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Long-Term Debt - Components (Details) - USD ($)
$ in Thousands
Oct. 31, 2019
Apr. 30, 2019
Long-term debt    
Carrying value of debt $ 1,100,048 $ 1,141,195
Less current portion 45,963 42,118
Long-term debt 1,054,085 1,099,077
First Lien Loan    
Long-term debt    
Carrying value of debt 919,564 972,650
Unamortized discount 1,862 2,149
Deferred financing costs 10,460 12,072
ABL Facility    
Long-term debt    
Carrying value of debt 47,776 43,972
Finance lease obligations    
Long-term debt    
Carrying value of debt 116,510 109,286
Installment notes    
Long-term debt    
Carrying value of debt $ 16,198 $ 15,287
Interest rate 5.00% 5.00%
Unamortized discount $ 1,276 $ 1,200