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Goodwill and intangibles - Narrative (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Mar. 29, 2021	May 02, 2020	Jan. 28, 2023	Jan. 29, 2022	Jan. 30, 2021	Aug. 19, 2022	Nov. 17, 2021
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss			$ 0.0	$ 0.0	$ 10.7
Indefinite-lived intangible asset impairment			0.0	0.0	83.3
Goodwill			751.7	484.6
Amortization of intangible assets			2.3	1.1	0.9
Amortization of intangible liabilities			1.8	3.3	5.4
Diamonds Direct USA Inc.
Finite-Lived Intangible Assets [Line Items]
Goodwill							$ 251.2
Blue Nile
Finite-Lived Intangible Assets [Line Items]
Goodwill						$ 258.0
North America
Finite-Lived Intangible Assets [Line Items]
Goodwill, impairment loss		$ 10.7
Acquisitions			267.1	246.6
Goodwill			$ 751.7	$ 484.6	$ 238.0
North America | Zales
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible asset impairment		$ 83.3
North America | Rocksbox
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired	$ 11.6
Acquisitions	$ 4.6
Acquired finite-lived intangible assets, weighted average useful life	8 years

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