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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | $ 49,665 | $ 33,748
Noncurrent contract liabilities | 420,328 | 414,657
Deferred Revenue From Material Rights From GE Joint Venture Formation [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 6,472 | 6,147
Noncurrent contract liabilities | 234,159 | 233,997
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 18,454 | 6,868
Noncurrent contract liabilities | 3,258 | 2,196
Liability Related To Customer Supplied Inventory [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 19,198 | 14,543
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 5,541 | 6,190
Noncurrent contract liabilities | $ 182,911 | $ 178,464

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