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Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands	Nov. 30, 2021	May 31, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 26,706	$ 22,925
Work in process	6,673	8,022
Finished goods	14,804	17,667
Inventories	$ 48,183	$ 48,614

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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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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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