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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (494,497)	$ (33,656)	$ 482,672
Other comprehensive income (loss), net of income taxes:
Unrealized appreciation on securities, net of income taxes of $3.3 million at September 30, 2018	0	0	9,001
Minimum pension liability adjustments, net of income taxes of $0.8 million at September 30, 2020, $(3.5) million at September 30, 2019 and $1.9 million at September 30, 2018	2,447	(11,875)	5,249
Other comprehensive income (loss)	2,447	(11,875)	14,250
Comprehensive income (loss)	$ (492,050)	$ (45,531)	$ 496,922

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