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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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible tax carryforwards, classified as other.

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Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

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Represents the number of stores.

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No definition available.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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This element represents the cash inflow during the period from the sale of a component of the entity.

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Acquisitions and divestitures - Narrative (Details)					3 Months Ended		12 Months Ended
Acquisitions and divestitures - Narrative (Details)	Jul. 11, 2023 USD ($)	Aug. 19, 2022 USD ($)	Nov. 17, 2021 USD ($)	Mar. 29, 2021 USD ($)	Feb. 03, 2024 USD ($)	Apr. 30, 2022 USD ($)	Feb. 03, 2024 USD ($)	Jan. 28, 2023 USD ($)	Jan. 29, 2022 USD ($)	Oct. 28, 2023 location
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired							$ 6,000,000.0	$ 391,800,000	$ 515,800,000
Proceeds from Divestiture of Businesses, Net of Cash Divested							53,800,000	0	0
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal							$ 12,300,000	0	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
Rocksbox
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				$ 14,600,000
Business combination, acquisition-related costs									1,400,000
Diamonds Direct USA Inc.
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 503,100,000
Business combination, acquisition-related costs									$ 5,000,000
Cash acquired from acquisition			14,200,000
Additional payment						$ 1,900,000
Intangible assets			126,000,000.0
Goodwill, expected tax deductible amount			0
Diamonds Direct USA Inc. \| Trade names
Business Acquisition [Line Items]
Intangible assets			$ 126,000,000
Blue Nile
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		$ 389,900,000
Business combination, acquisition-related costs								$ 4,200,000
Cash acquired from acquisition		16,600,000
Intangible assets		96,000,000.0
Goodwill, expected tax deductible amount		0
Other carryforwards		71,000,000
Blue Nile \| Domestic Tax Authority
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