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Borrowings - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended |  |  |  |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 0 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |
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Dec. 03, 2013 | Jun. 29, 2012 | May 31, 2014 | May 31, 2013 | May 31, 2012 | Dec. 03, 2013 | Jun. 29, 2012 | May 09, 2014 Special Purpose Entity | Oct. 23, 2012 Revolving Credit Facility | Dec. 09, 2013 Unsecured 6.25% senior notes due December 15, 2013 | May 31, 2014 Unsecured 6.25% senior notes due December 15, 2013 | May 31, 2013 Unsecured 6.25% senior notes due December 15, 2013 | Oct. 23, 2012 Unsecured 3.45% senior notes due November 15, 2022 | May 31, 2014 Unsecured 3.45% senior notes due November 15, 2022 | May 31, 2013 Unsecured 3.45% senior notes due November 15, 2022 | Oct. 23, 2012 Unsecured 3.45% senior notes due November 15, 2022 | Jun. 29, 2012 Issuance of Debt Maximum | Jun. 29, 2012 Issuance of Debt Minimum | May 31, 2014 Revolving Credit Facilities | May 31, 2013 Revolving Credit Facilities | May 31, 2011 Accounts Receivable Securitization Facility | May 09, 2014 Accounts Receivable Securitization Facility | May 09, 2014 Accounts Receivable Securitization Facility New Facility | May 09, 2014 Accounts Receivable Securitization Facility New Facility | May 31, 2011 Accounts Receivable Securitization Facility Maximum | May 09, 2014 Accounts Receivable Securitization Facility Maximum New Facility | May 31, 2011 Accounts Receivable Securitization Facility Minimum | May 09, 2014 Accounts Receivable Securitization Facility Minimum New Facility | May 31, 2014 Unsecured 6.70% senior notes due November 1, 2015 | May 31, 2013 Unsecured 6.70% senior notes due November 1, 2015 | Jun. 29, 2012 Swingline Loans [Member] | Dec. 09, 2013 Investment in Kemrock convertible debt | May 31, 2014 Investment in Kemrock convertible debt | Dec. 09, 2013 Investment in Kemrock convertible debt
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2015 |  |  | $ 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2016 |  |  | 151,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2017 |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2018 |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2019 |  |  | 250,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt thereafter |  |  | 943,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused lines of credit |  |  | 797,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquidity available |  |  | 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated indebtedness |  |  | 49.40% | 53.40% |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 205,000,000
Debt, interest rate |  |  |  |  |  |  |  |  |  |  |  | 6.25% |  | 3.45% | 3.45% | 3.45% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.70% | [1] | 6.70% | [1] |  |  |  | 2.25%
Notes maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2020 |  |
Note Interest payment frequency, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Interest on the Convertible Notes semi-annually on June 15th and December 15th of each year, and began doing so on June 15, 2014. |  |
Proceeds from note issuance, net |  |  | 208,582,000 | 300,902,000 | 27,894,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,100,000 |  |
Principal amount of unsecured senior notes, repayments |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, due date |  |  |  |  |  |  |  |  |  | Dec. 15, 2013 | Dec. 15, 2013 | Dec. 15, 2013 |  | Nov. 15, 2022 | Nov. 15, 2022 |  |  |  | Jun. 29, 2017 | [2] | Jun. 29, 2017 | [2] |  |  |  |  |  |  |  |  | Nov. 01, 2015 | [1] | Nov. 01, 2015 | [1] |  |  |  |
Unsecured senior notes , interest rate |  |  |  |  |  |  |  |  |  | 6.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, conversion rate | 18.8905 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, initial conversion price per share |  |  |  |  |  | $ 52.94 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price, conversion premium percentage | 37.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Last reported sale price of RPM common stock |  |  |  |  |  | $ 38.64 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.92% |
Contractual interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000 |
Amortization of debt discount premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |
Debt discount remaining amortized period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years 6 months |
Unamortized debt discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,500,000 |
Carrying amount of the equity component of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,700,000 |
Debt |  |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity year |  |  |  |  |  |  |  |  |  |  |  |  | 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the offering of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 297,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing maximum capacity |  |  |  |  |  |  | 600,000,000 |  | 600,000,000 |  |  |  |  |  |  |  |  |  | 600,000,000 |  | 600,000,000 |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  | 50,000,000 |  |  |
Credit facility expiration date |  |  | Jun. 29, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility maturity period |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing potential maximum capacity |  |  |  |  |  |  | 800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350.00% | 785.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin rate over LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.25% |  | 1.00% |  |  |  |  |  |  |  |  |
Debt rating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | This margin would have increased to 1.25% if we had not maintained our public debt rating of at least BB+/Ba1/BB+ from any two of Standard & Poor's, Moody's or Fitch. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum required consolidated interest coverage ratio for EBITDA to interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly unused commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% |  | 0.30% |  |  |  |  |  |  |  |
Effective euro fixed-rate borrowing |  |  | 5.31% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.31% |  |  |  |  |  |  |
[1] | We entered into a cross-currency swap, which fixed the interest and principal payments in euros, resulting in an effective fixed-rate borrowing of 5.31%.
[2] | Interest was tied to AUD LIBOR at May 31, 2014, and averaged 3.96% for AUD denominated debt. Interest was tied to AUD LIBOR at May 31, 2013, and averaged 4.16% for AUD denominated debt.

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