Acquisitions and divestitures - Narrative (Details)			3 Months Ended	12 Months Ended
	Jul. 11, 2023 USD ($)	Aug. 19, 2022 USD ($)	Feb. 03, 2024 USD ($)	Feb. 01, 2025 USD ($)	Feb. 03, 2024 USD ($)	Jan. 28, 2023 USD ($)	Oct. 18, 2024 location
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				$ 0	$ 6,000,000.0	$ 391,800,000
Proceeds from Divestiture of Businesses, Net of Cash Divested				0	53,800,000	0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal				(2,600,000)	$ 12,300,000	0
UK Prestige Watch Business
Business Acquisition [Line Items]
Number of Stores | location							21
Proceeds from Divestiture of Businesses, Net of Cash Divested			$ 53,800,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal			$ 12,300,000	$ (2,600,000)
Blue Nile
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		$ 389,900,000
Cash acquired from acquisition		16,600,000
Business combination, acquisition-related costs						$ 4,200,000
Intangible assets		96,000,000.0
Other carryforwards		71,000,000
Goodwill, expected tax deductible amount		0
Blue Nile | Domestic Tax Jurisdiction
Business Acquisition [Line Items]
Net operating loss carry forwards		90,000,000
Blue Nile | Trade names
Business Acquisition [Line Items]
Intangible assets		$ 96,000,000
Service Jewelry & Repair, Inc.
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 6,000,000