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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (420,540)	$ 60,891	$ (389,935)	$ 79,850
Other comprehensive income, net of income taxes:
Minimum pension liability adjustments, net of income taxes of ($0.2) million and ($0.3) million for the three and six months ended March 31, 2020, respectively, and ($0.1) million and ($0.1) million for the three and six months ended March 31, 2019, respectively	516	224	1,032	449
Other comprehensive income	516	224	1,032	449
Comprehensive income (loss)	$ (420,024)	$ 61,115	$ (388,903)	$ 80,299

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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