FAIR VALUE, Gains and Losses (Realized and Unrealized) Included in Revenues (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Other Comprehensive Income
Gains and Losses (Realized and Unrealized) Included in Revenues [Line Items]
Total (losses) gains included in revenues	$ 0	$ 0	$ 0	$ 0
Change in unrealized gains for assets held at the end of the reporting period	(883)	3,561	(9,268)	1,595
Net trading profits
Gains and Losses (Realized and Unrealized) Included in Revenues [Line Items]
Total (losses) gains included in revenues	(197)	(20)	(486)	(35)
Change in unrealized gains for assets held at the end of the reporting period	(60)	0	(110)	5
Other revenues
Gains and Losses (Realized and Unrealized) Included in Revenues [Line Items]
Total (losses) gains included in revenues	6,006	14,271	2,721	18,577
Change in unrealized gains for assets held at the end of the reporting period	$ 5,873	$ 14,244	$ 2,588	$ 18,550

[Line Items] for Gains and Losses (Realized and Unrealized) Included in Earnings [Table]

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- Definition

Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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=36462937&loc=d3e19207-110258

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