Deferred Revenue (Details) - Conversion Services Agreement $ in Thousands, lb in Millions		12 Months Ended
	Nov. 17, 2006 USD ($) lb	Sep. 30, 2019 lb
Deferred revenue
Term of agreement to provide conversion services	20 years
Up-front/advance payment received	$ 50,000
Up Front Fees Received	$ 50,000
Additional volume of titanium metal to be converted on exercise of option by service receiver (in pounds) | lb	10
Liquidated damages	$ 25,000
Revenue recognition period	20 years	20 years
Maximum
Deferred revenue
Annual volume of titanium metal to be converted (in pounds) | lb	10	10
Amount of loan offered by counterparty	$ 12,000