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Debt (Details) - Schedule of debt (Parentheticals) | Feb. 28, 2014 | May 31, 2013 | Feb. 28, 2013
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Notes Due 2013 [Member] |  |  |
Debt (Details) - Schedule of debt (Parentheticals) [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.00%
Line of Credit [Member] |  |  |
Debt (Details) - Schedule of debt (Parentheticals) [Line Items] |  |  |
Lines of credit weighted average interest rate | 4.80% | 9.00% | 8.90%
Revolving Credit Facility |  |  |
Debt (Details) - Schedule of debt (Parentheticals) [Line Items] |  |  |
Line of Credit Facility, Interest Rate at Period End | 1.30% |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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