Deferred revenue rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 29, 2016	Oct. 31, 2015	Oct. 29, 2016	Oct. 31, 2015
Sterling Jewelers
Deferred Revenue Warranty [Roll Forward]
ESP deferred revenue, beginning of period	$ 720.3	$ 691.4	$ 715.1	$ 668.9
Plans sold	52.8	51.8	190.4	180.2
Revenue recognized	(62.9)	(58.5)	(195.3)	(164.4)
ESP deferred revenue, end of period	710.2	684.7	710.2	684.7
Zale
Deferred Revenue Warranty [Roll Forward]
ESP deferred revenue, beginning of period	156.2	132.3	146.1	120.3
Plans sold	28.3	26.7	100.8	91.3
Revenue recognized	(29.3)	(26.4)	(91.7)	(79.0)
ESP deferred revenue, end of period	$ 155.2	$ 132.6	$ 155.2	$ 132.6