Segment Information - Summary of Activity by Segment (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jul. 30, 2022	Jul. 31, 2021	Jul. 30, 2022	Jul. 31, 2021
Segment Reporting Information [Line Items]
Sales	$ 1,754.9	$ 1,788.1	$ 3,593.2	$ 3,476.9
Operating income (loss):	186.8	225.4	187.0	394.1
Interest expense, net	(3.4)	(4.4)	(7.8)	(8.3)
Other non-operating income (expense)	(2.4)	0.1	(136.9)	0.2
Income before income taxes	181.0	221.1	42.3	386.0
Pre-tax litigation charges	0.0	0.0	190.0	0.0
Blue Nile
Segment Reporting Information [Line Items]
Acquisition and integration related costs	2.6
North America
Segment Reporting Information [Line Items]
Sales	1,616.4	1,645.7	3,321.4	3,263.7
International segment
Segment Reporting Information [Line Items]
Sales	111.6	130.7	221.6	188.1
Other segment
Segment Reporting Information [Line Items]
Sales	26.9	11.7	50.2	25.1
Reportable segments \| North America
Segment Reporting Information [Line Items]
Sales	1,616.4	1,645.7	3,321.4	3,263.7
Operating income (loss):	210.1	237.3	234.9	449.3
Restructuring charges		(0.3)		(1.0)
Pre-tax litigation charges			190.0
Gain on sale of financing receivable		1.4		1.4
Asset impairments, net		(0.2)		1.3
Reportable segments \| North America \| Diamonds Direct \| Fair Value Adjustment to Inventory
Segment Reporting Information [Line Items]
Operating income (loss):	(5.8)		(10.2)
Reportable segments \| North America \| Blue Nile
Segment Reporting Information [Line Items]
Acquisition and integration related costs	2.6		2.6
Reportable segments \| North America \| Rocksbox
Segment Reporting Information [Line Items]
Acquisition and integration related costs		0.0		1.1
Reportable segments \| International segment
Segment Reporting Information [Line Items]
Sales	111.6	130.7	221.6	188.1
Operating income (loss):	(2.0)	15.5	(8.4)	(4.2)
Reportable segments \| Other segment
Segment Reporting Information [Line Items]
Sales	26.9	11.7	50.2	25.1
Operating income (loss):	1.8	(0.1)	4.8	(1.0)
Corporate and unallocated expenses
Segment Reporting Information [Line Items]
Operating income (loss):	$ (23.1)	(27.3)	$ (44.3)	(50.0)
Restructuring charges		$ (0.6)		$ (0.6)

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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