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Specialty Products Holding Corp. ("SPHC") - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
May 31, 2010
Feb. 28, 2015
May 31, 2014
Reorganization [Line Items]      
Carrying value of retained interest in SPHC $ 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures    
Net loss from deconsolidation of business (7,900,000)us-gaap_DeconsolidationGainOrLossAmount    
Amount funded for trust as per agreement   450,000,000us-gaap_BankruptcyClaimsAmountOfClaimsUnderReviewByManagement  
Revolving credit facility, maximum borrowing capacity   800,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Initial payment for long term debt   450,000,000us-gaap_RepaymentsOfLongTermDebt  
Business combination, total consideration transferred   772,600,000us-gaap_BusinessCombinationConsiderationTransferred1  
Business acquisition, preliminary fair value of goodwill   1,201,112,000us-gaap_Goodwill 1,147,374,000us-gaap_Goodwill
RPM Holdco      
Reorganization [Line Items]      
Percentage of ownership   21.39%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= rpm_RpmHoldcoMember
 
Business acquisition, allocation of total consideration   208,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= rpm_RpmHoldcoMember
 
Business acquisition, preliminary fair value of goodwill   111,700,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= rpm_RpmHoldcoMember
 
Business acquisition, preliminary fair value of intangible assets   181,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= rpm_RpmHoldcoMember
 
Business acquisition, preliminary fair value of income tax assets   271,700,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= rpm_RpmHoldcoMember
 
Business acquisition, preliminary fair value of net deferred tax liabilities   74,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= rpm_RpmHoldcoMember
 
RPM Holdco | Indefinite-Lived Trade Names      
Reorganization [Line Items]      
Business acquisition, preliminary fair value of intangible assets   55,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= rpm_RpmHoldcoMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= rpm_IndefiniteLivedTradeNamesMember
 
RPM Holdco | Formulas      
Reorganization [Line Items]      
Business acquisition, preliminary fair value of intangible assets   2,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= rpm_RpmHoldcoMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= rpm_FormulasMember
 
RPM Holdco | Customer Relationships      
Reorganization [Line Items]      
Business acquisition, preliminary fair value of intangible assets   121,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= rpm_RpmHoldcoMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
 
RPM Holdco | Definite-Lived Trade Names      
Reorganization [Line Items]      
Business acquisition, preliminary fair value of intangible assets   2,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= rpm_RpmHoldcoMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
 
Other Long-Term Liabilities      
Reorganization [Line Items]      
Bankruptcy Note, net present value   325,100,000rpm_NetPresentValueOfPromissoryNotesPayable
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
 
Second Anniversary      
Reorganization [Line Items]      
Amount funded for trust as per agreement   102,500,000us-gaap_BankruptcyClaimsAmountOfClaimsUnderReviewByManagement
/ us-gaap_StatementScenarioAxis
= rpm_SecondAnniversaryMember
 
Third Anniversary      
Reorganization [Line Items]      
Amount funded for trust as per agreement   120,000,000us-gaap_BankruptcyClaimsAmountOfClaimsUnderReviewByManagement
/ us-gaap_StatementScenarioAxis
= rpm_ThirdAnniversaryMember
 
Fourth Anniversary      
Reorganization [Line Items]      
Amount funded for trust as per agreement   125,000,000us-gaap_BankruptcyClaimsAmountOfClaimsUnderReviewByManagement
/ us-gaap_StatementScenarioAxis
= rpm_ForthAnniversaryMember
 
Specialty Products Holding Corp. (SPHC) | RPM Holdco      
Reorganization [Line Items]      
Business acquisition, allocation of total consideration   $ 564,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= rpm_RpmHoldcoMember
/ dei_LegalEntityAxis
= rpm_SpecialtyProductsHoldingCorpMember