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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
--- | --- | ---
Contract With Customer Liability [Line Items] |  |  |
Current contract liabilities |  | $ 25,601 | $ 27,891
Noncurrent contract liabilities | [1] | 352,440 | 337,165
Deferred Revenue From Material Rights From GE Joint Venture Formation [Member] |  |  |
Contract With Customer Liability [Line Items] |  |  |
Current contract liabilities |  | 4,712 | 8,317
Noncurrent contract liabilities |  | 235,558 | 230,588
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member] |  |  |
Contract With Customer Liability [Line Items] |  |  |
Current contract liabilities |  | 4,572 | 4,554
Noncurrent contract liabilities |  | 129 | 141
Liability Related To Customer Supplied Inventory [Member] |  |  |
Contract With Customer Liability [Line Items] |  |  |
Current contract liabilities |  | 13,884 | 13,396
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member] |  |  |
Contract With Customer Liability [Line Items] |  |  |
Current contract liabilities |  | 2,433 | 1,624
Noncurrent contract liabilities |  | $ 116,753 | $ 106,436
[1] | See Note 3, Revenue, for more information on net noncurrent contract liabilities.

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