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Fair Value Measurements (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 31, 2020
Apr. 30, 2019
Feb. 28, 2019
Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements      
Stock appreciation rights $ 23,613 $ 23,458  
Deferred compensation 1,628 1,695  
Noncontrolling interest holders 8,139 12,498  
Contingent consideration 13,067 12,354  
Interest rate cap | Fair Value, Measurements, Recurring | Level 2      
Fair Value Measurements      
Derivative liabilities 18,982 $ 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 $ 1,600