Summary of Goodwill by Reporting Unit (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Aug. 02, 2014		Feb. 01, 2014		Aug. 03, 2013
Goodwill [Line Items]
Beginning balance	$ 26.8		$ 24.6		$ 23.2
Acquisition	525.1	[1]	2.2	[1]
Ending balance	551.9		26.8		23.2
Sterling Jewelers
Goodwill [Line Items]
Beginning balance			24.6
Acquisition			(1.4)	[1]
Ending balance	23.2		23.2
Zale Jewelry
Goodwill [Line Items]
Acquisition	525.1	[1]
Ending balance	525.1
Other
Goodwill [Line Items]
Acquisition			3.6	[1]
Ending balance	$ 3.6		$ 3.6

[1] See Note 20 for additional discussion of the goodwill recorded by the Company during Fiscal 2014 and Fiscal 2015.