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Other (Income), Net (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Component Of Other Expense Income Nonoperating [Line Items]        
Royalty (income) expense, net $ (130)rpm_RoyaltyIncomeNet $ (433)rpm_RoyaltyIncomeNet $ (1,725)rpm_RoyaltyIncomeNet $ (824)rpm_RoyaltyIncomeNet
(Income) related to unconsolidated equity affiliates (530)us-gaap_IncomeLossFromEquityMethodInvestments (920)us-gaap_IncomeLossFromEquityMethodInvestments (1,799)us-gaap_IncomeLossFromEquityMethodInvestments (2,454)us-gaap_IncomeLossFromEquityMethodInvestments
Other (income), net $ (660)us-gaap_OtherNonoperatingIncomeExpense $ (1,353)us-gaap_OtherNonoperatingIncomeExpense $ (3,524)us-gaap_OtherNonoperatingIncomeExpense $ (3,278)us-gaap_OtherNonoperatingIncomeExpense