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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Aug. 31, 2021
Aug. 31, 2020
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment $ 183,926 $ 168,247
Accumulated depreciation (116,856) (110,389)
Total operating property, plant, and equipment, net 67,070 57,858
Machines 15,135 12,457
Barriers 29,939 27,403
Total property held for lease 45,074 39,860
Accumulated depreciation (20,147) (18,137)
Total property held for lease, net 24,927 21,723
Property, plant, and equipment, net 91,997 79,581
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment 7,970 2,639
Building [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment 49,308 40,730
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment 87,765 85,185
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment 7,978 8,089
Computer Hardware and Software [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment 24,569 20,927
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total operating property, plant and equipment $ 6,336 $ 10,677