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Unaudited Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (51,362)	$ (70,431)
Other comprehensive income, net of income taxes:
Net change related to employee benefit plans, net of income taxes of $(0.1) million for the three months ended December 31, 2021 and 2020	394	457
Other comprehensive income	394	457
Comprehensive loss	$ (50,968)	$ (69,974)

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