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Retirement Plans - Narrative (Details) £ in Millions, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 23, 2022 GBP (£) | Mar. 23, 2022 USD ($) | Aug. 04, 2021 GBP (£) | Aug. 04, 2021 USD ($) | Jul. 30, 2022 USD ($) | Apr. 30, 2022 USD ($) | Jul. 31, 2021 USD ($) | Jul. 30, 2022 USD ($) | Jul. 31, 2021 USD ($) | Jul. 30, 2022 GBP (£) | Jul. 30, 2022 USD ($) | Jul. 30, 2022 USD ($) | Jul. 29, 2021 employee
Defined Contribution Plan [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of pension scheme members | employee |  |  |  |  |  |  |  |  |  |  |  |  | 1,909
Pension scheme | Foreign Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax non-cash settlement charges | $ |  |  |  |  | $ 0.9 | $ 131.9 | $ 0.0 | $ 132.8 | $ 0.0 |  |  |  |
Signet Group Limited | Pension scheme |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions by employer |  |  |  |  |  |  |  |  |  | £ 14.0 | $ 18.9 |  |
Defined benefit plan, initial contribution amount |  |  | £ 7.0 | $ 9.7 |  |  |  |  |  |  |  |  |
Additional contribution amount | £ 7.0 | $ 9.2 |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan, expected future employer contributions, amount |  |  |  |  |  |  |  |  |  | £ 2.0 |  | $ 2.4 |

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