XML 79 R83.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Accumulated Other Comprehensive Income (loss) (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
May 31, 2014 | May 31, 2013 | May 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification adjustments for gains included in net income, net of tax (benefit) | $ 586 | $ 633 | $ 844

X
- Definition Other Comprehensive Income Reclassification Adjustments And Other Tax + References No definition available. + Details
Name: | rpm_OtherComprehensiveIncomeReclassificationAdjustmentsAndOtherTax
Namespace Prefix: | rpm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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