Segment information - Information by Segment additional information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 29, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015
Zale Jewelry
Segment Reporting Information [Line Items]
Operating loss related to purchase accounting adjustments	$ 3.7	$ 3.6	$ 13.2	$ 17.1
Piercing Pagoda
Segment Reporting Information [Line Items]
Operating loss related to purchase accounting adjustments	0.1	0.1	0.3	3.1
Other
Segment Reporting Information [Line Items]
Transaction related and integration expense	$ (7.9)	$ (9.8)	$ (18.5)	$ (59.8)