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Inventory (Tables)
3 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of the following components:
December 31,September 30,
20212021
Raw materials$6,030 $5,819 
Work in process7,639 6,848 
Finished goods1,469 1,554 
Parts and supplies58,628 54,352 
Total inventories$73,766 $68,573