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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 17,752	$ (55,555)	$ (38,586)	$ (246,989)
Other comprehensive income, net of income taxes:
Net change related to employee benefit plans, net of income taxes of $(41.7) thousand and $(0.3) million for the three and nine months ended June 30, 2022, respectively, and $(0.2) million and $(0.5) million for the three and nine months ended June 30, 2021.	389	460	1,177	1,374
Other comprehensive income	389	460	1,177	1,374
Comprehensive income (loss)	$ 18,141	$ (55,095)	$ (37,409)	$ (245,615)

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