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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (55,555)	$ (45,599)	$ (246,989)	$ (435,534)
Other comprehensive income, net of income taxes:
Minimum pension liability adjustments, net of income taxes of $(0.2) million and $(0.5) million for the three and nine months ended June 30, 2021, respectively, and $(0.3) million and $(0.6) million for the three and nine months ended June 30, 2020, respectively	460	521	1,374	1,553
Other comprehensive income	460	521	1,374	1,553
Comprehensive loss	$ (55,095)	$ (45,078)	$ (245,615)	$ (433,981)

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