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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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- Definition Fair Value Liabilities Measured On Recurring Basis [Abstract] + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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