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Fair Value Measurements (Details) - USD ($)
$ in Thousands
6 Months Ended
Oct. 31, 2019
Apr. 30, 2019
Feb. 28, 2019
Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements      
Stock appreciation rights $ 23,960 $ 23,458  
Deferred compensation 1,681 1,695  
Noncontrolling interest holders 8,404 12,498  
Contingent consideration 12,991 12,354  
Interest rate cap | Fair Value, Measurements, Recurring | Level 2      
Fair Value Measurements      
Derivative liabilities 18,265 $ 5,613  
Interest rate swap agreements | First Lien Loan      
Derivative instruments      
Notional amount     $ 500,000
Interest rate swap agreements | LIBOR | First Lien Loan      
Derivative instruments      
Fixed interest rate     2.46%
Selling, general and administrative expenses | Titan      
Fair Value Measurements      
Contingent consideration expense $ 400