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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Aug. 31, 2022 | Aug. 31, 2021
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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

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