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Amounts Recognized in Consolidated Balance Sheets, Postretirement (Detail) (USD $) In Thousands, unless otherwise specified | May 31, 2013 | May 31, 2012
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Postretirement Benefits, U.S. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Current liabilities | $ (642) | $ (714)
Noncurrent liabilities | (7,872) | (8,963)
Net Amount Recognized | (8,514) | (9,677)
Postretirement Benefits, Non-U.S. Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Current liabilities | (486) | (428)
Noncurrent liabilities | (27,929) | (24,089)
Net Amount Recognized | $ (28,415) | $ (24,517)

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- Definition For classified balance sheets this represents the current liability recognized in the balance sheet that is associated with other postretirement defined benefit plans (excluding pension plans). (The current liability will be separate, but it will normally be small, if there is even any at all.) For unclassified balance sheets, this represents the entire liability recognized in the balance sheet that is associated with the plans. + References No definition available. + Details
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Namespace Prefix: | rpm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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 The total amount of the entity's obligation as of the balance sheet date under any other retirement plan(s), such as one or more defined contribution plans. + References No definition available. + Details
Name: | us-gaap_OtherPostretirementBenefitsPayableCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the entity's noncurrent obligation as of the balance sheet date under any other retirement plan(s), such as one or more defined contribution plans. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant