Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Other Credit Arrangements - Additional Information (Detail) In Millions, unless otherwise specified	Jan. 28, 2012 Entity	Jan. 28, 2012 Currency, U.S. Dollar USD ($)	Jan. 28, 2012 Currency, U.S. Dollar Demand letter of credit facilities USD ($)	Jan. 28, 2012 Currency, U.S. Dollar Demand line borrowings USD ($)	Jan. 28, 2012 Currency, U.S. Dollar Letters of credit or demand line borrowings USD ($)	Jan. 28, 2012 Currency, Canadian Dollar CAD	Jan. 28, 2012 Currency, Canadian Dollar Demand line borrowings CAD
Debt Disclosure [Line Items]
Borrowing agreements, number of financial institutions	4
Borrowing agreements with financial institutions		$ 245.0	$ 135.0	$ 50.0	$ 60.0	25.0	25.0
Outstanding borrowings			$ 25.2	$ 0