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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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Contract With Customer Liability [Line Items] |  |
Current contract liabilities | $ 49,235 | $ 56,791
Noncurrent contract liabilities | 431,458 | 424,609
Deferred Revenue From Material Rights From JV Formation [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 7,298 | 6,580
Noncurrent contract liabilities | 229,878 | 232,164
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 14,944 | 23,706
Noncurrent contract liabilities | 2,115 | 6,437
Liability Related To Customer Supplied Inventory [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 19,640 | 20,563
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 7,353 | 5,942
Noncurrent contract liabilities | $ 199,465 | $ 186,008

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