Revenue recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 01, 2025	Feb. 03, 2024	Jan. 28, 2023
Disaggregation of Revenue [Line Items]
Total sales	$ 6,703.8	$ 7,171.1	$ 7,842.1
Bridal
Disaggregation of Revenue [Line Items]
Total sales	2,873.2	3,133.1	3,486.0
Fashion
Disaggregation of Revenue [Line Items]
Total sales	2,629.4	2,756.9	3,043.8
Watches
Disaggregation of Revenue [Line Items]
Total sales	318.2	345.7	385.5
Service sales
Disaggregation of Revenue [Line Items]
Total sales	745.2	741.5	706.6
Other
Disaggregation of Revenue [Line Items]
Total sales	137.8	193.9	220.2
Kay
Disaggregation of Revenue [Line Items]
Total sales	2,495.0	2,600.0	2,804.2
Zales
Disaggregation of Revenue [Line Items]
Total sales	1,191.0	1,266.9	1,445.0
Jared
Disaggregation of Revenue [Line Items]
Total sales	1,102.7	1,189.6	1,313.5
Digital brands
Disaggregation of Revenue [Line Items]
Total sales	560.2	662.8	571.8
Diamonds Direct
Disaggregation of Revenue [Line Items]
Total sales	392.2	408.1	467.1
Banter by Piercing Pagoda
Disaggregation of Revenue [Line Items]
Total sales	339.2	347.1	417.9
Peoples
Disaggregation of Revenue [Line Items]
Total sales	197.8	196.0	209.1
International
Disaggregation of Revenue [Line Items]
Total sales	373.2	430.7	470.1
Other
Disaggregation of Revenue [Line Items]
Total sales	52.5	69.9	143.4
Store
Disaggregation of Revenue [Line Items]
Total sales	5,135.4	5,474.4	6,114.5
eCommerce
Disaggregation of Revenue [Line Items]
Total sales	1,521.7	1,640.4	1,599.4
Other
Disaggregation of Revenue [Line Items]
Total sales	46.7	56.3	128.2
North America
Disaggregation of Revenue [Line Items]
Total sales	6,299.1	6,703.8	7,289.5
North America | Bridal
Disaggregation of Revenue [Line Items]
Total sales	2,705.8	2,946.9	3,281.2
North America | Fashion
Disaggregation of Revenue [Line Items]
Total sales	2,548.4	2,672.4	2,957.6
North America | Watches
Disaggregation of Revenue [Line Items]
Total sales	217.3	212.0	232.6
North America | Service sales
Disaggregation of Revenue [Line Items]
Total sales	721.3	715.2	680.4
North America | Other
Disaggregation of Revenue [Line Items]
Total sales	106.3	157.3	137.7
North America | Kay
Disaggregation of Revenue [Line Items]
Total sales	2,495.0	2,600.0	2,804.2
North America | Zales
Disaggregation of Revenue [Line Items]
Total sales	1,191.0	1,266.9	1,445.0
North America | Jared
Disaggregation of Revenue [Line Items]
Total sales	1,102.7	1,189.6	1,313.5
North America | Digital brands
Disaggregation of Revenue [Line Items]
Total sales	560.2	662.8	571.8
North America | Diamonds Direct
Disaggregation of Revenue [Line Items]
Total sales	392.2	408.1	467.1
North America | Banter by Piercing Pagoda
Disaggregation of Revenue [Line Items]
Total sales	339.2	347.1	417.9
North America | Peoples
Disaggregation of Revenue [Line Items]
Total sales	197.8	196.0	209.1
North America | International
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
North America | Other
Disaggregation of Revenue [Line Items]
Total sales	21.0	33.3	60.9
North America | Store
Disaggregation of Revenue [Line Items]
Total sales	4,846.3	5,125.1	5,728.5
North America | eCommerce
Disaggregation of Revenue [Line Items]
Total sales	1,437.6	1,559.0	1,515.3
North America | Other
Disaggregation of Revenue [Line Items]
Total sales	15.2	19.7	45.7
International
Disaggregation of Revenue [Line Items]
Total sales	373.2	430.7	470.1
International | Bridal
Disaggregation of Revenue [Line Items]
Total sales	167.4	186.2	204.8
International | Fashion
Disaggregation of Revenue [Line Items]
Total sales	81.0	84.5	86.2
International | Watches
Disaggregation of Revenue [Line Items]
Total sales	100.9	133.7	152.9
International | Service sales
Disaggregation of Revenue [Line Items]
Total sales	23.9	26.3	26.2
International | Other
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
International | Kay
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
International | Zales
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
International | Jared
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
International | Digital brands
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
International | Diamonds Direct
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
International | Banter by Piercing Pagoda
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
International | Peoples
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
International | International
Disaggregation of Revenue [Line Items]
Total sales	373.2	430.7	470.1
International | Other
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
International | Store
Disaggregation of Revenue [Line Items]
Total sales	289.1	349.3	386.0
International | eCommerce
Disaggregation of Revenue [Line Items]
Total sales	84.1	81.4	84.1
International | Other
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other
Disaggregation of Revenue [Line Items]
Total sales	31.5	36.6	82.5
Other | Bridal
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Fashion
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Watches
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Service sales
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Total sales	31.5	36.6	82.5
Other | Kay
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Zales
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Jared
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Digital brands
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Diamonds Direct
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Banter by Piercing Pagoda
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Peoples
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | International
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Total sales	31.5	36.6	82.5
Other | Store
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | eCommerce
Disaggregation of Revenue [Line Items]
Total sales	0.0	0.0	0.0
Other | Other
Disaggregation of Revenue [Line Items]
Total sales	$ 31.5	$ 36.6	$ 82.5