Summary Of Significant Accounting Policies (Schedule Of Net Realized And Unrealized Gains And Losses On Derivative Contracts) (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Summary Of Significant Accounting Policies [Line Items]
Net realized and unrealized (gains) losses	$ 2,825	$ 1,674
Forward Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Net realized and unrealized (gains) losses	$ (1,530)	$ 1,894

Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4F
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624186-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41322-113958

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Balance Type:	credit
Period Type:	duration