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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Sep. 30, 2025
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Contract With Customer Liability [Line Items] |  |
Current contract liabilities | $ 60,667 | $ 49,235
Noncurrent contract liabilities | 417,211 | 431,458
Deferred Revenue From Material Rights From JV Formation [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 7,689 | 7,298
Noncurrent contract liabilities | 230,266 | 229,878
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 21,672 | 14,944
Noncurrent contract liabilities | 569 | 2,115
Liability Related To Customer Supplied Inventory [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 22,226 | 19,640
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 9,080 | 7,353
Noncurrent contract liabilities | $ 186,376 | $ 199,465

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