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Other (Income), Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Component Of Other Expense Income Nonoperating [Line Items]
Royalty (income) expense, net	$ (378)rpm_RoyaltyIncomeNet	$ (709)rpm_RoyaltyIncomeNet	$ (1,595)rpm_RoyaltyIncomeNet	$ (391)rpm_RoyaltyIncomeNet
(Income) related to unconsolidated equity affiliates	(664)	(782)	(1,269)	(1,534)
Other (income), net	$ (1,042)us-gaap_OtherNonoperatingIncomeExpense	$ (1,491)us-gaap_OtherNonoperatingIncomeExpense	$ (2,864)us-gaap_OtherNonoperatingIncomeExpense	$ (1,925)us-gaap_OtherNonoperatingIncomeExpense

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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