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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Aug. 31, 2023
Aug. 31, 2022
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment $ 206,945 $ 194,718
Accumulated depreciation (130,923) (120,816)
Total operating property, plant, and equipment, net 76,022 73,902
Machines 16,398 16,359
Barriers 34,398 29,904
Total property held for lease 50,796 46,263
Accumulated depreciation (27,137) (25,693)
Total property held for lease, net 23,659 20,570
Property, plant, and equipment, net 99,681 94,472
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment 6,144 5,997
Building [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment 57,606 51,014
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment 99,466 93,558
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment 8,807 7,994
Computer Hardware and Software [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment 26,684 25,948
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment $ 8,238 $ 10,207