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Basis of Presentation, Business Description and Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
May 31, 2014 | May 31, 2013 | May 31, 2012
Summary showing reconciliation of the contingent payments |  |  |
Contingent payments | $ 15,943 | $ 0 | $ 0
Contingent Consideration Earn Out Liability [Member] |  |  |
Summary showing reconciliation of the contingent payments |  |  |
Balance at May 31, 2013 | 75,049 |  |
Purchase price contingent consideration | 4,970 |  |
Contingent payments | (10,880) |  |
Earnings revaluation gain | (4,994) |  |
Earnings revaluation expense | 3,276 |  |
Balance at May 31, 2014 | $ 67,421 |  |

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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