Revenue recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	May 04, 2024	Apr. 29, 2023
Disaggregation of Revenue [Line Items]
Total sales	$ 1,510.8	$ 1,668.0
Bridal
Disaggregation of Revenue [Line Items]
Total sales	674.6	768.7
Fashion
Disaggregation of Revenue [Line Items]
Total sales	552.0	587.0
Watches
Disaggregation of Revenue [Line Items]
Total sales	63.5	74.9
Services
Disaggregation of Revenue [Line Items]
Total sales	184.5	182.1
Other
Disaggregation of Revenue [Line Items]
Total sales	36.2	55.3
Kay
Disaggregation of Revenue [Line Items]
Total sales	567.5	602.2
Zales
Disaggregation of Revenue [Line Items]
Total sales	256.7	295.4
Jared
Disaggregation of Revenue [Line Items]
Total sales	249.5	274.0
Digital banners
Disaggregation of Revenue [Line Items]
Total sales	133.7	168.2
Diamonds Direct
Disaggregation of Revenue [Line Items]
Total sales	82.6	88.2
Banter by Piercing Pagoda
Disaggregation of Revenue [Line Items]
Total sales	83.6	85.5
Peoples
Disaggregation of Revenue [Line Items]
Total sales	39.2	38.2
International segment banners
Disaggregation of Revenue [Line Items]
Total sales	77.2	93.0
Other
Disaggregation of Revenue [Line Items]
Total sales	20.8	23.3
Store
Disaggregation of Revenue [Line Items]
Total sales	1,155.1	1,267.8
eCommerce
Disaggregation of Revenue [Line Items]
Total sales	337.9	380.6
Other
Disaggregation of Revenue [Line Items]
Total sales	17.8	19.6
North America
Disaggregation of Revenue [Line Items]
Total sales	1,420.0	1,561.2
North America | Bridal
Disaggregation of Revenue [Line Items]
Total sales	639.3	727.7
North America | Fashion
Disaggregation of Revenue [Line Items]
Total sales	536.8	571.4
North America | Watches
Disaggregation of Revenue [Line Items]
Total sales	42.7	44.8
North America | Services
Disaggregation of Revenue [Line Items]
Total sales	178.6	175.8
North America | Other
Disaggregation of Revenue [Line Items]
Total sales	22.6	41.5
North America | Kay
Disaggregation of Revenue [Line Items]
Total sales	567.5	602.2
North America | Zales
Disaggregation of Revenue [Line Items]
Total sales	256.7	295.4
North America | Jared
Disaggregation of Revenue [Line Items]
Total sales	249.5	274.0
North America | Digital banners
Disaggregation of Revenue [Line Items]
Total sales	133.7	168.2
North America | Diamonds Direct
Disaggregation of Revenue [Line Items]
Total sales	82.6	88.2
North America | Banter by Piercing Pagoda
Disaggregation of Revenue [Line Items]
Total sales	83.6	85.5
North America | Peoples
Disaggregation of Revenue [Line Items]
Total sales	39.2	38.2
North America | International segment banners
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
North America | Other
Disaggregation of Revenue [Line Items]
Total sales	7.2	9.5
North America | Store
Disaggregation of Revenue [Line Items]
Total sales	1,094.3	1,191.0
North America | eCommerce
Disaggregation of Revenue [Line Items]
Total sales	321.5	364.4
North America | Other
Disaggregation of Revenue [Line Items]
Total sales	4.2	5.8
International segment banners
Disaggregation of Revenue [Line Items]
Total sales	77.2	93.0
International segment banners | Bridal
Disaggregation of Revenue [Line Items]
Total sales	35.3	41.0
International segment banners | Fashion
Disaggregation of Revenue [Line Items]
Total sales	15.2	15.6
International segment banners | Watches
Disaggregation of Revenue [Line Items]
Total sales	20.8	30.1
International segment banners | Services
Disaggregation of Revenue [Line Items]
Total sales	5.9	6.3
International segment banners | Other
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
International segment banners | Kay
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
International segment banners | Zales
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
International segment banners | Jared
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
International segment banners | Digital banners
Disaggregation of Revenue [Line Items]
Total sales	0.0
International segment banners | Diamonds Direct
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
International segment banners | Banter by Piercing Pagoda
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
International segment banners | Peoples
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
International segment banners | International segment banners
Disaggregation of Revenue [Line Items]
Total sales	77.2	93.0
International segment banners | Other
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
International segment banners | Store
Disaggregation of Revenue [Line Items]
Total sales	60.8	76.8
International segment banners | eCommerce
Disaggregation of Revenue [Line Items]
Total sales	16.4	16.2
International segment banners | Other
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other
Disaggregation of Revenue [Line Items]
Total sales	13.6	13.8
Other | Bridal
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | Fashion
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | Watches
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | Services
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Total sales	13.6	13.8
Other | Kay
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | Zales
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | Jared
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | Digital banners
Disaggregation of Revenue [Line Items]
Total sales	0.0
Other | Diamonds Direct
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | Banter by Piercing Pagoda
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | Peoples
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | International segment banners
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Total sales	13.6	13.8
Other | Store
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | eCommerce
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Total sales	$ 13.6	$ 13.8