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Long-Term Debt - Term Loan Facility (Details)
$ in Thousands
12 Months Ended
Apr. 22, 2021
USD ($)
Mar. 06, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 01, 2018
USD ($)
Apr. 30, 2021
USD ($)
loan
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Debt Instrument [Line Items]              
Loan repayment         $ 869,427 $ 0 $ 571,840
Long-term debt, gross         989,386    
Write-off of debt discount and deferred financing fees         4,606 1,331 $ 0
Term Loan Facility              
Debt Instrument [Line Items]              
Loan amortization installments         $ 1,300    
Loan amortization installments (as a percent)         0.25%    
Borrowing interest rate (as a percent)         2.61%    
Loan repayment       $ 571,800      
Repayments of debt   $ 50,000 $ 50,000        
Long-term debt, gross $ 511,000       $ 509,722 876,903  
Write-off of debt discount and deferred financing fees           $ 1,300  
Third Amendment              
Debt Instrument [Line Items]              
Debt instrument, face amount       $ 996,800      
Third Amendment | LIBOR              
Debt Instrument [Line Items]              
Margin added to variable rate (as a percent)       2.75%      
Variable rate floor (as a percent)       0.00%      
Fourth Amendment              
Debt Instrument [Line Items]              
Write-off of debt discount and deferred financing fees         $ 4,600    
Fourth Amendment | LIBOR              
Debt Instrument [Line Items]              
Margin added to variable rate (as a percent) 2.50%            
Variable rate floor (as a percent) 0.00%            
Minimum | Term Loan Facility              
Debt Instrument [Line Items]              
Number of incremental loans | loan         1    
Maximum | Term Loan Facility              
Debt Instrument [Line Items]              
Fixed amount of incremental loan         $ 100,000