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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details 3) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	$ 38,275	$ 47,384	$ 67,331
Potential amount of undiscounted future contingent consideration	$ 40,800
Summary showing the recurring fair value measurements of the contingent consideration liability
Discount rate used in fair value calculation	12.50%
Level 3 | Contingent liability for acquisition earn out | Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	$ 38,275
Revenue based payments | Level 3 | Contingent liability for acquisition earn out | Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	$ 35,325
Summary showing the recurring fair value measurements of the contingent consideration liability
Discount rate used in fair value calculation	4.00%
Revenue based payments | Level 3 | Minimum | Contingent liability for acquisition earn out | Recurring
Summary showing the recurring fair value measurements of the contingent consideration liability
Probability of payment	75.00%
Revenue based payments | Level 3 | Maximum | Contingent liability for acquisition earn out | Recurring
Summary showing the recurring fair value measurements of the contingent consideration liability
Probability of payment	100.00%
Milestone based payments | Level 3 | Contingent liability for acquisition earn out | Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration liability at fair value	$ 2,950
Summary showing the recurring fair value measurements of the contingent consideration liability
Discount rate used in fair value calculation	16.00%
Milestone based payments | Level 3 | Minimum | Contingent liability for acquisition earn out | Recurring
Summary showing the recurring fair value measurements of the contingent consideration liability
Probability of payment	75.00%
Milestone based payments | Level 3 | Maximum | Contingent liability for acquisition earn out | Recurring
Summary showing the recurring fair value measurements of the contingent consideration liability
Probability of payment	100.00%

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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