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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 434,100	$ 6,953	$ (326,150)
Other comprehensive income, net of income taxes:
Net change related to employee benefit plans, net of income taxes of $1.2 million, $2.3 million, and $1.8 million at September 30, 2023, 2022, and 2021, respectively.	4,091	8,172	5,944
Other comprehensive income	4,091	8,172	5,944
Comprehensive income (loss)	$ 438,191	$ 15,125	$ (320,206)

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