Options Exchanged and Issued (Detail)	12 Months Ended	1 Months Ended
Jan. 29, 2012	Jan. 30, 2011	Jan. 31, 2010	Feb. 28, 2010 Stock Option Exchange Program	Feb. 28, 2010 Stock Option Exchange Program Repriced Options Issued	Feb. 28, 2010 Stock Option Exchange Program New $10.00 Options Issued
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Eligible Options Exchanged				20,484,001
Number of New $10.00 Options issued in the Option Exchange Program	12,485,000	21,495,000	1,582,000		6,828,025	10,242,002

Net number of share options (or share units) granted during the period.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(d)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration