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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands | Feb. 28, 2019 | Aug. 31, 2018 | Feb. 28, 2018
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Inventory Disclosure [Abstract] |  |  |
Raw materials and supplies | $ 47,573 | $ 36,316 | $ 38,716
Work in process | 8,715 | 9,176 | 9,371
Finished goods and purchased parts | 51,910 | 40,197 | 60,925
Total inventory value before LIFO adjustment | 108,198 | 85,689 | 109,012
Less adjustment to LIFO value | (8,214) | (6,456) | (6,037)
Inventories, net | $ 99,984 | $ 79,233 | $ 102,975

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