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Property, Plant, and Equipment, at Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014	Feb. 28, 2015	Nov. 30, 2014	Aug. 31, 2014	May 31, 2013
Property, plant and equipment
Property, plant and equipment	$ 90,097	$ 88,943
Less accumulated depreciation and amortization	(43,536)	(36,197)
Property, plant and equipment excluding land and land improvements	46,561	52,746
Land and land improvements	1,723	1,704
Property, plant and equipment, Net	48,284	54,450	$ 66,455	$ 58,215	$ 66,723	$ 66,189	$ 62,375
Depreciation expense	8,200	9,800	8,400
Additional depreciation due to change in useful life	1,000	1,500	$ 800
Building and building improvements
Property, plant and equipment
Property, plant and equipment	39,585	33,853
Machinery and equipment
Property, plant and equipment
Property, plant and equipment	24,078	23,626
Computer software and equipment
Property, plant and equipment
Property, plant and equipment	24,691	24,431
Construction in progress
Property, plant and equipment
Property, plant and equipment	$ 1,743	$ 7,033

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Property plant and equipment excluding land and land improvements.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount before accumulated deprecation and depletion of real estate held for productive use and additions or improvements to real estate held for productive use, examples include, but are not limited to, walkways, driveways, fences, and parking lots. Excludes land held for sale.

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