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Description of Long Term Debt (Detail) (USD $) In Thousands, unless otherwise specified | May 31, 2014 | May 31, 2013
--- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Debt | $ 1,351,627 |  | $ 1,373,697 |
Less: current portion | 5,662 |  | 4,521 |
Total Long-Term Debt, Less Current Maturities | 1,345,965 |  | 1,369,176 |
Unsecured 6.25% senior notes due December 15, 2013 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt |  |  | 200,000 |
Unsecured 6.70% senior notes due November 1, 2015 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 150,000 | [1] | 150,000 | [1]
Unsecured 6.50% senior notes due February 14, 2018 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 248,627 | [2] | 248,259 | [2]
Unsecured 6.125% senior note due October 15, 2019 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 458,163 | [3] | 459,457 | [3]
Unsecured 2.25% senior convertible notes due December 15, 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 185,474 |  |  |
Unsecured 3.45% senior notes due November 15, 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 300,000 |  | 300,000 |
Revolving Credit Facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt | 2,090 | [4] | 7,701 | [4]
Other Borrowings |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Other obligations, including capital leases and unsecured notes payable at various rates of interest due in installments through 2017. | $ 7,273 |  | $ 8,280 |
[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 Sum of the carrying values as of the balance sheet date of all long-term and short-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, including the portions thereof scheduled to be repaid within one year or the normal operating cycle, if longer plus capital lease obligations. + References No definition available. + Details
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- Definition Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section H + Details
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- Definition Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer. + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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