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Borrowings - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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May. 26, 2015 USD ($) | May. 09, 2014 USD ($) | Dec. 09, 2013 USD ($) | Dec. 03, 2013 $ / shares | Oct. 23, 2012 USD ($) | Apr. 30, 2015 $ / shares | May. 31, 2015 USD ($) Agency $ / shares | Feb. 28, 2015 $ / shares | [1] | Nov. 30, 2014 $ / shares | Aug. 31, 2014 $ / shares | May. 31, 2014 USD ($) $ / shares | Feb. 28, 2014 $ / shares | [1] | Nov. 30, 2013 $ / shares | Aug. 31, 2013 $ / shares | May. 31, 2015 USD ($) Agency $ / shares | May. 31, 2014 USD ($) $ / shares | May. 31, 2013 USD ($) $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2016 |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |
Maturities of long-term debt in 2017 |  |  |  |  |  |  |  | 100,400,000 |  |  |  |  |  |  |  |  | 100,400,000 |  |  |
Maturities of long-term debt in 2018 |  |  |  |  |  |  |  | 249,100,000 |  |  |  |  |  |  |  |  | 249,100,000 |  |  |
Maturities of long-term debt in 2019 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 0 |  |  |
Maturities of long-term debt in 2020 |  |  |  |  |  |  |  | 567,900,000 |  |  |  |  |  |  |  |  | 567,900,000 |  |  |
Maturities of long-term debt thereafter |  |  |  |  |  |  |  | 736,700,000 |  |  |  |  |  |  |  |  | 736,700,000 |  |  |
Credit facility, available liquidity |  |  |  |  |  |  |  | 789,000,000 |  |  |  |  |  |  |  |  | 789,000,000 |  |  |
Liquidity available |  |  |  |  |  |  |  | $ 963,800,000 |  |  |  |  |  |  |  |  | $ 963,800,000 |  |  |
Consolidated indebtedness |  |  |  |  |  |  |  | 56.20% |  |  |  |  | 49.40% |  |  |  | 56.20% |  | 49.40% |
Credit facility borrowing maximum capacity |  |  |  |  |  |  |  | $ 800,000,000 |  |  |  |  |  |  |  |  | $ 800,000,000 |  |  |
Credit facility borrowing potential maximum capacity |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  | $ 1,000,000,000 |  |  |
Interest coverage ratio |  |  |  |  |  |  |  | 350.00% |  |  |  |  |  |  |  |  | 350.00% |  |  |
Number of credit rating agencies | Agency |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  | 2 |  |  |
Issuance of note |  |  |  |  |  |  |  | $ 205,000,000 |  |  |  |  | $ 205,000,000 |  |  |  | $ 205,000,000 |  | $ 205,000,000 |
Proceeds from note issuance, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 460,560,000 |  | $ 208,532,000 | $ 300,902,000
Debt instrument, conversion rate |  |  |  |  | 18.8905 |  |  |  |  |  |  |  |  |  |  |  | 18.9162 |  |  |
Convertible notes, initial conversion price per share | $ / shares |  |  |  |  | $ 52.94 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial conversion price, conversion premium percentage |  |  |  |  | 37.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Last reported sale price of RPM common stock | $ / shares |  |  |  |  | $ 38.64 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Per Share | $ / shares |  |  |  |  |  |  |  | $ 0.260 |  | $ 0.260 | $ 0.260 | $ 0.240 | $ 0.240 | $ 0.240 | $ 0.240 | $ 0.225 | $ 1.020 |  | $ 0.945 | $ 0.890
Special Purpose Entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, available liquidity |  |  |  |  |  |  |  | $ 689,000,000 |  |  |  |  |  |  |  |  | $ 689,000,000 |  |  |
Credit facility borrowing maximum capacity |  |  |  |  |  |  |  | 800,000,000 |  |  |  |  |  |  |  |  | $ 800,000,000 |  |  |
Credit facility expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 05, 2019 |  |  |
Previous Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing maximum capacity |  |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  | $ 600,000,000 |  |  |
Credit facility expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 29, 2017 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing maximum capacity |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility, repayments |  | $ 245,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Debt | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated indebtedness |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  | 65.00% |  |  |
Issuance of Debt | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  | 350.00% |  |  |  |  |  |  |  |  | 350.00% |  |  |
Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  | 9.09% |  |  |  |  |  |  |  |  | 9.09% |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54.80% |  |  |
Unsecured senior notes , maturity date | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 05, 2019 |  | Dec. 05, 2019 |
Accounts Receivable Securitization Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing maximum capacity |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |
Accounts Receivable Securitization Facility | New Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity period |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable Securitization Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly unused commitment fee |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable Securitization Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly unused commitment fee |  |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured 6.25% senior notes due December 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of unsecured senior notes, repayments |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes , maturity date |  |  |  | Dec. 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes , interest rate |  |  |  | 6.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured 0% senior notes due November 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate |  |  |  |  |  | 3.45% |  | 3.45% |  |  |  |  | 3.45% |  |  |  | 3.45% |  | 3.45% |
Unsecured senior notes , maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 15, 2022 |  | Nov. 15, 2022 |
Debt |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity year |  |  |  |  |  | 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from the offering of notes |  |  |  |  |  | $ 297,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured 0% notes due June 1, 2045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  | $ 250,000,000 |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |
Debt, interest rate |  | 5.25% |  |  |  |  |  | 5.25% | [3] |  |  |  |  |  |  |  | 5.25% | [3] |  |
Note Interest payment frequency, term |  | We will pay interest on the New Notes semi-annually on June 1st and December 1st of each year, and will begin doing so on December 1, 2015. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from note issuance, net |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes , maturity date | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2045 |  | Jun. 01, 2045 |
Debt instrument, effective interest rate |  |  |  |  |  |  |  | 5.29% |  |  |  |  |  |  |  |  | 5.29% |  |  |
Amortization of debt discount premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |
Senior notes, yield to maturity |  | 99.401% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  |  |  | $ 205,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate |  |  |  | 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 |  |  |  | $ 200,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Per Share | $ / shares |  |  |  |  |  |  | $ 0.24 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  | 3.92% |  |  |  |  |  |  |  |  | 3.92% |  |  |
Contractual interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,600,000 |  | $ 2,200,000 |
Amortization of debt discount premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,700,000 |  | $ 1,200,000 |
Debt discount remaining amortized period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years 6 months |  |  |
Unamortized debt discount |  |  |  |  |  |  |  | $ 16,800,000 |  |  |  |  |  |  |  |  | $ 16,800,000 |  |  |
Carrying amount of the equity component of debt |  |  |  |  |  |  |  | $ 20,700,000 |  |  |  |  |  |  |  |  | $ 20,700,000 |  |  |
[1] | Reflects adjustments for approximately $106.2 million to the Provision for Income Taxes related to the recognition of an ASC 740-30 tax liability for the potential repatriation of foreign earnings and related impact on Net Income Attributable to Noncontrolling Interests.
[2] | Interest was tied to AUD LIBOR at May 31, 2015, and averaged 3.095% for AUD denominated debt ($10,316), 1.075% on EUR denominated debt ($16,490), 1.265% on Euro LIBOR denominated debt ($70,000) and 1.259% on our swing-line ($14,237). Interest was tied to AUD LIBOR at May 31, 2014, and averaged 3.96% for AUD denominated debt.
[3] | The $250.0 million face amount of the notes due 2045 is adjusted for the amortization of the original issue discount, which approximated $1.5 million at May 31, 2015. The original issue discount effectively reduced the ultimate proceeds from the financing. The effective interest rate on the notes, including the amortization of the discount, is 5.29%.

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- Definition Interest Coverage ratio + References No definition available. + Details
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- Definition Dividend or interest rate associated with the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. Noncash are transactions that affect recognized assets or liabilities but that do not result in cash receipts or cash payments. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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