Segment information - Information by Segment additional information (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2016	May. 02, 2015
Zale Jewelry
Segment Reporting Information [Line Items]
Operating loss related to purchase accounting adjustments	$ 5.2	$ 9.1
Piercing Pagoda
Segment Reporting Information [Line Items]
Operating loss related to purchase accounting adjustments	0.1	2.3
Other
Segment Reporting Information [Line Items]
Transaction related and integration expense	$ (5.3)	$ (6.4)