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Specialty Products Holding Corp. ("SPHC") - Additional Information (Detail) (USD $)
3 Months Ended
May 31, 2010
Nov. 30, 2014
May 31, 2012
Bond
Feb. 28, 2015
Reorganization [Line Items]        
Number of appeal bonds satisfied     1rpm_NumberOfAppealBondsSatisfied  
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    
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
   
Scenario, Forecast        
Reorganization [Line Items]        
Unremitted Foreign Earnings       347,500,000us-gaap_UndistributedEarningsOfForeignSubsidiaries
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Scenario, Forecast | Minimum        
Reorganization [Line Items]        
Deferred income tax liability associated with future repatriations       100,000,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Scenario, Forecast | Maximum        
Reorganization [Line Items]        
Deferred income tax liability associated with future repatriations       $ 110,000,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember