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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands | May 31, 2021 | Aug. 31, 2020 | May 31, 2020
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Inventory Disclosure [Abstract] |  |  |
Raw materials and supplies | $ 64,087 | $ 51,205 | $ 50,820
Work in process | 9,440 | 6,464 | 7,819
Finished goods and purchased parts, net | 71,414 | 51,684 | 59,496
Total inventory value before LIFO adjustment | 144,941 | 109,353 | 118,135
Less adjustment to LIFO value | (8,340) | (4,561) | (4,834)
Inventories, net | $ 136,601 | $ 104,792 | $ 113,301

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