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Inventory (Tables)
6 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of the following components:
March 31,September 30,
20222021
Raw materials$7,877 $5,819 
Work in process7,528 6,848 
Finished goods1,758 1,554 
Parts and supplies68,736 54,352 
Total inventories$85,899 $68,573