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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 6,953	$ (326,150)	$ (494,497)
Other comprehensive income, net of income taxes:
Net change related to employee benefit plans, net of income taxes of $2.3 million at September 30, 2022, $1.8 million at September 30, 2021 and $0.8 million at September 30, 2020	8,172	5,944	2,447
Other comprehensive income	8,172	5,944	2,447
Comprehensive income (loss)	$ 15,125	$ (320,206)	$ (492,050)

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