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Inventories - Net Inventories (Detail) - USD ($)
Sep. 30, 2024
Sep. 30, 2023
Inventory, Net [Abstract]    
Raw materials $ 32,631,000 $ 35,918,000
Work in process 18,740,000 22,923,000
Finished goods 12,391,000 12,686,000
Inventories, net $ 63,762,000 $ 71,527,000