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Fair Value Measures (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Oct. 31, 2019
Jul. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 13,958 $ 12,389
Assets, Fair Value Disclosure 13,958 12,389
Total Liabilities 420,602 411,510
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 13,958 12,389
Total Liabilities 420,602 411,510
Fixed Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term variable rate debt, including current portion 420,602 411,510
Long-term fixed rate debt, including current portion 420,602 411,510
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 420,602 411,510
Long-term fixed rate debt, including current portion $ 420,602 $ 411,510