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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Goodwill and intangibles - Narrative (Details) - USD ($) $ in Millions				12 Months Ended
	Aug. 19, 2022	Nov. 17, 2021	Mar. 29, 2021	Feb. 03, 2024	Jan. 28, 2023	Jan. 29, 2022
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets				$ 1.9	$ 2.3	$ 1.1
Amortization of intangible liabilities				$ 1.8	$ 1.8	$ 3.3
Rocksbox
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired			$ 11.6
Goodwill, Acquired During Period			$ 4.6
Acquired finite-lived intangible assets, weighted average useful life			8 years
Diamonds Direct USA Inc.
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period		$ 251.2
Indefinite-lived intangible assets acquired		$ 126.0
Blue Nile
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	$ 256.8
Indefinite-lived intangible assets acquired	$ 96.0