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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

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