Segment Reporting Information, by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jul. 28, 2012		Jul. 30, 2011		Jul. 28, 2012		Jul. 30, 2011		Jan. 28, 2012
Segment Reporting Information [Line Items]
Total sales	$ 853.9		$ 797.6		$ 1,753.9		$ 1,684.9
Total operating income	110.9		102.3		240.3		221.0
Total assets	3,319.0		3,247.5		3,319.0		3,247.5		3,611.4
US
Segment Reporting Information [Line Items]
Total sales	701.9		643.0		1,453.4		1,381.0
Total operating income	117.3		104.4		255.0		230.6
Total assets	2,683.8		2,506.8		2,683.8		2,506.8		2,747.5
UK
Segment Reporting Information [Line Items]
Total sales	152.0		154.6		300.5		303.9
Total operating income	(0.3)		2.8		(3.3)		2.6
Total assets	437.3		410.6		437.3		410.6		427.3
Unallocated Amount to Segment
Segment Reporting Information [Line Items]
Total operating income	(6.1)	[1]	(4.9)	[1]	(11.4)	[1]	(12.2)	[1]
Total assets	$ 197.9	[1]	$ 330.1	[1]	$ 197.9	[1]	$ 330.1	[1]	$ 436.6	[1]

[1] Unallocated principally relates to central costs and assets, which include corporate and general administrative functions.