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Fair Value Measures (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Apr. 30, 2019
Jul. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 9,673 $ 130,769
Assets, Fair Value Disclosure 9,673 130,769
Total Liabilities 405,811 381,230
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 9,673 130,769
Total Liabilities 405,811 381,320
Fixed Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term variable rate debt, including current portion 398,811 381,230
Long-term fixed rate debt, including current portion 398,811 381,230
Fixed Rate Debt | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term variable rate debt, including current portion 398,811 381,320
Long-term fixed rate debt, including current portion 398,811 381,320
Variable Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Revolving loan facility $ 7,000 $ 0