Income Taxes Income Taxes - Provision for Income Taxes Charged To Income From Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017
Provision for Income Taxes [Line Items]
Current Federal Tax Expense (Benefit)	$ 0	$ 0			$ 0	$ 0
Income (Loss) from Continuing Operations before Income Taxes, Domestic	(57,408)	13,104			(120,812)	310,846
Current Income Tax Expense (Benefit)	28,157	3,189			31,097	4,187
Deferred Foreign Income Tax Expense (Benefit)	165	(1,194)			(784)	413
Deferred Income Tax Expense (Benefit)	165	(1,194)			(784)	413
Income Tax Expense (Benefit)	28,322	1,995	$ 30,313	$ 4,600	30,313	4,600
Income (Loss) from Continuing Operations before Income Taxes, Foreign	(42,699)	(6,796)			(20,505)	3,771
Pre-tax income (loss)	(100,107)	6,308	$ (141,317)	$ 314,617	(141,317)	314,617
Current State and Local Tax Expense (Benefit)	284	645			(3,242)	1,682
Current Foreign Tax Expense (Benefit)	$ 27,873	$ 2,544			$ 34,339	$ 2,505