Loans, overdrafts and long-term debt - Additional Information (Detail)		3 Months Ended			12 Months Ended
	Sep. 27, 2019 USD ($)	Jul. 31, 2021 USD ($)	Jan. 30, 2021 USD ($)	May 02, 2020 USD ($)	Jan. 29, 2022 USD ($)	Jan. 30, 2021 USD ($)	Feb. 01, 2020 USD ($)	Jul. 28, 2021 USD ($)	May 19, 2014 USD ($)
Debt Instrument [Line Items]
Repayments of senior debt					$ 0	$ 0	$ 241,500,000
Gain on extinguishment of debt					0	(400,000)	6,200,000
Payment of debt issuance costs					3,900,000	0	9,300,000
Proceeds from revolving credit facilities					0	900,000,000.0	858,300,000
Senior Unsecured Notes Due in 2024 | Signet UK Finance plc
Debt Instrument [Line Items]
Face amount									$ 400,000,000
Stated interest rate									4.70%
Credit Facility
Debt Instrument [Line Items]
Unamortized debt issuance costs							2,000,000
Senior Unsecured Notes Due in 2024 | Senior Notes
Debt Instrument [Line Items]
Unamortized debt issuance costs							2,600,000
Repayments of senior debt	$ 239,600,000
Redemption price per $1,000 of principal amount	950.00
Gain on extinguishment of debt							8,200,000
Payment for debt extinguishment third party fees							1,900,000
Unamortized debt issuance expense			$ 900,000		600,000	900,000
Amortization related to capitalized fees					300,000	200,000	600,000
Senior Asset-Based Credit Facility | Line of Credit
Debt Instrument [Line Items]
Unamortized debt issuance expense			6,400,000		8,300,000	6,400,000
Amortization related to capitalized fees					2,000,000	$ 1,700,000	$ 600,000
Term Loan Facility
Debt Instrument [Line Items]
Unamortized debt issuance costs			$ 400,000
Term Loan Facility | Senior Asset-Based Credit Facility | Line of Credit
Debt Instrument [Line Items]
Face amount					$ 100,000,000
Term Loan Facility | Senior Asset-Based Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate at period end			1.70%		1.40%	1.70%
Revolving Credit Facility | Senior Asset-Based Credit Facility | Line of Credit
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 1,500,000,000
Additional borrowing capacity								$ 600,000,000
Payment of debt issuance costs		$ 3,900,000
Stand-by letters of credit			$ 19,000,000		$ 20,100,000	$ 19,000,000
Line of credit facility, remaining borrowing capacity			$ 1,300,000,000		$ 1,200,000,000	$ 1,300,000,000
Proceeds from revolving credit facilities				$ 900,000,000
Covenant, minimum coverage ratio					1.00
Debt covenant, fixed covenant ratio threshold					$ 119,000,000
Capitalized fees					$ 12,600,000