Inventory (Tables)

6 Months Ended

Mar. 31, 2023

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consist of the following components:

	March 31,		September 30,
	2023		2022
Raw materials	$	13,356	$	12,504
Work in process		11,795		8,218
Finished goods		2,325		2,129
Parts and supplies		78,835		73,482
Total inventories	$	106,311	$	96,333