Debt - Schedule of Debt (Parenthetical) (Detail)	1 Months Ended		1 Months Ended
Oct. 31, 2012 Senior notes [Member]	Sep. 30, 2012 Senior notes [Member]	Oct. 31, 2012 Other committed and uncommitted revolving credit facilities, expiring on various dates through fiscal 2013 [Member]	Jan. 31, 2012 Other committed and uncommitted revolving credit facilities, expiring on various dates through fiscal 2013 [Member]
Debt Disclosure [Line Items]
Revolving credit loans, interest rateat the bottom	3.75%	3.75%	4.37%	6.27%
Debt maturity date	Sep. 21, 2017
Debt instrument expiration year			2015

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

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

Reference 3: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration