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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 07, 2015
May 31, 2017
May 31, 2016
May 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Contingent consideration liability at fair value   $ 12,761 $ 38,275 $ 47,384
Potential amount of undiscounted future contingent consideration   13,100    
Purchase of non-transferable warrants $ 2,000      
Revenue based payments | Level 3 | Contingent liability for acquisition earn outs | Recurring        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Contingent consideration liability at fair value   $ 12,761    
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 | Maximum | Contingent liability for acquisition earn outs | Recurring        
Summary showing the recurring fair value measurements of the contingent consideration liability        
Probability of payment   100.00%    
Discontinued Investment in TiLo Product [Member] | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)   $ 3,100    
Discontinued Investment in TiLo Product [Member] | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Abandonment [Member] | In Process Research and Development [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down   3,600    
AngioVac Product [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)   $ 13,400