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Loans, overdrafts and long-term debt - Additional Information (Details) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 27, 2019 USD ($) | Aug. 01, 2020 USD ($) | Aug. 03, 2019 USD ($) | Aug. 01, 2020 USD ($) | Aug. 03, 2019 USD ($) | Feb. 01, 2020 USD ($) | May 19, 2014 USD ($)
Senior Unsecured Notes Due in 2024 | Senior Unsecured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of senior debt | $ 239,600,000 |  |  |  |  |  |
Redemption price per $1,000 of principal amount | 950.00 |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 1,000,000.0 | $ 3,400,000 | $ 1,000,000.0 | $ 3,400,000 | $ 1,100,000 |
Amortization of financing costs |  | 0.0 | $ 200,000 | 100,000 | $ 300,000 |  |
Senior Asset-Based Credit Facility | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized debt issuance costs |  | 7,800,000 |  | 7,800,000 |  | $ 8,700,000 |
Amortization of financing costs |  | 400,000 |  | 900,000 |  |  |
Debt issuance costs |  | 9,300,000 |  | 9,300,000 |  |  |
Signet UK Finance plc | Senior Unsecured Notes Due in 2024 | Senior Unsecured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 400,000,000
Stated interest rate |  |  |  |  |  |  | 4.70%
Revolving Credit Facility | Senior Asset-Based Credit Facility | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity | $ 1,500,000,000 |  |  |  |  |  |
Letters of credit outstanding |  | 14,900,000 |  | 14,900,000 |  |  |
Available borrowing capacity |  | 274,900,000 |  | $ 274,900,000 |  |  |
Debt instrument, covenant, minimum coverage ratio |  |  |  | 1.00 |  |  |
Debt covenant, fixed covenant ratio threshold |  | 140,000,000 |  | $ 140,000,000 |  |  |
Debt issuance costs |  | 8,700,000 |  | 8,700,000 |  |  |
Term Loan Facility | Senior Asset-Based Credit Facility | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount |  | 100,000,000.0 |  | 100,000,000.0 |  |  |
Debt issuance costs |  | $ 600,000 |  | $ 600,000 |  |  |

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