Segment Information - Summary of Activity by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2022	May 01, 2021
Segment Reporting Information [Line Items]
Sales	$ 1,838.3	$ 1,688.8
Operating income (loss):	0.2	168.7
Interest expense, net	(4.4)	(3.9)
Other non-operating income (expense)	(134.5)	0.1
Income (loss) before income taxes	(138.7)	164.9
Pre-tax litigation charges	190.0	0.0
North America
Segment Reporting Information [Line Items]
Sales	1,705.0	1,618.0
International segment
Segment Reporting Information [Line Items]
Sales	110.0	57.4
Other segment
Segment Reporting Information [Line Items]
Sales	23.3	13.4
Reportable segments | North America
Segment Reporting Information [Line Items]
Sales	1,705.0	1,618.0
Operating income (loss):	24.8	212.0
Pre-tax litigation charges	190.0
Restructuring charges		(0.7)
Asset impairments, net		1.5
Reportable segments | North America | Diamonds Direct | Fair Value Adjustment to Inventory
Segment Reporting Information [Line Items]
Operating income (loss):	(4.4)
Reportable segments | North America | Rocksbox
Segment Reporting Information [Line Items]
Acquisition and integration related costs		1.1
Reportable segments | International segment
Segment Reporting Information [Line Items]
Sales	110.0	57.4
Operating income (loss):	(6.4)	(19.7)
Reportable segments | Other segment
Segment Reporting Information [Line Items]
Sales	23.3	13.4
Operating income (loss):	3.0	(0.9)
Corporate and unallocated expenses
Segment Reporting Information [Line Items]
Operating income (loss):	$ (21.2)	$ (22.7)