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Loans, overdrafts and long-term debt - Narrative (Details) - USD ($) | Sep. 05, 2019 | Apr. 29, 2023 | Jan. 28, 2023 | Apr. 30, 2022 | Jul. 28, 2021 | Sep. 27, 2019 | Sep. 06, 2019 | May 19, 2014
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Senior Unsecured Notes Due in 2024 | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 147,800,000 |
Repayments of senior debt | $ 239,600,000 |  |  |  |  |  |  |
Redemption price per $1,000 of principal amount | $ 950.00 |  |  |  |  |  |  |
Senior Unsecured Notes Due in 2024 | Senior Notes | Signet UK Finance plc |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 400,000,000
Stated interest rate |  |  |  |  |  |  |  | 4.70%
Senior Asset-Based Credit Facility | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 1,500,000,000 |  |
Additional borrowing capacity |  |  |  |  | $ 600,000,000 |  |  |
Long-term debt |  | $ 0 | $ 0 | $ 0 |  |  |  |
Available borrowing capacity |  | $ 1,300,000,000 |  |  |  |  |  |
Senior Asset-Based Credit Facility | Line of Credit | Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 100,000,000 |  |

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