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Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands	Feb. 28, 2021	May 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 21,237	$ 23,308
Work in process	8,508	8,318
Finished goods	19,261	28,279
Inventories	$ 49,006	$ 59,905

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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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-Name Accounting Standards Codification
-Topic 210
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-Section S99
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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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Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer.

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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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