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Fair Value Measurements (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Apr. 30, 2018
Fair Value Measurements      
Change in fair value of financial instruments $ (6,019) $ (196)  
Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements      
Contingent consideration 14,191   $ 16,170
Stock appreciation rights 22,278   21,944
Deferred compensation 1,599   2,222
Noncontrolling interest holders 12,200    
Interest rate cap | Fair Value, Measurements, Recurring | Level 2      
Fair Value Measurements      
Derivative assets 239   543
Forward currency forward      
Fair Value Measurements      
Change in fair value of financial instruments (5,700)    
Forward currency forward | Fair Value, Measurements, Recurring | Level 2      
Fair Value Measurements      
Derivative liabilities     $ 5,108
Titan      
Fair Value Measurements      
Assumed contingent consideration arrangements 12,000    
Selling, general and administrative expenses | Titan      
Fair Value Measurements      
Contingent consideration expense $ 200