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Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2016	May 31, 2015	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May 31, 2014
Inventories
Raw materials	$ 21,669	$ 28,040
Work in process	10,700	11,910
Finished goods	23,001	27,438
Total	55,370	67,388	$ 68,767	$ 75,372	$ 71,306	$ 61,740
Inventory valuation reserve	12,600	$ 7,800
Inventory write-off	$ 5,800

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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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