  |  |  |  |  |  |  |  | $ 5.5 |  |  | 5.5 | 6.0 |  |  | $ 5.5
Pension plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer discretionary contribution amount |  |  |  |  |  |  |  |  |  |  |  | $ 12.6 | 13.0 | $ 3.2 |  |
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 |  |  | 2 |  |  |  | 2
Cost recognized |  |  |  |  |  |  |  |  |  |  |  | $ 1.7 | 2.2 | 0.8 |  |
Pension plan | Foreign Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contributions |  |  |  |  |  |  |  |  |  |  |  | 10.4 | 12.4 |  |  |
Actuarial (gain) loss |  |  |  |  |  |  |  |  |  |  |  | (29.5) | 67.4 |  |  |
Pension settlement loss |  |  |  |  |  |  |  |  | $ (0.9) | $ (0.9) | $ (131.9) | (133.7) | 0.0 | 0.0 |  |
Accumulated benefit obligation |  |  |  |  |  |  |  |  | 1.6 |  |  | 1.6 | 303.3 |  |  | $ 1.6
Employer discretionary contribution amount |  |  |  |  |  |  |  |  |  |  |  | 2.5 | $ 2.4 | $ 2.4 |  |
Pension plan | Foreign Plan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated future employer contributions in next fiscal year |  |  |  |  |  |  |  |  | $ 1.0 |  |  | $ 1.0 |  |  |  | 1.0
Pension plan | Signet Group Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employer contributions | £ 1.0 | $ 1.2 | £ 7.0 | $ 9.2 |  |  | £ 7.0 | $ 9.7 |  |  |  |  |  |  | £ 15.0 | $ 20.1
Actuarial (gain) loss |  |  |  |  | £ 53.3 | $ 72.9 |  |  |  |  |  |  |  |  |  |

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