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Acquisition, Restructuring and Other Items, net (Details 2) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2018	May 31, 2017
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning of period	$ 962	$ 0
Charges	4,674	1,348
Non-cash adjustments	(276)	(108)
Cash payments	(4,289)	(278)
Restructuring Reserve, end of period	1,071	962
Termination Benefits
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning of period	851	0
Charges	1,440	851
Non-cash adjustments	0	0
Cash payments	(1,453)	0
Restructuring Reserve, end of period	838	851
Plant Consolidation
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning of period	111	0
Charges	2,892	494
Non-cash adjustments	(276)	(108)
Cash payments	(2,706)	(275)
Restructuring Reserve, end of period	21	111
Regulatory Filings
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning of period	0	0
Charges	68	0
Non-cash adjustments	0	0
Cash payments	(56)	0
Restructuring Reserve, end of period	12	0
Contract Cancellation
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning of period	0	0
Charges	200	0
Non-cash adjustments	0	0
Cash payments	0	0
Restructuring Reserve, end of period	200	0
Other Costs
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning of period	0	0
Charges	74	3
Non-cash adjustments	0	0
Cash payments	(74)	(3)
Restructuring Reserve, end of period	$ 0	$ 0

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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