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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | $ 31,567 | $ 30,663
Noncurrent contract liabilities | 412,608 | 396,345
Deferred Revenue From Material Rights From GE Joint Venture Formation [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 6,049 | 5,754
Noncurrent contract liabilities | 235,686 | 234,516
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 4,771 | 4,120
Noncurrent contract liabilities | 3,277 | 38
Liability Related To Customer Supplied Inventory [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 12,841 | 12,442
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 7,906 | 8,347
Noncurrent contract liabilities | $ 173,645 | $ 161,791

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