Revenues from Contracts with Customers - Other Information (Details) $ in Thousands, lb in Millions		9 Months Ended
	Nov. 17, 2006 USD ($)	Jun. 30, 2023 USD ($) lb	Sep. 30, 2022 USD ($)
Revenues from Contracts with Customers
Accounts receivable, gross		$ 88,603	$ 95,340
Accounts receivable, allowance for doubtful accounts		858	428
Contract liabilities		8,454	10,329
Estimated product returns		$ 790	$ 700
Conversion Services Arrangement
Revenues from Contracts with Customers
Revenue recognition period		20 years
Advance payments received	$ 50,000
Conversion Services Arrangement | Maximum
Revenues from Contracts with Customers
Annual volume of titanium metal to be converted (in pounds) | lb		10