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Financing Arrangements (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Aug. 31, 2012 | Aug. 31, 2011 | May 31, 2012
Financing Arrangements |  |  |
Total debt | $ 787,600,000 |  | $ 792,200,000
Current maturities of debt | (108,200,000) |  | (122,800,000)
Long-term debt | 679,400,000 |  | 669,400,000
Loss on extinguishment of debt | 200,000 |  |
Face value of long-term debt | 806,300,000 |  |
Estimated fair value of long-term debt | 799,100,000 |  |
Long-term debt: |  |  |
Principal amount | 806,300,000 |  |
Net carrying amount | 787,600,000 |  | 792,200,000
Interest expense |  |  |
Amortization of discount | 2,900,000 | 3,200,000 |
Revolving credit facility expiring April 12, 2016 with interest payable monthly |  |  |
Financing Arrangements |  |  |
Total debt | 300,000,000 |  | 280,000,000
Long-term debt: |  |  |
Net carrying amount | 300,000,000 |  | 280,000,000
Note payable due July 19, 2012 with interest at 7.22%, payable monthly |  |  |
Financing Arrangements |  |  |
Interest rate (as a percent) | 7.22% |  |
Total debt |  |  | 8,400,000
Long-term debt: |  |  |
Net carrying amount |  |  | 8,400,000
Note payable due March 15, 2014 with floating interest rate, payable monthly |  |  |
Financing Arrangements |  |  |
Total debt | 2,200,000 |  | 2,600,000
Long-term debt: |  |  |
Net carrying amount | 2,200,000 |  | 2,600,000
Note payable due March 9, 2017 with floating interest rate, payable semi-annually on June 1 and December 1 |  |  |
Financing Arrangements |  |  |
Total debt | 45,000,000 |  | 50,000,000
Long-term debt: |  |  |
Net carrying amount | 45,000,000 |  | 50,000,000
Notes payable due January 15, 2022 with interest at 7.25% payable semi-annually on January 15 and July 15 |  |  |
Financing Arrangements |  |  |
Interest rate (as a percent) | 7.25% |  |
Total debt | 172,100,000 |  | 172,100,000
Long-term debt: |  |  |
Net carrying amount | 172,100,000 |  | 172,100,000
Mortgage loan (secured by Wood Dale, Illinois facility) due August 1, 2015 with interest at 5.01% |  |  |
Financing Arrangements |  |  |
Interest rate (as a percent) | 5.01% |  |
Total debt | 11,000,000 |  | 11,000,000
Long-term debt: |  |  |
Net carrying amount | 11,000,000 |  | 11,000,000
Convertible notes payable |  |  |
Financing Arrangements |  |  |
Total debt | 200,500,000 |  | 209,500,000
Face value of long-term debt | 216,300,000 |  | 229,300,000
Long-term debt: |  |  |
Principal amount | 216,300,000 |  | 229,300,000
Unamortized discount | (15,800,000) |  | (19,800,000)
Net carrying amount | 200,500,000 |  | 209,500,000
Equity component, net of tax | 74,800,000 |  | 74,800,000
Interest expense |  |  |
Coupon interest | 1,000,000 | 1,200,000 |
Amortization of deferred financing fees | 200,000 | 200,000 |
Amortization of discount | 2,800,000 | 3,200,000 |
Interest expense related to convertible notes | 4,000,000 | 4,600,000 |
Convertible notes payable due February 1, 2026 with interest at 1.75% payable semi-annually on February 1 and August 1 |  |  |
Financing Arrangements |  |  |
Interest rate (as a percent) | 1.75% |  |
Total debt | 88,700,000 |  | 94,900,000
Amount of convertible notes repurchased | 8,000,000 |  |
Cash paid for convertible notes repurchased | 7,900,000 |  |
Long-term debt: |  |  |
Net carrying amount | 88,700,000 |  | 94,900,000
Effective interest rate (as a percent) | 8.48% |  |
Convertible notes payable due March 1, 2014 with interest at 1.625% payable semi-annually on March 1 and September 1 |  |  |
Financing Arrangements |  |  |
Interest rate (as a percent) | 1.625% |  |
Total debt | 69,400,000 |  | 68,500,000
Long-term debt: |  |  |
Net carrying amount | 69,400,000 |  | 68,500,000
Effective interest rate (as a percent) | 6.82% |  |
Convertible notes payable due March 1, 2016 with interest at 2.25% payable semi-annually on March 1 and September 1 |  |  |
Financing Arrangements |  |  |
Interest rate (as a percent) | 2.25% |  |
Total debt | 42,400,000 |  | 46,100,000
Amount of convertible notes repurchased | 5,000,000 |  |
Cash paid for convertible notes repurchased | 4,400,000 |  |
Long-term debt: |  |  |
Net carrying amount | 42,400,000 |  | 46,100,000
Effective interest rate (as a percent) | 7.41% |  |
Industrial revenue bond (secured by trust indenture on property, plant and equipment) due August 1, 2018 with floating interest rate, payable monthly |  |  |
Financing Arrangements |  |  |
Total debt | 25,000,000 |  | 25,000,000
Long-term debt: |  |  |
Net carrying amount | 25,000,000 |  | 25,000,000
Revolving credit facility (secured by aircraft and related engines and components) due April 23, 2015 with floating interest rate, payable monthly |  |  |
Financing Arrangements |  |  |
Total debt | 31,200,000 |  | 33,000,000
Long-term debt: |  |  |
Net carrying amount | 31,200,000 |  | 33,000,000
Revolving credit facility subject to annual review in March with interest payable quarterly |  |  |
Financing Arrangements |  |  |
Total debt | 600,000 |  | 600,000
Long-term debt: |  |  |
Net carrying amount | $ 600,000 |  | $ 600,000

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