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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands | Feb. 28, 2021 | Aug. 31, 2020 | Feb. 29, 2020
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Inventory Disclosure [Abstract] |  |  |
Raw materials and supplies | $ 62,404 | $ 51,205 | $ 50,240
Work in process | 8,993 | 6,464 | 6,746
Finished goods and purchased parts, net | 58,682 | 51,684 | 53,496
Total inventory value before LIFO adjustment | 130,079 | 109,353 | 110,482
Less adjustment to LIFO value | (8,513) | (4,561) | (5,028)
Inventories, net | $ 121,566 | $ 104,792 | $ 105,454

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