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Property, Plant, and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Property, plant and equipment
Property, plant and equipment	$ 89,607	$ 93,163
Less accumulated depreciation and amortization	(48,794)	(49,652)
Property, plant and equipment excluding land and land improvements	40,813	43,511
Land and land improvements	1,648	1,723
Property, plant and equipment, Net	42,461	45,234
Depreciation expense	4,600	6,000	$ 8,200
Building and building improvements
Property, plant and equipment
Property, plant and equipment	39,887	40,597
Machinery and equipment
Property, plant and equipment
Property, plant and equipment	22,668	25,434
Computer software and equipment
Property, plant and equipment
Property, plant and equipment	24,899	25,668
Construction in progress
Property, plant and equipment
Property, plant and equipment	$ 2,153	$ 1,464

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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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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