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Investment (Income) Expense, Net (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2012 | Nov. 30, 2011 | Nov. 30, 2012 | Nov. 30, 2011
Component of Other Income, Nonoperating [Line Items] |  |  |  |  |  |
Interest (income) | $ (1,565) |  | $ (1,116) | $ (3,860) |  | $ (2,233)
(Gain) loss on sale of marketable securities | (8) |  | (22) | (4,592) |  | 892
Other-than-temporary impairment on securities | 450 |  | 341 | 564 |  | 749
Dividend (income) | (241) |  | (248) | (450) |  | (477)
Investment (income) expense, net | $ (1,364) | [1] | $ (1,045) | $ (8,338) | [1] | $ (1,069)
[1] | Restated

X
- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. + References No definition available. + Details
Name: | rpm_GainLossOnSecuritiesInvestmentsNet
Namespace Prefix: | rpm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively, net of related investment expenses. This item also includes realized gains or losses on sales of investments in debt and equity securities, and other than temporary losses related to investments in debt and equity securities during the period. This account does not include investment income from real or personal property, such as rental income. + References No definition available. + Details
Name: | rpm_NetInvestmentIncomeAndOtherIncome
Namespace Prefix: | rpm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of dividend income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
Name: | us-gaap_InvestmentIncomeDividend
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition This element represents the amount of loss recognized for other than temporary impairments (OTTI) of investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.M) -URI http://asc.fasb.org/extlink&oid=27011274&loc=d3e87990-122713 + Details
Name: | us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration