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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Contract With Customer Liability [Line Items]
Current contract liabilities	$ 25,850	$ 29,527
Noncurrent contract liabilities	396,629	386,324
Deferred Revenue From Material Rights From GE Joint Venture Formation [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities	5,508	4,771
Noncurrent contract liabilities	235,763	234,237
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities	1,288	4,192
Noncurrent contract liabilities	39	290
Liability Related To Customer Supplied Inventory [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities	12,657	14,169
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities	6,397	6,395
Noncurrent contract liabilities	$ 160,827	$ 151,797

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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