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Loans, overdrafts and long-term debt - Additional Information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Sep. 27, 2019	Nov. 02, 2019	Nov. 03, 2018	Nov. 02, 2019	Nov. 03, 2018	Feb. 02, 2019	May 19, 2014
Debt Instrument [Line Items]
Repayments of senior debt				$ 240,900,000	$ 0
Credit Facility
Debt Instrument [Line Items]
Write off of deferred financing fees		$ 2,000,000.0		2,000,000
Senior Unsecured Notes Due in 2024 | Senior Unsecured Notes
Debt Instrument [Line Items]
Write off of deferred financing fees		2,600,000		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		8,700,000		8,700,000
Payment for debt extinguishment third party fees		1,300,000		1,300,000
Unamortized debt issuance costs		1,200,000	$ 3,900,000	1,200,000	3,900,000	$ 3,700,000
Amortization of financing costs		200,000	$ 200,000	500,000	$ 500,000
Senior Asset-Based Credit Facility | Line of Credit
Debt Instrument [Line Items]
Amortization of financing costs		100,000		100,000
Capitalized fees		9,000,000.0		9,000,000.0
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		15,500,000		15,500,000
Available borrowing capacity		871,200,000		871,200,000
Capitalized fees		8,400,000		8,400,000
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
Capitalized fees		$ 600,000		$ 600,000

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