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Inventories - Net Inventories (Detail) - USD ($)
Jun. 30, 2023
Sep. 30, 2022
Inventory, Net [Abstract]    
Raw materials $ 36,672,000 $ 31,975,000
Work in process 17,976,000 13,903,000
Finished goods 12,143,000 9,937,000
Inventories, net $ 66,791,000 $ 55,815,000