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Loans, overdrafts and long-term debt - Narrative (Details)		3 Months Ended			12 Months Ended
	Sep. 05, 2019 USD ($)	Jul. 31, 2021 USD ($)	Jan. 30, 2021 USD ($)	May 02, 2020 USD ($)	Jan. 28, 2023 USD ($)	Jan. 29, 2022 USD ($)	Jan. 30, 2021 USD ($)	Jul. 28, 2021 USD ($)	Sep. 27, 2019 USD ($)	Sep. 06, 2019 USD ($)	May 19, 2014 USD ($)
Debt Instrument [Line Items]
Payment of debt issuance costs					$ 0	$ 3,900,000	$ 0
Proceeds from revolving credit facilities					0	0	900,000,000.0
Senior Unsecured Notes Due in 2024 | Senior Unsecured Notes Due in 2024 | Signet UK Finance plc
Debt Instrument [Line Items]
Face amount											$ 400,000,000
Stated interest rate											4.70%
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
Unamortized debt issuance expense					300,000	600,000
Amortization related to capitalized fees					300,000	300,000	200,000
Senior Asset-Based Credit Facility | Term Loan Facility
Debt Instrument [Line Items]
Unamortized debt issuance costs			$ 400,000
Senior Asset-Based Credit Facility | Line of Credit
Debt Instrument [Line Items]
Unamortized debt issuance expense					6,400,000	8,300,000
Amortization related to capitalized fees					1,900,000	2,000,000	$ 1,700,000
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
Payment of debt issuance costs		$ 3,900,000
Stand-by letters of credit					18,100,000	20,100,000
Long-term debt					0	0
Line of credit facility, remaining borrowing capacity					$ 1,400,000,000	$ 1,200,000,000
Proceeds from revolving credit facilities				$ 900,000,000
Covenant, minimum coverage ratio					1.00
Debt covenant, fixed covenant ratio threshold					$ 126,000,000
Capitalized fees					$ 12,600,000
Senior Asset-Based Credit Facility | Line of Credit | Term Loan Facility
Debt Instrument [Line Items]
Face amount									$ 100,000,000
Senior Asset-Based Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate at period end					5.80%	1.40%

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