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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

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+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Fair value measurement with unobservable inputs reconciliations recurring basis contingent payment.

+ References

No definition available.

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- Definition

Fair value measurement with unobservable inputs reconciliations recurring basis value.

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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

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