Fair Value of Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Minimum
Fair Value Measurements
Performance risk for derivative contracts as a percentage of unadjusted liabilities	14.10%
Maximum
Fair Value Measurements
Performance risk for derivative contracts as a percentage of unadjusted liabilities	17.00%
Weighted average
Fair Value Measurements
Performance risk for derivative contracts as a percentage of unadjusted liabilities	15.40%
Net investment hedges
Level 3 activity
Beginning balance:	$ (24,862)	$ (11,126)
Unrealized loss on cross hedging instruments	(1,016)	(141)
Ending balance:	$ (25,878)	$ (11,267)

Amount of gain (loss) recognized in earnings, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (level 3).

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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:monetaryItemType
Balance Type:	credit
Period Type:	duration