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Inventories - Additional Information (Detail) - USD ($)
3 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Inventory [Line Items]    
Slow moving and obsolete inventory reserve $ 4,966,000 $ 4,617,000
Raw materials 25,430,000 $ 14,607,000
Blaw Know [Member]    
Inventory [Line Items]    
Raw materials $ 11,000,000.0  
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