Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue from Contracts with Customers
Net revenues	$ 130,165	$ 88,143	$ 346,651	$ 242,383
Product
Revenue from Contracts with Customers
Net revenues	123,670	82,504	328,971	226,712
Aerospace
Revenue from Contracts with Customers
Net revenues	60,981	33,950	162,354	89,106
Chemical processing
Revenue from Contracts with Customers
Net revenues	24,180	17,010	64,480	47,334
Industrial gas turbine
Revenue from Contracts with Customers
Net revenues	23,991	17,835	63,377	48,238
Other markets
Revenue from Contracts with Customers
Net revenues	14,518	13,709	38,760	42,034
Other
Revenue from Contracts with Customers
Net revenues	$ 6,495	$ 5,639	$ 17,680	$ 15,671