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Loans, overdrafts and long-term debt - Additional Information (Details)		3 Months Ended		9 Months Ended
	Sep. 27, 2019 USD ($)	Oct. 31, 2020 USD ($)	Nov. 02, 2019 USD ($)	Oct. 31, 2020 USD ($)	Nov. 02, 2019 USD ($)	Feb. 01, 2020 USD ($)	May 19, 2014 USD ($)
Debt Instrument [Line Items]
Repayments of senior debt				$ 0	$ 240,900,000
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		$ 900,000	$ 1,200,000	900,000	1,200,000	$ 1,100,000
Amortization of financing costs		100,000	200,000	200,000	500,000
Senior Asset-Based Credit Facility | Line of Credit
Debt Instrument [Line Items]
Unamortized debt issuance costs		7,300,000	9,200,000	7,300,000	9,200,000	$ 8,700,000
Amortization of financing costs		500,000	$ 100,000	1,400,000	$ 100,000
Debt issuance costs		9,300,000		9,300,000
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		16,600,000		16,600,000
Available borrowing capacity		483,100,000		$ 483,100,000
Debt instrument, covenant, minimum coverage ratio				1.00
Debt covenant, fixed covenant ratio threshold		132,000,000		$ 132,000,000
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
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%

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