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Long-Term Obligations - Schedule of Maturities of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jul. 31, 2017
Jul. 31, 2016
Debt Disclosure [Abstract]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months $ 0  
Long-term Debt, Maturities, Repayments of Principal in Year Two 0  
Long-term Debt, Maturities, Repayments of Principal in Year Three 53,202  
Long-term Debt, Maturities, Repayments of Principal in Year Four 51,334  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term debt $ 104,536 $ 211,982