Financial Instruments - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Increase (decrease) in fair value:
Interest rate agreements	$ 16,926	$ 44,057	$ (1,165)	$ 36,781
Recognition of (gains) losses in earnings due to settlements:
Interest rate agreements	(2,490)	(530)	(7,473)	(1,590)
Total other comprehensive income (loss) from hedging, net of tax	$ 14,436	$ 43,527	$ (8,638)	$ 35,191

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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