Summary of Changes In Fair Value of Level 3 Investment Assets (Detail) (UK Plan, USD $) In Millions, unless otherwise specified	12 Months Ended
Feb. 01, 2014	Feb. 02, 2013
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance	$ 261.1	$ 236.0
Actual return on assets	13.1	22.1
Ending Balance	282.6	261.1
Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Beginning Balance	10.4	10.3
Actual return on assets	1.2	0.1
Ending Balance	$ 11.6	$ 10.4

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

-URI http://asc.fasb.org/extlink&oid=6504192

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6504226

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration