Revenues from Contracts with Customers (Tables)

12 Months Ended

Sep. 30, 2019

Revenues from Contracts with Customers

Schedule of disaggregation of revenue

	Year Ended
	September 30,
	2017		2018		2019
Net revenues (dollars in thousands)
Aerospace	$	192,515	$	226,898	$	258,104
Chemical processing		70,467		79,169		89,651
Industrial gas turbine		61,523		52,350		59,430
Other markets		43,203		53,417		57,946
Total product revenue		367,708		411,834		465,131
Other revenue		27,501		23,492		25,084
Net revenues	$	395,209	$	435,326	$	490,215