Revenue (Schedule of Contract Liability) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Contract With Customer Liability [Line Items]
Current contract liabilities	$ 56,791	$ 33,748
Noncurrent contract liabilities	424,609	414,657
Deferred Revenue from Material Rights from JV Formation [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities	6,580	6,147
Noncurrent contract liabilities	232,164	233,997
Deferred Revenue From Advance Invoicing And/Or Prepayments From Customers [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities	23,706	6,868
Noncurrent contract liabilities	6,437	2,196
Liability Related To Customer Supplied Inventory [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities	20,563	14,543
Deferred Revenue From Material Rights Related To Engineering And Development Funding [Member]
Contract With Customer Liability [Line Items]
Current contract liabilities	5,942	6,190
Noncurrent contract liabilities	$ 186,008	$ 178,464