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Goodwill and intangibles - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Aug. 03, 2024	Aug. 03, 2024	Jun. 01, 2024
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment		$ 123.0
Digital banners
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment	$ 123.0
Goodwill, Fair Value Disclosure			$ 203.1
Diamonds Direct \| Trade names
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible asset impairment	7.0
Indefinite-Lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure			119.0
Blue Nile \| Trade names
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible asset impairment	$ 36.0
Indefinite-Lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure			$ 60.0
North America
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment		$ 123.0