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Goodwill and Intangibles - Composition of Finite-Lived Intangibles (Details) - USD ($) $ in Millions	Aug. 19, 2022	Nov. 17, 2021	Oct. 29, 2022	Jan. 29, 2022	Oct. 30, 2021
Intangible assets, net:
Gross carrying amount			$ 15.8	$ 15.8	$ 15.8
Accumulated amortization			(7.1)	(5.3)	(4.6)
Net carrying amount			8.7	10.5	11.2
Indefinite-lived intangible assets			404.8	303.7	178.0
Intangible assets, gross			420.6	319.5	193.8
Total intangible assets, net			413.5	314.2	189.2
Intangible liabilities, net
Gross carrying amount			(38.0)	(38.0)	(38.0)
Accumulated amortization			32.2	30.8	30.5
Total			$ (5.8)	$ (7.2)	$ (7.5)
Diamonds Direct \| Trade names
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired		$ 126.0
Diamonds Direct \| Trade names \| North America
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired		$ 126.0
Blue Nile \| North America
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets acquired	$ 102.0