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Other Expense (Income), Net (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Other Income And Expenses [Abstract]
Royalty expense, net	$ 3	$ 268
(Income) related to unconsolidated equity affiliates	(118)	(273)
Pension non-service costs	428
Other expense (income), net	$ 313	$ (5)

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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