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Revenue recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Aug. 01, 2020	Jul. 31, 2021	Aug. 01, 2020
Disaggregation of Revenue [Line Items]
Sales	$ 1,788.1	$ 888.0	$ 3,476.9	$ 1,740.1
Bridal
Disaggregation of Revenue [Line Items]
Sales	757.6	445.9	1,513.1	788.1
Fashion
Disaggregation of Revenue [Line Items]
Sales	701.4	307.2	1,372.5	617.7
Watches
Disaggregation of Revenue [Line Items]
Sales	99.6	46.1	163.7	88.2
Other
Disaggregation of Revenue [Line Items]
Sales	229.5	88.8	427.6	246.1
Store
Disaggregation of Revenue [Line Items]
Sales	1,440.2	613.9	2,769.3	1,295.2
Kay
Disaggregation of Revenue [Line Items]
Sales	673.7	325.0	1,350.4	658.5
Zales
Disaggregation of Revenue [Line Items]
Sales	367.3	185.1	738.1	367.4
Jared
Disaggregation of Revenue [Line Items]
Sales	311.9	168.5	596.0	313.9
Piercing Pagoda
Disaggregation of Revenue [Line Items]
Sales	138.7	59.3	287.6	110.7
James Allen
Disaggregation of Revenue [Line Items]
Sales	108.8	64.3	210.3	108.1
Peoples
Disaggregation of Revenue [Line Items]
Sales	41.4	20.8	76.0	45.5
International segment
Disaggregation of Revenue [Line Items]
Sales	130.7	61.0	188.1	125.9
Other
Disaggregation of Revenue [Line Items]
Sales	15.6	4.0	30.4	10.1
E-commerce
Disaggregation of Revenue [Line Items]
Sales	336.2	270.1	682.5	434.8
Other
Disaggregation of Revenue [Line Items]
Sales	11.7	4.0	25.1	10.1
North America
Disaggregation of Revenue [Line Items]
Sales	1,645.7	823.0	3,263.7	1,604.1
North America | Bridal
Disaggregation of Revenue [Line Items]
Sales	696.9	417.1	1,423.6	731.2
North America | Fashion
Disaggregation of Revenue [Line Items]
Sales	680.7	294.5	1,342.1	592.4
North America | Watches
Disaggregation of Revenue [Line Items]
Sales	58.6	23.7	105.5	48.3
North America | Other
Disaggregation of Revenue [Line Items]
Sales	209.5	87.7	392.5	232.2
North America | Store
Disaggregation of Revenue [Line Items]
Sales	1,333.3	574.6	2,632.9	1,206.5
North America | Kay
Disaggregation of Revenue [Line Items]
Sales	673.7	325.0	1,350.4	658.5
North America | Zales
Disaggregation of Revenue [Line Items]
Sales	367.3	185.1	738.1	367.4
North America | Jared
Disaggregation of Revenue [Line Items]
Sales	311.9	168.5	596.0	313.9
North America | Piercing Pagoda
Disaggregation of Revenue [Line Items]
Sales	138.7	59.3	287.6	110.7
North America | James Allen
Disaggregation of Revenue [Line Items]
Sales	108.8	64.3	210.3	108.1
North America | Peoples
Disaggregation of Revenue [Line Items]
Sales	41.4	20.8	76.0	45.5
North America | International segment
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
North America | Other
Disaggregation of Revenue [Line Items]
Sales	3.9	0.0	5.3	0.0
North America | E-commerce
Disaggregation of Revenue [Line Items]
Sales	312.4	248.4	630.8	397.6
North America | Other
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment
Disaggregation of Revenue [Line Items]
Sales	130.7	61.0	188.1	125.9
International segment | Bridal
Disaggregation of Revenue [Line Items]
Sales	60.7	28.8	89.5	56.9
International segment | Fashion
Disaggregation of Revenue [Line Items]
Sales	20.7	12.7	30.4	25.3
International segment | Watches
Disaggregation of Revenue [Line Items]
Sales	41.0	22.4	58.2	39.9
International segment | Other
Disaggregation of Revenue [Line Items]
Sales	8.3	(2.9)	10.0	3.8
International segment | Store
Disaggregation of Revenue [Line Items]
Sales	106.9	39.3	136.4	88.7
International segment | Kay
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | Zales
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | Jared
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | Piercing Pagoda
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | James Allen
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | Peoples
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | International segment
Disaggregation of Revenue [Line Items]
Sales	130.7	61.0	188.1	125.9
International segment | Other
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
International segment | E-commerce
Disaggregation of Revenue [Line Items]
Sales	23.8	21.7	51.7	37.2
International segment | Other
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other
Disaggregation of Revenue [Line Items]
Sales	11.7	4.0	25.1	10.1
Other | Bridal
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Fashion
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Watches
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Sales	11.7	4.0	25.1	10.1
Other | Store
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Kay
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Zales
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Jared
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Piercing Pagoda
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | James Allen
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Peoples
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | International segment
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Sales	11.7	4.0	25.1	10.1
Other | E-commerce
Disaggregation of Revenue [Line Items]
Sales	0.0	0.0	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Sales	$ 11.7	$ 4.0	$ 25.1	$ 10.1

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