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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (326,150)	$ (494,497)	$ (33,656)
Other comprehensive income (loss), net of income taxes:
Net change related to employee benefit plans, net of income taxes of $1.8 million at September 30, 2021, $0.8 million at September 30, 2020 and $(3.5) million at September 30, 2019	5,944	2,447	(11,875)
Other comprehensive income (loss)	5,944	2,447	(11,875)
Comprehensive loss	$ (320,206)	$ (492,050)	$ (45,531)

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