Summary Of Significant Accounting Policies (Consolidated Statements Of Cash Flows) (Details) - USD ($) $ in Thousands	Dec. 31, 2022		Sep. 30, 2022		Dec. 31, 2021	Sep. 30, 2021
Cash and Cash Equivalents [Line Items]
Cash and Temporary Cash Investments	$ 244,475		$ 46,048		$ 79,065	$ 31,528
Hedging Collateral Deposits	1,600	[1]	91,670	[1]	0	88,610
Cash, Cash Equivalents and Restricted Cash	$ 246,075		$ 137,718		$ 79,065	$ 120,138

[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.