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Description of Long Term Debt (Parenthetical) (Detail) (USD $) |  |  | 0 Months Ended | 12 Months Ended |  |  | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  |  |
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May 31, 2014 | Jun. 29, 2012 | 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 | May 31, 2014 Unsecured 6.70% senior notes due November 1, 2015 | May 31, 2013 Unsecured 6.70% senior notes due November 1, 2015 | May 31, 2014 Unsecured 6.50% senior notes due February 14, 2018 | May 31, 2013 Unsecured 6.50% senior notes due February 14, 2018 | May 31, 2014 Unsecured 6.125% senior note due October 15, 2019 | May 31, 2013 Unsecured 6.125% senior note due October 15, 2019 | May 27, 2011 Unsecured 6.125% senior note due October 15, 2019 | Oct. 09, 2009 Unsecured 6.125% senior note due October 15, 2019 | May 31, 2014 Unsecured 2.25% senior convertible notes due December 15, 2020 | May 31, 2013 Unsecured 2.25% senior convertible notes due December 15, 2020 | 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 | May 31, 2014 Revolving Credit Facilities | May 31, 2013 Revolving Credit Facilities | May 31, 2014 Other Borrowings | May 31, 2013 Other Borrowings | May 31, 2014 Unsecured 6.25% senior notes due December 15, 2013 | May 31, 2013 Unsecured 6.25% senior notes due December 15, 2013 | May 31, 2014 London Interbank Offered Rate (LIBOR) Revolving Credit Facilities | May 31, 2013 London Interbank Offered Rate (LIBOR) Revolving Credit Facilities
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  | $ 205,000,000 | $ 205,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility borrowing capacity |  | 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000,000 |  | 600,000,000 |  |  |  |  |  |  |
Debt, interest rate |  |  |  |  | 6.25% | 6.70% | [1] | 6.70% | [1] | 6.50% | [2] | 6.50% | [2] | 6.125% | [3] | 6.125% | [3] |  |  | 2.25% | 2.25% |  | 3.45% | 3.45% | 3.45% |  |  |  |  |  |  | 6.25% | 6.25% |  |
Debt, due date |  |  | Dec. 15, 2013 | Dec. 15, 2013 | Dec. 15, 2013 | Nov. 01, 2015 | [1] | Nov. 01, 2015 | [1] | Feb. 14, 2018 | [2] | Feb. 14, 2018 | [2] | Oct. 15, 2019 | [3] | Oct. 15, 2019 | [3] |  |  | Dec. 15, 2020 | Dec. 15, 2020 |  | Nov. 15, 2022 | Nov. 15, 2022 |  | Jun. 29, 2017 | [4] | Jun. 29, 2017 | [4] |  |  |  |  |  |
Debt, maturity year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2022 |  |  |  |  |  |  |  | 2017 | 2017 |  |  |  |
Effective euro fixed-rate borrowing | 5.31% |  |  |  |  | 5.31% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  |  |  |  |  |  | 6.704% |  | 6.704% |  |  |  |  |  | 4.934% | 6.139% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt discount premium |  |  |  |  |  |  |  |  |  | 1,400,000 |  | 1,700,000 |  | 200,000 |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 | 300,000,000 |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |
Unamortization of debt premium |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,300,000 |  | $ 9,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.96% | 4.16%
[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] | The $250.0 million aggregate principal amount of the notes due 2018 is adjusted for the amortization of the original issue discount, which approximated $1.4 million and $1.7 million at May 31, 2014 and 2013, 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 $0.2 million at May 31, 2014 and 2013. 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 $8.3 million and $9.7 million at May 31, 2014 and 2013, 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, 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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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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