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Acquisitions - Narrative (Detail)				3 Months Ended		5 Months Ended	6 Months Ended
Acquisitions - Narrative (Detail)	Aug. 19, 2022 USD ($) showroom	Nov. 17, 2021 USD ($)	Mar. 29, 2021 USD ($)	Jul. 30, 2022 USD ($)	Apr. 30, 2022 USD ($)	Apr. 30, 2022 USD ($)	Jul. 30, 2022 USD ($)	Jul. 31, 2021 USD ($)
Business Acquisition [Line Items]
Cash consideration							$ 1,900,000	$ 14,400,000
Rocksbox
Business Acquisition [Line Items]
Cash consideration			$ 14,600,000
Diamonds Direct
Business Acquisition [Line Items]
Cash consideration						$ 503,100,000
Cash acquired from acquisition		$ 14,200,000
Additional payment					$ 1,900,000
Goodwill, expected tax deductible amount		0
Diamonds Direct \| Trade names
Business Acquisition [Line Items]
Intangible assets		$ 126,000,000
Blue Nile
Business Acquisition [Line Items]
Acquisition and integration related costs				$ 2,600,000
Blue Nile \| Subsequent Event
Business Acquisition [Line Items]
Cash consideration	$ 398,200,000
Percentage of voting interests acquired	100.00%
Number of physical showrooms \| showroom	23