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Borrowings - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2017 USD ($) Trust | May 25, 2017 USD ($) | May 09, 2017 USD ($) | Dec. 09, 2013 USD ($) | Dec. 03, 2013 $ / shares | Apr. 30, 2017 $ / shares | May 31, 2017 USD ($) Trust $ / shares | Feb. 28, 2017 $ / shares | Nov. 30, 2016 $ / shares | [1] | Aug. 31, 2016 $ / shares | May 31, 2016 USD ($) $ / shares | Feb. 29, 2016 $ / shares | Nov. 30, 2015 $ / shares | Aug. 31, 2015 $ / shares | May 31, 2017 USD ($) Trust $ / shares | May 31, 2016 USD ($) $ / shares | May 31, 2015 USD ($) $ / shares | Dec. 23, 2018 USD ($) | Dec. 23, 2017 USD ($) | Mar. 31, 2017 | Mar. 02, 2017 USD ($) | Dec. 23, 2016 USD ($) | May 29, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2018 |  | $ 253,600,000 |  |  |  |  |  |  | $ 253,600,000 |  |  |  |  |  |  |  |  |  | $ 253,600,000 |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2019 |  | 0 |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2020 |  | 650,800,000 |  |  |  |  |  |  | 650,800,000 |  |  |  |  |  |  |  |  |  | 650,800,000 |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2021 |  | 193,300,000 |  |  |  |  |  |  | 193,300,000 |  |  |  |  |  |  |  |  |  | 193,300,000 |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt in 2022 |  | 0 |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Maturities of long-term debt thereafter |  | 992,400,000 |  |  |  |  |  |  | 992,400,000 |  |  |  |  |  |  |  |  |  | 992,400,000 |  |  |  |  |  |  |  |  |  |
Credit facility, available liquidity |  | 799,100,000 |  |  |  |  |  |  | 799,100,000 |  |  |  |  |  |  |  |  |  | 799,100,000 |  |  |  |  |  |  |  |  |  |
Liquidity available |  | $ 1,150,000,000 |  |  |  |  |  |  | $ 1,150,000,000 |  |  |  |  |  |  |  |  |  | $ 1,150,000,000 |  |  |  |  |  |  |  |  |  |
Consolidated indebtedness |  | 59.30% |  |  |  |  |  |  | 59.30% |  |  |  |  | 54.40% |  |  |  |  | 59.30% |  | 54.40% |  |  |  |  |  |  |  |
Issuance of note |  | $ 205,000,000 |  |  |  |  |  |  | $ 205,000,000 |  |  |  |  | $ 205,000,000 |  |  |  |  | $ 205,000,000 |  | $ 205,000,000 |  |  |  |  |  |  |  |
Credit facility borrowing potential maximum capacity |  | 1,000,000,000 |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Initial payment for long term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 450,000,000 |  |  |  |  |  |  |  |  |  |
Amount funded for trust as per agreement |  | $ 450,000,000 |  | $ 119,100,000 |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  | $ 102,500,000 |
Number of remaining trust payments due | Trust |  | 1 |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Bankruptcy prepayment discount rate |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance |  | $ 0 |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Debt instrument, conversion rate |  |  |  |  |  |  | 18.8905 |  |  |  |  |  |  |  |  |  |  |  | 19.049431 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 0.300 |  | $ 0.300 | $ 0.300 | $ 0.275 | $ 0.275 |  | $ 0.275 | $ 0.275 | $ 0.260 | $ 1.175 |  | $ 1.085 |  | $ 1.020 |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note Interest payment frequency, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Interest on the Convertible Notes semi-annually on June 15th and December 15th of each year |  |  |  |  |  |  |  |  |  |
Notes maturity date |  |  |  |  |  | 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Per Share | $ / shares |  |  |  |  |  |  |  | $ 0.24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 3.92% |  |  |  |  |  |  | 3.92% |  |  |  |  |  |  |  |  |  | 3.92% |  |  |  |  |  |  |  |  |  |
Contractual interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,600,000 |  | $ 4,600,000 |  |  |  |  |  |  |  |
Amortization of debt discount premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,900,000 |  | 2,800,000 |  |  |  |  |  |  |  |
Debt discount remaining amortized period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years 6 months |  |  |  |  |  |  |  |  |  |
Unamortized debt discount |  | $ 11,200,000 |  |  |  |  |  |  | $ 11,200,000 |  |  |  |  |  |  |  |  |  | $ 11,200,000 |  |  |  |  |  |  |  |  |  |
Carrying amount of the equity component of debt |  | $ 20,700,000 |  |  |  |  |  |  | 20,700,000 |  |  |  |  |  |  |  |  |  | 20,700,000 |  |  |  |  |  |  |  |  |  |
Margin |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  | 0.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount funded for trust as per agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 | $ 120,000,000 |  |  |  |
Other Long-Term Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bankruptcy Note, net present value |  | $ 120,400,000 |  |  |  |  |  |  | 120,400,000 |  |  |  |  |  |  |  |  |  | 120,400,000 |  |  |  |  |  |  |  |  |  |
New Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, available liquidity |  | $ 599,100,000 |  |  |  |  |  |  | $ 599,100,000 |  |  |  |  |  |  |  |  |  | $ 599,100,000 |  |  |  |  |  |  |  |  |  |
Credit facility borrowing maximum capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  |  |  |  |  |
Credit facility expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 05, 2019 |  |  |  |  |  |
Interest coverage ratio |  | 920.00% |  |  |  |  |  |  | 920.00% |  |  |  |  |  |  |  |  |  | 920.00% |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58.10% |  |  |  |  |  |  |  |  |  |
Previous Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing maximum capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |
Unsecured 5.25% notes due June 1, 2045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  | $ 250,000,000 |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  | $ 250,000,000 |  |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |  | $ 50,000,000 |  | $ 250,000,000
Debt, interest rate |  | 5.25% | [2] |  |  |  |  |  | 5.25% | [2] |  |  |  | 5.25% | [2] |  |  |  | 5.25% | [2] | 5.25% | [2] |  |  |  |  | 5.25% |  | 5.25%
Note Interest payment frequency, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Interest on the 2045 Notes accrues from December 1, 2016 and is payable semiannually in arrears on June 1st and December 1st of each year, beginning June 1, 2017, at a rate of 5.250% per year |  |  |  |  |  |  |  |  |  |
Unsecured senior notes , maturity date | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2045 |  | Jun. 01, 2045 |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 5.29% |  |  |  |  |  |  | 5.29% |  |  |  |  |  |  |  |  |  | 5.29% |  |  |  |  |  |  | 4.839% |  |  |
Amortization of debt discount premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  | $ 1,500,000 |  |  |  |  |  |  |  |
Unsecured 3.75% notes due March 15, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  | $ 400,000,000 |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  | $ 400,000,000 |  |
Debt, interest rate |  | 3.75% |  |  |  |  |  |  | 3.75% |  |  |  |  | 3.75% |  |  |  |  | 3.75% |  | 3.75% |  |  |  |  |  | 3.75% |  |
Note Interest payment frequency, term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Interest on the 2027 Notes accrues from March 2, 2017 and is payable semiannually in arrears on March 15th and September 15th of each year, beginning September 15, 2017, at a rate of 3.750% per year |  |  |  |  |  |  |  |  |  |
Unsecured senior notes , maturity date | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 15, 2027 |  | Mar. 15, 2027 |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 3.75% |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |
Issuance of Debt | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated indebtedness |  | 65.00% |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |  |
Issuance of Debt | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio |  | 350.00% |  |  |  |  |  |  | 350.00% |  |  |  |  |  |  |  |  |  | 350.00% |  |  |  |  |  |  |  |  |  |
New Accounts Receivable Securitization Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity period |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable Securitization Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing maximum capacity |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable Securitization Facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly unused commitment fee |  | 0.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable Securitization Facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly unused commitment fee |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured 2.25% senior convertible notes due December 15, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, interest rate |  | 2.25% |  |  |  |  |  |  | 2.25% |  |  |  |  | 2.25% |  |  |  |  | 2.25% |  | 2.25% |  |  |  |  |  |  |  |
Unsecured senior notes , maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 15, 2020 |  | Dec. 15, 2020 |  |  |  |  |  |  |  |
Unsecured 2.25% senior convertible notes due December 15, 2020 | Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of note |  |  |  |  |  | $ 205,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Reflects the pretax goodwill and intangible asset impairment losses of $188.3 million related to our Kirker reporting unit. Refer to Note B, “Goodwill and Other Intangible Assets,” for further information. Also reflects $12.3 million pretax charge relating to the Flowcrete decision to exit the Middle East.
[2] | 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, 2017 and 2016. 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%. In March 2017, as a further issuance of the 5.25% notes due 2045, we closed an offering of $50.0 million aggregate principal, which is adjusted for the unamortized premium received at issuance, which approximated $3.1 million at May 31, 2017. The premium effectively increased the proceeds from the financing. The effective interest rate on the $50.0 million notes issued March 2017 is 4.839%. At May 31, 2017 and 2016, the notes are adjusted for debt issuance costs, net of amortization, for approximately $3.2 million and $2.6 million, respectively.
[3] | The $400.0 million face amount of the notes due 2027 is adjusted for the amortization of the original issue discount and debt issuance cost, net of amortization, which approximated $0.5 million and $3.8 million, respectively, at May 31, 2017. 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 3.750%.

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- Definition Available Liquidity + References No definition available. + Details
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- Definition Bankruptcy prepayment discount rate. + References No definition available. + Details
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- Definition Credit agreement leverage ratio. + References No definition available. + Details
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- Definition Debt instrument unused borrowing capacity fee percentage. + References No definition available. + Details
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- Definition Interest coverage ratio. + References No definition available. + Details
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- Definition Interest payment frequency. + References No definition available. + Details
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- Definition Line of Credit Facility, Potential Maximum Borrowing Capacity + References No definition available. + Details
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- Definition Net present value of promissory notes payable. + References No definition available. + Details
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