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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
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.