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Derivative Instruments and Hedging Activities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
Effects on Consolidated Balance Sheets
Asset derivatives	$ 16,984	$ 43,157
Liability derivatives	12,903	108,692
Designated as Hedging Instrument [Member] \| Interest rate swap [Member]
Effects on Consolidated Balance Sheets
Asset derivatives	4,227	5,959
Liability derivatives		69,103
Not Designated as Hedging Instrument [Member] \| Forward Exchange Contract [Member]
Effects on Consolidated Balance Sheets
Asset derivatives	12,757	37,198
Liability derivatives	$ 12,903	$ 39,589

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details