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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | $ 28,760 | $ 24,620
Noncurrent contract liabilities | 376,806 | 366,642
Deferred Revenue From Material Rights From GE Joint Venture Formation [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 4,419 | 4,066
Noncurrent contract liabilities | 236,610 | 234,240
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 3,922 | 3,239
Noncurrent contract liabilities | 716 | 85
Liability Related To Customer Supplied Inventory [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 15,790 | 14,955
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 4,629 | 2,360
Noncurrent contract liabilities | $ 139,480 | $ 132,317

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