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Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Sep. 30, 2019
Contract With Customer Liability [Line Items]
Current contract liabilities		$ 30,222	$ 27,891
Noncurrent contract liabilities	[1]	356,175	337,165
Deferred Revenue From Material Rights From GE Joint Venture Formation [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities		3,866	8,317
Noncurrent contract liabilities		235,602	230,588
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities		6,869	4,554
Noncurrent contract liabilities		106	141
Liability Related To Customer Supplied Inventory [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities		17,799	13,396
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities		1,688	1,624
Noncurrent contract liabilities		$ 120,467	$ 106,436
[1] See Note 3, Revenue, for more information on net noncurrent contract liabilities

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+ References

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