Goodwill and intangibles - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
	Aug. 19, 2022	Feb. 01, 2025	Aug. 03, 2024	Feb. 01, 2025	Feb. 03, 2024	Jan. 28, 2023	Jun. 01, 2024
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible asset impairment				$ 94.0	$ 0.0	$ 0.0
Goodwill, Impairment Loss				272.5	0.0	0.0
Amortization of Intangible Assets				0.9	1.9	2.3
Amortization of intangible liabilities				1.8	$ 1.8	$ 1.8
Digital brands
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss		$ 149.5	$ 123.0
Goodwill, Fair Value Disclosure		53.6		53.6			$ 203.1
Diamonds Direct | Trade names
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible asset impairment		7.0	7.0
Indefinite-Lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure		112.0		112.0			119.0
Blue Nile
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired	$ 96.0
Goodwill, Acquired During Period	$ 256.8
Blue Nile | Trade names
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible asset impairment		41.0	$ 36.0
Indefinite-Lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure		19.0		19.0			$ 60.0
James Allen | Trade names
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible asset impairment		3.0
Indefinite-Lived Intangible Assets (Excluding Goodwill), Fair Value Disclosure		$ 15.0		$ 15.0