Summary Of Significant Accounting Policies (Consolidated Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	Mar. 31, 2022		Sep. 30, 2021		Mar. 31, 2021	Sep. 30, 2020
Cash and Cash Equivalents [Line Items]
Cash and Temporary Cash Investments	$ 52,569		$ 31,528		$ 80,467	$ 20,541
Hedging Collateral Deposits	102,370	[1]	88,610	[1]	0	0
Cash, Cash Equivalents and Restricted Cash	$ 154,939		$ 120,138		$ 80,467	$ 20,541

[1] Netting Adjustments represent the impact of legally-enforceable master netting arrangements that allow the Company to net gain and loss positions held with the same counterparties. The net asset or net liability for each counterparty is recorded as an asset or liability on the Company’s balance sheet.