Revenues from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue from Contracts with Customers
Net revenues	$ 153,923	$ 143,901	$ 453,738	$ 429,360
Product
Revenue from Contracts with Customers
Net revenues	145,822	136,641	430,920	409,808
Aerospace
Revenue from Contracts with Customers
Net revenues	82,607	77,456	233,093	208,586
Chemical processing
Revenue from Contracts with Customers
Net revenues	16,267	17,696	54,715	69,016
Industrial gas turbine
Revenue from Contracts with Customers
Net revenues	32,016	28,073	102,986	86,518
Other markets
Revenue from Contracts with Customers
Net revenues	14,932	13,416	40,126	45,688
Others
Revenue from Contracts with Customers
Net revenues	$ 8,101	$ 7,260	$ 22,818	$ 19,552