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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands | Nov. 30, 2021 | Aug. 31, 2021 | Nov. 30, 2020
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Inventory Disclosure [Abstract] |  |  |
Raw materials and supplies | $ 78,102 | $ 69,962 | $ 52,374
Work in process | 12,227 | 8,301 | 8,041
Finished goods and purchased parts, net | 90,676 | 75,053 | 58,284
Total inventory value before LIFO adjustment | 181,005 | 153,316 | 118,699
Less adjustment to LIFO value | (7,890) | (8,072) | (4,421)
Inventories, net | $ 173,115 | $ 145,244 | $ 114,278

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