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Loans, Overdrafts and Long-Term Debt - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 19, 2014 USD ($) | May 15, 2014 USD ($) | Feb. 03, 2018 USD ($) | Oct. 28, 2017 USD ($) | Feb. 03, 2018 USD ($) | Jan. 28, 2017 USD ($) | Jan. 30, 2016 USD ($) | Sep. 12, 2017 USD ($) | Jul. 29, 2017 USD ($) | Apr. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amortization related to capitalized fees |  |  |  |  | $ 3,700,000 | $ 2,800,000 | $ 3,600,000 |  |  |
Payment of debt issuance costs |  |  |  |  | 1,400,000 | 2,700,000 | 0 |  |  |
Bank overdrafts |  |  | $ 14,200,000 |  | 14,200,000 | 14,200,000 |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  |  | 350,000,000 | 0 | $ 0 |  |  |
Senior Unsecured Notes Due in 2024 | Signet UK Finance plc |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized fees |  |  | 7,000,000 |  | 7,000,000 |  |  |  |  |
Capitalized issuance costs written off |  |  | 2,600,000 |  | 2,600,000 | 1,900,000 |  |  |  |
Amortization related to capitalized fees |  |  |  |  | 700,000 | 700,000 |  |  |  |
Face amount | $ 400,000,000 |  |  |  |  |  |  |  |  |
Stated interest rate | 4.70% |  |  |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs | $ 393,900,000 |  |  |  |  |  |  |  |  |
Bridge Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payment of debt issuance costs |  |  |  | $ 1,400,000 |  |  |  |  |  |
Interest expense, debt |  |  |  | $ 900,000 |  |  |  |  |  |
Bridge Loan | R2Net Inc. |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  |  |  | $ 350,000,000 |  |
Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 700,000,000 | $ 400,000,000
Capitalized fees, current |  |  | 1,400,000 |  | 1,400,000 |  |  |  |  |
Capitalized fees |  |  | 2,600,000 |  | 2,600,000 |  |  |  |  |
Capitalized issuance costs written off |  |  | 1,200,000 |  | 1,200,000 | 800,000 |  |  |  |
Amortization related to capitalized fees |  |  |  |  | 400,000 | 400,000 |  |  |  |
Stand-by letters of credit |  |  | $ 15,700,000 |  | $ 15,700,000 | $ 15,300,000 |  |  |  |
Weighted average interest rate |  |  | 2.46% |  | 2.46% | 1.71% |  |  |  |
Covenant, maximum leverage ratio |  |  |  |  | 2.50 |  |  |  |  |
Covenant, minimum coverage ratio |  |  |  |  | 1.40 |  |  |  |  |
Credit Facility | Term Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized fees, current |  |  | $ 700,000 |  | $ 700,000 |  |  |  |  |
Capitalized fees |  |  | 6,200,000 |  | 6,200,000 |  |  |  |  |
Capitalized issuance costs written off |  |  | $ 3,500,000 |  | 3,500,000 | $ 2,700,000 |  |  |  |
Amortization related to capitalized fees |  |  |  |  | $ 800,000 | $ 900,000 |  |  |  |
Weighted average interest rate |  |  | 2.42% |  | 2.42% | 1.78% |  |  |  |
Face amount |  |  | $ 357,500,000.0 |  | $ 357,500,000.0 |  |  |  |  |
Credit Facility | Term Loan | Year One |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Quarterly repayment rate |  |  | 5.00% |  | 5.00% |  |  |  |  |
Credit Facility | Term Loan | Year Two |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Quarterly repayment rate |  |  | 7.50% |  | 7.50% |  |  |  |  |
Credit Facility | Term Loan | Year Three |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Quarterly repayment rate |  |  | 10.00% |  | 10.00% |  |  |  |  |
Credit Facility | Term Loan | Year Four |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Quarterly repayment rate |  |  | 12.50% |  | 12.50% |  |  |  |  |
Credit Facility | Term Loan | Year Five |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Quarterly repayment rate |  |  | 15.00% |  | 15.00% |  |  |  |  |
Securitization Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized issuance costs written off |  |  | $ 3,400,000 |  | $ 3,400,000 | $ 3,100,000 |  |  |  |
Amortization related to capitalized fees |  |  | $ 200,000 |  | $ 300,000 | $ 700,000 |  |  |  |
Weighted average interest rate |  |  | 2.50% |  | 2.50% | 2.05% |  |  |  |
Face amount |  | $ 600,000,000 |  |  |  |  |  |  |  |
Debt instrument, term |  | 2 years |  |  |  |  |  |  |  |
Debt issuance cost |  |  | $ 3,400,000 |  | $ 3,400,000 |  |  |  |  |

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