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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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