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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, 2016
Apr. 30, 2015
Debt Instrument    
2017 $ 15,375  
2018 15,396  
2019 15,417  
2020 15,441  
2021 569,464  
Thereafter 207,151  
Long-term debt 838,244 $ 853,643
Capital Leases    
Debt Instrument    
2017 375  
2018 396  
2019 417  
2020 441  
2021 464  
Thereafter 7,151  
Long-term debt 9,244  
Senior Notes    
Debt Instrument    
2017 15,000  
2018 15,000  
2019 15,000  
2020 15,000  
2021 569,000  
Thereafter 200,000  
Long-term debt $ 829,000