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Goodwill and intangibles - Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Mar. 29, 2021	May 02, 2020	Aug. 03, 2019	Jan. 29, 2022	Jan. 30, 2021	Feb. 01, 2020	Nov. 17, 2021
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss				$ 0.0	$ 10.7	$ 47.7
Indefinite-lived intangible asset impairment				0.0	83.3	0.0
Goodwill				484.6	238.0
Amortization of intangible assets				1.1	0.9	0.9
Amortization of intangible liabilities				3.3	5.4	5.5
Diamonds Direct USA Inc.
Finite-Lived Intangible Assets [Line Items]
Intangible assets							$ 126.0
Goodwill							$ 241.9
North America
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss		$ 10.7	$ 47.7		10.7
Acquisitions				246.6
Goodwill				$ 484.6	$ 238.0	$ 248.8
North America \| Zales
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss			35.2
Indefinite-lived intangible asset impairment		$ 83.3
North America \| R2Net Inc.
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss			$ 12.5
North America \| Rocksbox
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 11.6
Acquisitions	$ 4.7
Acquired finite-lived intangible assets, weighted average useful life	8 years