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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | $ 28,813 | $ 29,527
Noncurrent contract liabilities | 396,175 | 386,324
Deferred Revenue From Material Rights From GE Joint Venture Formation [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 5,262 | 4,771
Noncurrent contract liabilities | 236,913 | 234,237
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 2,668 | 4,192
Noncurrent contract liabilities | 37 | 290
Liability Related To Customer Supplied Inventory [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 13,654 | 14,169
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member] |  |
Contract With Customer Liability [Line Items] |  |
Current contract liabilities | 7,229 | 6,395
Noncurrent contract liabilities | $ 159,225 | $ 151,797

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