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Debt (Details) - Schedule of debt (Parentheticals) | May. 31, 2015 | May. 31, 2014 | May. 31, 2013
--- | --- | --- | ---
Debt (Details) - Schedule of debt (Parentheticals) [Line Items] |  |  |
Interest rate | 0.00% | 0.00% | 5.00%
Line of Credit [Member] |  |  |
Debt (Details) - Schedule of debt (Parentheticals) [Line Items] |  |  |
Weighted average interest rate | 3.80% | 2.30% |
Revolving Credit Facility [Member] |  |  |
Debt (Details) - Schedule of debt (Parentheticals) [Line Items] |  |  |
Interest rate | 0.00% | 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 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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