v3.25.2
Inventories - Additional Information (Detail) - USD ($)
6 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Inventory [Line Items]      
Slow moving and obsolete inventory reserve $ 14,250,000 $ 13,331,000 $ 1,293,000
Inventory, LIFO reserve, period charge $ 919,000    
Three to Four Years Old Inventory [Member]      
Inventory [Line Items]      
Cost basis reduction in inventory, percentage 50.00%    
Inventory, minimum time period on the shelf, years 3 years    
Inventory, maximum time period on the shelf, years 4 years    
Four to Five Years Old Inventory [Member]      
Inventory [Line Items]      
Cost basis reduction in inventory, percentage 75.00%    
Inventory, minimum time period on the shelf, years 4 years    
Inventory, maximum time period on the shelf, years 5 years    
Greater Than Five Years Old Inventory [Member]      
Inventory [Line Items]      
Inventory, minimum time period on the shelf, years 5 years    
Inventory valuation estimate $ 0