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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands | May 31, 2020 | Aug. 31, 2019 | May 31, 2019
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Inventory Disclosure [Abstract] |  |  |
Raw materials and supplies | $ 50,820 | $ 49,047 | $ 44,742
Work in process | 7,819 | 4,514 | 6,917
Finished goods and purchased parts, net | 59,496 | 46,812 | 47,659
Total inventory value before LIFO adjustment | 118,135 | 100,373 | 99,318
Less adjustment to LIFO value | (4,834) | (8,086) | (8,227)
Inventories, net | $ 113,301 | $ 92,287 | $ 91,091

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