Segment information - Information by Segment additional information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 30, 2016	Aug. 01, 2015	Jul. 30, 2016	Aug. 01, 2015
Zale Jewelry
Segment Reporting Information [Line Items]
Operating loss related to purchase accounting adjustments	$ 4.3	$ 4.4	$ 9.5	$ 13.5
Piercing Pagoda
Segment Reporting Information [Line Items]
Operating loss related to purchase accounting adjustments	0.1	0.7	0.2	3.0
Other
Segment Reporting Information [Line Items]
Transaction related and integration expense	$ (5.3)	$ (43.6)	$ (10.6)	$ (50.0)