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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Sep. 30, 2021
--- | --- | ---
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | $ 25,850 | $ 29,527
Noncurrent contract liabilities | 396,629 | 386,324
Deferred Revenue From Material Rights From GE Joint Venture Formation [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 5,508 | 4,771
Noncurrent contract liabilities | 235,763 | 234,237
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 1,288 | 4,192
Noncurrent contract liabilities | 39 | 290
Liability Related To Customer Supplied Inventory [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 12,657 | 14,169
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 6,397 | 6,395
Noncurrent contract liabilities | $ 160,827 | $ 151,797

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