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Fair Value Measures (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Apr. 30, 2020
Jul. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 8,933 $ 12,389
Assets, Fair Value Disclosure 8,933 12,389
Total Liabilities 447,908 411,510
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 8,933 12,389
Assets, Fair Value Disclosure 8,933 12,389
Total Liabilities 447,908 411,510
Fixed Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term variable rate debt, including current portion 447,908 411,510
Long-term fixed rate debt, including current portion 447,908 411,510
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 447,908 411,510
Long-term fixed rate debt, including current portion $ 447,908 $ 411,510