Deferred revenue rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2016	May. 02, 2015
Sterling Jewelers
Deferred Revenue Warranty [Roll Forward]
ESP deferred revenue, beginning of period	$ 715.1	$ 668.9
Plans sold	76.0	69.3
Revenue recognized	(67.3)	(47.5)
ESP deferred revenue, end of period	723.8	690.7
Zale
Deferred Revenue Warranty [Roll Forward]
ESP deferred revenue, beginning of period	146.1	120.3
Plans sold	40.6	35.2
Revenue recognized	(31.6)	(26.2)
ESP deferred revenue, end of period	$ 155.1	$ 129.3