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Description of Long Term Debt (Parenthetical) (Detail) $ in Thousands |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 23, 2012 USD ($) | May. 31, 2015 USD ($) Bank | May. 31, 2014 USD ($) Bank | May. 26, 2015 USD ($) | May. 27, 2011 USD ($) | Oct. 09, 2009 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Effective euro fixed-rate borrowing |  |  | 5.31% |  |  |  |  |
Debt instrument, redemption date |  |  | May 29, 2015 |  |  |  |  |
Debt |  |  | $ 205,000 |  | $ 205,000 |  |  |
Unsecured 0% senior notes due November 1, 2015 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, interest rate | [1] |  |  |  | 6.70% |  |  |
Debt, due date | [1] |  | Nov. 01, 2015 |  | Nov. 01, 2015 |  |  |
Effective euro fixed-rate borrowing |  |  | 5.31% |  |  |  |  |
Debt instrument, redemption date |  |  | May 29, 2015 |  |  |  |  |
Unsecured 0% senior notes due February 14, 2018 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, interest rate | [2] |  | 6.50% |  | 6.50% |  |  |
Debt, due date | [2] |  | Feb. 14, 2018 |  | Feb. 14, 2018 |  |  |
Debt |  |  | $ 250,000 |  |  |  |  |
Amortization of debt discount premium |  |  | $ 1,000 |  | $ 1,400 |  |  |
Debt instrument, effective interest rate |  |  | 6.704% |  | 6.704% |  |  |
Unsecured 0% senior note due October 15, 2019 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | $ 150,000 | $ 300,000
Debt, interest rate | [3] |  | 6.125% |  | 6.125% |  |  |
Debt, due date | [3] |  | Oct. 15, 2019 |  | Oct. 15, 2019 |  |  |
Amortization of debt discount premium |  |  | $ 100 |  | $ 200 |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  | 4.934% | 6.139%
Unamortization of debt premium |  |  | $ 6,900 |  | $ 8,300 |  |  |
Unsecured 0% senior convertible notes due December 15, 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, interest rate |  |  | 2.25% |  | 2.25% |  |  |
Debt, due date |  |  | Dec. 15, 2020 |  | Dec. 15, 2020 |  |  |
Unsecured 0% senior notes due November 15, 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  | $ 300,000 |  |  |  |  |  |
Debt, interest rate |  | 3.45% | 3.45% |  | 3.45% |  |  |
Debt, due date |  |  | Nov. 15, 2022 |  | Nov. 15, 2022 |  |  |
Debt, maturity year |  | 2022 |  |  |  |  |  |
Revolving Credit Facilities |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, due date | [4] |  | Dec. 05, 2019 |  | Dec. 05, 2019 |  |  |
Other Borrowings |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, maturity year |  |  | 2017 |  | 2017 |  |  |
Unsecured 0% notes due June 1, 2045 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt, interest rate |  |  | 5.25% | [5] |  | 5.25% |  |
Debt, due date | [5] |  | Jun. 01, 2045 |  | Jun. 01, 2045 |  |  |
Debt |  |  | $ 250,000 |  |  | $ 250,000 |  |
Amortization of debt discount premium |  |  | $ 1,500 |  |  |  |  |
Debt instrument, effective interest rate |  |  | 5.29% |  |  |  |  |
Accounts Receivable Securitization Program |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of banks involved in securitization process | Bank |  |  | 2 |  | 2 |  |  |
Debt, due date |  |  | May 09, 2017 |  | May 09, 2017 |  |  |
Australian Dollar Denominated Debt | Revolving Credit Facilities |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense |  |  | $ 10,316,000 |  |  |  |  |
Australian Dollar Denominated Debt | Revolving Credit Facilities | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Average interest rate |  |  | 3.095% |  | 3.96% |  |  |
Euro Denominated Debt | Revolving Credit Facilities |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense |  |  | $ 16,490,000 |  |  |  |  |
Euro Denominated Debt | Revolving Credit Facilities | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Average interest rate |  |  | 1.075% |  |  |  |  |
Euro LIBOR Denominated Debt | Revolving Credit Facilities |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense |  |  | $ 70,000,000 |  |  |  |  |
Euro LIBOR Denominated Debt | Revolving Credit Facilities | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Average interest rate |  |  | 1.265% |  |  |  |  |
Swingline Loans | Revolving Credit Facilities |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest expense |  |  | $ 14,237,000 |  |  |  |  |
Swingline Loans | Revolving Credit Facilities | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Average interest rate |  |  | 1.259% |  |  |  |  |
[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%. Pursuant to the Redemption Notice issued to the holders thereof by the Company on April 28, 2015, the 6.70% Senior Notes issued by RPM United Kingdom G.P., which were due to mature on November 1, 2015, were redeemed on May 29, 2015.
[2] | The $250.0 million aggregate principal amount of the notes due 2018 is adjusted for the amortization of the original issue discount, which approximated $1.0 million and $1.4 million at May 31, 2015 and 2014, respectively. 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 6.704% for both years presented.
[3] | Includes the combination of the October 2009 initial issuance of $300.0 million aggregate principal amount and the May 2011 issuance of an additional $150.0 million aggregate principal amount of these notes. The $300.0 million aggregate principal amount of the notes due 2019 from the initial issuance is adjusted for the amortization of the original issue discount, which approximated $0.1 million and $0.2 million at May 31, 2015 and 2014. The original issue discount effectively reduced the ultimate proceeds from the October 2009 financing. The effective interest rate on the notes issued in October 2009, including the amortization of the discount, is 6.139%. The additional $150.0 million aggregate principal amount of the notes due 2019 issued in May 2011 is adjusted for the unamortized premium received at issuance, which approximated $6.9 million and $8.3 million at May 31, 2015 and 2014, respectively. The premium effectively increased the proceeds from the financing. The effective interest rate on the $150.0 million notes issued in May 2011 is 4.934%.
[4] | 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.
[5] | 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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