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Fair Value of Financial Instruments and Long Term Debt - Schedule of Maturities of Long-Term Debt Including Capitalizied Leases (Details) - USD ($)
$ in Thousands
Apr. 30, 2018
Apr. 30, 2017
Debt Instrument    
2019 $ 15,374  
2020 15,395  
2021 569,416  
2022 409  
2023 20,431  
Thereafter 686,074  
Long-term debt 1,307,099 $ 922,777
Capital Leases    
Debt Instrument    
2019 374  
2020 395  
2021 416  
2022 409  
2023 431  
Thereafter 6,074  
Long-term debt 8,099  
Senior Notes    
Debt Instrument    
2019 15,000  
2020 15,000  
2021 569,000  
2022 0  
2023 20,000  
Thereafter 680,000  
Long-term debt $ 1,299,000