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, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Increase (decrease) in fair value:
Interest rate agreements	$ (1,678)	$ 29,650	$ 18,041	$ (18,091)
Recognition of (gains) losses in earnings due to settlements:
Interest rate agreements	(3,982)	(2,492)	(7,140)	(4,983)
Total other comprehensive income (loss) from hedging, net of tax	$ (5,660)	$ 27,158	$ 10,901	$ (23,074)

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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