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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | $ 29,385 | $ 24,620
Noncurrent contract liabilities | 371,024 | 366,642
Deferred Revenue From Material Rights From GE Joint Venture Formation [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 4,242 | 4,066
Noncurrent contract liabilities | 232,882 | 234,240
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 4,182 | 3,239
Noncurrent contract liabilities | 1,338 | 85
Liability Related To Customer Supplied Inventory [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 16,885 | 14,955
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 4,076 | 2,360
Noncurrent contract liabilities | $ 136,804 | $ 132,317

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