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Retirement plans - Narrative (Details) £ in Millions, $ in Millions									3 Months Ended			12 Months Ended			18 Months Ended
	Jan. 06, 2023 GBP (£)	Jan. 06, 2023 USD ($)	Mar. 23, 2022 GBP (£)	Mar. 23, 2022 USD ($)	Aug. 09, 2021 GBP (£)	Aug. 09, 2021 USD ($)	Jul. 29, 2021 GBP (£) employee	Jul. 29, 2021 USD ($) employee	Jan. 28, 2023 USD ($) plan	Jul. 30, 2022 USD ($)	Apr. 30, 2022 USD ($)	Jan. 28, 2023 USD ($) plan	Jan. 29, 2022 USD ($)	Jan. 30, 2021 USD ($)	Jan. 28, 2023 GBP (£)	Jan. 28, 2023 USD ($) plan
Defined Contribution Plan Disclosure [Line Items]
Number of pension scheme members | employee							1,909	1,909
Deferred compensation plan assets									$ 22.3			$ 22.3	$ 22.7			$ 22.3
Liability, defined contribution plan									33.9			33.9	32.4			33.9
Life Insurance
Defined Contribution Plan Disclosure [Line Items]
Deferred compensation plan assets									$ 5.5			5.5	6.0			$ 5.5
Pension plan
Defined Contribution Plan Disclosure [Line Items]
Employer discretionary contribution amount												$ 12.6	13.0	$ 3.2
Employer matching contribution, percent of match												50.00%
Employer matching contribution, maximum, percent of employees' gross pay												6.00%
Number of US non-qualified deferred compensation plans | plan									2			2				2
Cost recognized												$ 1.7	2.2	0.8
Pension plan | Foreign Plan
Defined Contribution Plan Disclosure [Line Items]
Employer contributions												10.4	12.4
Actuarial (gain) loss												(29.5)	67.4
Pension settlement loss									$ (0.9)	$ (0.9)	$ (131.9)	(133.7)	0.0	0.0
Accumulated benefit obligation									1.6			1.6	303.3			$ 1.6
Employer discretionary contribution amount												2.5	$ 2.4	$ 2.4
Pension plan | Foreign Plan | Maximum
Defined Contribution Plan Disclosure [Line Items]
Estimated future employer contributions in next fiscal year									$ 1.0			$ 1.0				1.0
Pension plan | Signet Group Limited
Defined Contribution Plan Disclosure [Line Items]
Employer contributions	£ 1.0	$ 1.2	£ 7.0	$ 9.2			£ 7.0	$ 9.7							£ 15.0	$ 20.1
Actuarial (gain) loss					£ 53.3	$ 72.9

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