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Debt (Tables) | 9 Months Ended
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Feb. 28, 2014
Debt Disclosure [Abstract] |
Schedule of Debt [Table Text Block] | The following table summarizes debt as of the dates indicated:
| Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
| February 28, 2014 |  | May 31, 2013 |  | February 28, 2013
Loan Agreement: |  |  |  |  |  |  |  |  |  |  |
Revolving Loan (interest rate of 1.3%) | $ | 175.0 |  |  | $ | 175.0 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Unsecured lines of credit (weighted average interest rates of 4.8%, 9.0% and 8.9%, respectively) | $ | 4.7 |  |  | $ | 4.7 |  |  | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 1.8 |  |  | $ | 1.8 |
5% Notes due 2013, net of discount | — |  |  | — |  |  | — |  |  | — |  |  | 153.0 |  |  | 153.0 |
Total debt | $ | 179.7 |  |  | $ | 179.7 |  |  | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 154.8 |  |  | $ | 154.8 |
Less lines of credit, short-term debt and current portion of long-term debt | (4.7 | ) |  | (4.7 | ) |  | (2.0 | ) |  | (2.0 | ) |  | (1.8 | ) |  | (1.8 | )
Total long-term debt | $ | 175.0 |  |  | $ | 175.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 153.0 |  |  | $ | 153.0 |
Schedule of Maturities of Long-term Debt [Table Text Block] | The following table sets forth the maturities of the Company’s debt obligations as of February 28, 2014, for the twelve-month periods ending February 28,
2015 | $ | 4.7 |
2016 | $ | — |
2017 | $ | — |
2018 | $ | 175.0 |
Total debt | $ | 179.7 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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