Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Revenue from Contracts with Customers
Net revenues	$ 117,056	$ 82,063	$ 216,486	$ 154,240
Product
Revenue from Contracts with Customers
Net revenues	110,311	77,651	205,301	144,208
Aerospace
Revenue from Contracts with Customers
Net revenues	52,918	30,601	101,373	55,156
Chemical processing
Revenue from Contracts with Customers
Net revenues	22,850	15,068	40,300	30,324
Industrial gas turbine
Revenue from Contracts with Customers
Net revenues	24,788	16,436	39,386	30,403
Other markets
Revenue from Contracts with Customers
Net revenues	9,755	15,546	24,242	28,325
Other
Revenue from Contracts with Customers
Net revenues	$ 6,745	$ 4,412	$ 11,185	$ 10,032