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Financing Arrangements (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |  |  |  | 6 Months Ended |  | 6 Months Ended |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  |  |  |  |  | 3 Months Ended |
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Nov. 30, 2011 | Nov. 30, 2010 | May 31, 2011 | Nov. 30, 2011 Recourse Debt | Nov. 30, 2011 Revolving credit facility expiring April 12, 2016 with interest payable monthly (see Note 7) | Oct. 13, 2011 Revolving credit facility expiring April 12, 2016 with interest payable monthly (see Note 7) | May 31, 2011 Revolving credit facility expiring April 12, 2016 with interest payable monthly (see Note 7) | Nov. 30, 2011 Revolving credit facility expiring April 12, 2016 with interest payable monthly (see Note 7) Eurodollar rate | Nov. 30, 2011 Revolving credit facility expiring April 12, 2016 with interest payable monthly (see Note 7) Eurodollar rate Minimum | Nov. 30, 2011 Revolving credit facility expiring April 12, 2016 with interest payable monthly (see Note 7) Eurodollar rate Maximum | Nov. 30, 2011 Revolving credit facility expiring April 12, 2016 with interest payable monthly (see Note 7) Base rate | Nov. 30, 2011 Revolving credit facility expiring April 12, 2016 with interest payable monthly (see Note 7) Base rate Minimum | Nov. 30, 2011 Revolving credit facility expiring April 12, 2016 with interest payable monthly (see Note 7) Base rate Maximum | Nov. 30, 2011 Note payable due July 19, 2012 with interest at 7.22%, payable monthly | May 31, 2011 Note payable due July 19, 2012 with interest at 7.22%, payable monthly | Nov. 30, 2011 Revolving credit facility (secured by aircraft and related engines and components) due May 1, 2015 with floating interest rate, payable monthly | May 31, 2011 Revolving credit facility (secured by aircraft and related engines and components) due May 1, 2015 with floating interest rate, payable monthly | Nov. 30, 2011 Mortgage loan (secured by Wood Dale, Illinois facility) due August 1, 2015 with interest at 5.01% | May 31, 2011 Mortgage loan (secured by Wood Dale, Illinois facility) due August 1, 2015 with interest at 5.01% | Nov. 30, 2011 Convertible notes payable | Nov. 30, 2010 Convertible notes payable | Nov. 30, 2011 Convertible notes payable | Nov. 30, 2010 Convertible notes payable | May 31, 2011 Convertible notes payable | Nov. 30, 2011 Convertible notes payable due March 1, 2014 with interest at 1.625% payable semi-annually on March 1 and September 1 | May 31, 2011 Convertible notes payable due March 1, 2014 with interest at 1.625% payable semi-annually on March 1 and September 1 | Nov. 30, 2011 Convertible notes payable due March 1, 2016 with interest at 2.25% payable semi-annually on March 1 and September 1 | Nov. 30, 2010 Convertible notes payable due March 1, 2016 with interest at 2.25% payable semi-annually on March 1 and September 1 | May 31, 2011 Convertible notes payable due March 1, 2016 with interest at 2.25% payable semi-annually on March 1 and September 1 | Nov. 30, 2011 Convertible notes payable due February 1, 2026 with interest at 1.75% payable semi-annually on February 1 and August 1 | May 31, 2011 Convertible notes payable due February 1, 2026 with interest at 1.75% payable semi-annually on February 1 and August 1 | Nov. 30, 2011 Industrial revenue bond (secured by trust indenture on property, plant and equipment) due August 1, 2018 with floating interest rate, payable monthly | May 31, 2011 Industrial revenue bond (secured by trust indenture on property, plant and equipment) due August 1, 2018 with floating interest rate, payable monthly | Nov. 30, 2011 Non-recourse note payable due December 8, 2011 with interest at 13.0% | Nov. 30, 2011 Non-recourse note payable due July 19, 2012 with interest at 7.22% | May 31, 2011 Non-recourse note payable due July 19, 2012 with interest at 7.22% | Nov. 30, 2011 Non-recourse note payable due April 3, 2015 with interest at 8.38% | May 31, 2011 Non-recourse note payable due April 3, 2015 with interest at 8.38%
Financing Arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.22% |  |  |  | 5.01% |  |  |  |  |  |  | 1.625% |  | 2.25% |  |  | 1.75% |  |  |  | 13.00% | 7.22% |  | 8.38% |
Total recourse debt | $ 497,366 |  | $ 425,304 |  | $ 150,000 |  | $ 100,000 |  |  |  |  |  |  | $ 9,421 | $ 2,217 | $ 63,296 | $ 54,940 | $ 11,000 | $ 11,000 |  |  |  |  |  | $ 75,237 | $ 73,418 | $ 52,485 |  | $ 51,309 | $ 110,927 | $ 107,420 | $ 25,000 | $ 25,000 |  |  |  |  |
Current maturities of recourse debt | (70,586) |  | (111,323) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term recourse debt | 426,780 |  | 313,981 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total non-recourse debt | 6,545 |  | 11,855 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,545 |  | 8,201 |  | 3,654
Current maturities of non-recourse debt | (6,545) |  | (823) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term non-recourse debt |  |  | 11,032 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 580,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity under the credit agreement before amendment |  |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in the revolving commitment subject to the agreement |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity optional expansion |  |  |  |  |  | 680,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of variable rate basis |  |  |  |  |  |  |  | Eurodollar Rate |  |  | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  |  |  | 1.25% | 2.25% |  | 0.25% | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt associated with aircraft sold, assumed by acquirer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,252 |
Non-recourse debt assumed in connection with purchase of joint venture partner's interest in a narrow-body aircraft |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,545 |  |  |  |
Repurchased of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000 |  |  |  |  |  |  |  |  |  |
Repurchased of convertible notes in cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,667 |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  | 97 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 97 |  |  |  |  |  |  |  |  |  |
Face value of long-term recourse debt |  |  |  | 456,511 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 268,380 |  | 268,380 |  | 268,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of long-term recourse debt |  |  |  | 438,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | 456,511 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 268,380 |  | 268,380 |  | 268,380 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (29,731) |  | (29,731) |  | (36,233) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 238,649 |  | 238,649 |  | 232,147 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity component, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74,966 |  | 74,966 |  | 74,966 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.82% |  | 7.41% |  |  | 8.48% |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coupon interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,228 | 1,228 | 2,456 | 2,475 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 188 | 188 | 376 | 377 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of discount | 6,502 | 6,051 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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