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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | $ 48,821 | $ 33,748
Noncurrent contract liabilities | 426,810 | 414,657
Deferred Revenue From Material Rights From GE Joint Venture Formation [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 6,364 | 6,147
Noncurrent contract liabilities | 235,837 | 233,997
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 17,414 | 6,868
Noncurrent contract liabilities | 4,333 | 2,196
Liability Related To Customer Supplied Inventory [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 17,941 | 14,543
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 7,102 | 6,190
Noncurrent contract liabilities | $ 186,640 | $ 178,464

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