DERIVATIVE FINANCIAL INSTRUMENTS Balance Sheet Location (Details) (Not Designated as Hedging Instrument [Member], USD $) In Thousands	Jun. 30, 2011		Sep. 30, 2010
Interest Rate Contracts [Member] | Trading Instruments Sold [Member]
Liability Derivatives
Notional Amount	$ 1,444,967		$ 1,172,927
Fair Value	65,292	[1]	86,039	[1]
Interest Rate Contracts [Member] | Other Assets [Member]
Asset Derivatives
Notional Amount	500,000		1,500,000
Fair Value	0		0
Interest Rate Contracts [Member] | Trading Instruments [Member]
Asset Derivatives
Notional Amount	1,880,872		1,130,767
Fair Value	84,171	[1]	102,490	[1]
Loan Commitments [Member] | Trade and Other Payables [Member]
Liability Derivatives
Notional Amount	5,320		15,523
Fair Value	$ 14	[1]	$ 105	[1]

[1] The fair value in this table is presented on a gross basis before netting of cash collateral and by counterparty according to our legally enforceable master netting arrangements. The fair value in the Condensed Consolidated Statements of Financial Condition is presented net.