Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Aug. 31, 2022	Aug. 31, 2021
Property, Plant and Equipment [Line Items]
Total operating property, plant and equipment	$ 194,718	$ 183,926
Accumulated depreciation	(120,816)	(116,856)
Total operating property, plant, and equipment, net	73,902	67,070
Machines	16,359	15,135
Barriers	29,904	29,939
Total property held for lease	46,263	45,074
Accumulated depreciation	(25,693)	(20,147)
Total property held for lease, net	20,570	24,927
Property, plant, and equipment, net	94,472	91,997
Land [Member]
Property, Plant and Equipment [Line Items]
Total operating property, plant and equipment	5,997	7,970
Building [Member]
Property, Plant and Equipment [Line Items]
Total operating property, plant and equipment	51,014	49,308
Machinery And Equipment [Member]
Property, Plant and Equipment [Line Items]
Total operating property, plant and equipment	93,558	87,765
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total operating property, plant and equipment	7,994	7,978
Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Total operating property, plant and equipment	25,948	24,569
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total operating property, plant and equipment	$ 10,207	$ 6,336