Financial Instruments - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Increase (decrease) in fair value:
Interest rate agreements	$ 29,650	$ (29,937)	$ (18,091)	$ (7,276)
Recognition of (gains) losses in earnings due to settlements:
Interest rate agreements	(2,492)	(530)	(4,983)	(1,060)
Total other comprehensive income (loss) from hedging, net of tax	$ 27,158	$ (30,467)	$ (23,074)	$ (8,336)

Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness, attributable to parent.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-11

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