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INVESTMENT (INCOME) EXPENSE, NET | 3 Months Ended
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Aug. 31, 2012
INVESTMENT (INCOME) EXPENSE, NET | NOTE 10 — INVESTMENT (INCOME) EXPENSE, NET Investment (income) expense, net, consists of the following components:
|  | Quarter Ended August 31, |
(In thousands) |  | 2012 |  |  | 2011 |
Interest (income) |  | $ | (2,295 | ) |  | $ | (1,117 | )
(Gain) loss on sale of marketable securities |  |  | (4,584 | ) |  |  | 914 |
Other-than-temporary impairment on securities |  |  | 113 |  |  |  | 406 |
Dividend (income) |  |  | (208 | ) |  |  | (227 | )
Investment (income) expense, net |  | $ | (6,974 | ) |  | $ | (24 | )

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- Definition Disclosure of Other Nonoperating Income. + References No definition available. + Details
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Namespace Prefix: | rpm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration