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Debt (Tables) | 3 Months Ended
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Aug. 31, 2013
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 |
|  | August 31, 2013 |  |  | May 31, 2013 |  |  | August 31, 2012 |
Unsecured lines of credit (weighted average interest rates of 3.6%, 9.0% and 4.9%, respectively) |  | $ | 14.2 |  |  | $ | 14.2 |  |  | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 0.6 |  |  | $ | 0.6 |
Loan Agreement: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Loan (interest rates of 1.4%, n/a and n/a, respectively) |  |  | 15.0 |  |  |  | 15.0 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Term Loan |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
5% Notes due 2013, net of discount |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 152.8 |  |  |  | 153.6 |
Total debt |  | $ | 29.2 |  |  | $ | 29.2 |  |  | $ | 2.0 |  |  | $ | 2.0 |  |  | $ | 153.4 |  |  | $ | 154.2 |
Less lines of credit, short-term debt and current portion of long-term debt |  |  | (29.2 | ) |  |  | (29.2 | ) |  |  | (2.0 | ) |  |  | (2.0 | ) |  |  | (0.6 | ) |  |  | (0.6 | )
Total long-term debt |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 152.8 |  |  | $ | 153.6 |
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 August 31, 2013, for the twelve-month period ending August 31,
2014 |  | $ | 29.2 |
2015 |  |  | — |
Total debt |  | $ | 29.2 |

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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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