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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Sep. 30, 2018
Contract With Customer Liability [Line Items]
Current contract liabilities		$ 30,531	$ 9,659
Noncurrent contract liabilities	[1]	331,264	235,300
Deferred Revenue From Material Rights From GE Joint Venture Formation [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities		6,897	7,087
Noncurrent contract liabilities		235,961	235,300
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities		4,766	$ 2,572
Liability Related To Customer Supplied Inventory [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities		17,258
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities		1,610
Noncurrent contract liabilities		$ 95,303
[1] See Note 3, Revenue, for more information on net noncurrent contract liabilities.

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