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Financing Arrangements (Tables) | 6 Months Ended
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Nov. 30, 2011
Financing Arrangements |
Summary of recourse and non-recourse debt |
|  | November 30, |  | May 31, |
|  | 2011 |  | 2011 |
Recourse debt: |  |  |  |  |
Revolving credit facility expiring April 12, 2016 with interest payable monthly (see Note 8) |  | $ | 150,000 |  | $ | 100,000 |
Revolving credit facility (secured by aircraft and related engines and components) due May 1, 2015 with floating interest rate, payable monthly |  | 63,296 |  | 54,940 |
Note payable due July 19, 2012 with interest at 7.22%, payable monthly |  | 9,421 |  | 2,217 |
Mortgage loan (secured by Wood Dale, Illinois facility) due August 1, 2015 with interest at 5.01% |  | 11,000 |  | 11,000 |
Convertible notes payable due March 1, 2014 with interest at 1.625% payable semi-annually on March 1 and September 1 |  | 75,237 |  | 73,418 |
Convertible notes payable due March 1, 2016 with interest at 2.25% payable semi-annually on March 1 and September 1 |  | 52,485 |  | 51,309 |
Convertible notes payable due February 1, 2026 with interest at 1.75% payable semi-annually on February 1 and August 1 |  | 110,927 |  | 107,420 |
Industrial revenue bond (secured by trust indenture on property, plant and equipment) due August 1, 2018 with floating interest rate, payable monthly |  | 25,000 |  | 25,000 |
Total recourse debt |  | 497,366 |  | 425,304 |
Current maturities of recourse debt |  | (70,586 | ) | (111,323 | )
Long-term recourse debt |  | $ | 426,780 |  | $ | 313,981 |
Non-recourse debt: |  |  |  |  |
Non-recourse note payable due December 8, 2011 with interest at 13.0% |  | $ | 6,545 |  | $ | — |
Non-recourse note payable due July 19, 2012 with interest at 7.22% |  | — |  | 8,201 |
Non-recourse note payable due April 3, 2015 with interest at 8.38% |  | — |  | 3,654 |
Total non-recourse debt |  | 6,545 |  | 11,855 |
Current maturities of non-recourse debt |  | (6,545 | ) | (823 | )
Long-term non-recourse debt |  | $ | — |  | $ | 11,032 |
Schedule of the long-term debt and equity component (recorded in capital surplus, net of income tax benefit) of convertible notes |
| November 30, |  | May 31, |
|  | 2011 |  | 2011 |
Long-term debt: |  |  |  |  |
Principal amount |  | $ | 268,380 |  | $ | 268,380 |
Unamortized discount |  | (29,731 | ) | (36,233 | )
Net carrying amount |  | $ | 238,649 |  | $ | 232,147 |
Equity component, net of tax |  | $ | 74,966 |  | $ | 74,966 |
Schedule of interest expense associated with the convertible notes |
|  | Three Months Ended |  | Six Months Ended |
|  | November 30, |  | November 30, |
|  | 2011 |  | 2010 |  | 2011 |  | 2010 |
Coupon interest |  | $ | 1,228 |  | $ | 1,228 |  | $ | 2,456 |  | $ | 2,475 |
Amortization of deferred financing fees |  | 188 |  | 188 |  | 376 |  | 377 |
Amortization of discount |  | 3,282 |  | 3,040 |  | 6,502 |  | 6,051 |
Interest expense related to convertible notes |  | $ | 4,698 |  | $ | 4,456 |  | $ | 9,334 |  | $ | 8,903 |

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