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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Thousands	May 31, 2021	Aug. 31, 2020	May 31, 2020
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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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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