Segment Reporting Information, by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Nov. 01, 2014		Nov. 02, 2013	Nov. 01, 2014		Nov. 02, 2013	Feb. 01, 2014
Segment Reporting Information [Line Items]
Total sales	$ 1,177.9		$ 771.4	$ 3,459.9		$ 2,645.2
Total operating income	10.7		51.6	244.9		299.9
Total assets	6,178.5		3,765.4	6,178.5		3,765.4	4,029.2
Operating Segments | Sterling Jewelers
Segment Reporting Information [Line Items]
Total sales	692.8		631.3	2,406.7		2,229.6
Total operating income	68.1		60.6	364.3		325.3
Total assets	3,477.2		3,174.3	3,477.2		3,174.3	3,311.0
Operating Segments | Signet - UK Jewelry
Segment Reporting Information [Line Items]
Total sales	151.0		139.3	465.6		413.4
Total operating income	(2.7)		(4.4)	(1.6)		(9.3)
Total assets	484.5		495.3	484.5		495.3	484.6
Operating Segments | Zale Jewelry
Segment Reporting Information [Line Items]
Total sales	289.1			504.1
Total operating income	(26.7)	[1]		(34.7)	[1]
Total assets	1,942.6			1,942.6
Operating Segments | Piercing Pagoda
Segment Reporting Information [Line Items]
Total sales	42.3			74.8
Total operating income	(7.8)	[2]		(9.6)	[2]
Total assets	158.8			158.8
Operating Segments | Other
Segment Reporting Information [Line Items]
Total sales	2.7		0.8	8.7		2.2
Total operating income	(20.2)	[3]	(4.6)	(73.5)	[3]	(16.1)
Operating Segments | Other
Segment Reporting Information [Line Items]
Total assets	$ 115.4		$ 95.8	$ 115.4		$ 95.8	$ 233.6

[1] Includes net operating loss of $11.0 million and $20.4 million related to purchase accounting adjustments associated with the acquisition of Zale Corporation for the 13 and 39 weeks ended November 1, 2014, respectively. See Note 20 for additional information.

[2] Includes net operating loss of $2.6 million and $4.7 million related to purchase accounting adjustments associated with the acquisition of Zale Corporation for the 13 and 39 weeks ended November 1, 2014, respectively. See Note 20 for additional information.

[3] Includes $11.4 million and $50.6 million of transaction-related and integration expense as well as severance-related costs for the 13 and 39 weeks ended November 1, 2014, respectively.