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Fair Value Measures (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Jan. 31, 2019
Jul. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 12,840 $ 130,769
Assets, Fair Value Disclosure 12,840 130,769
Total Liabilities 485,261 381,230
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 12,840 130,769
Total Liabilities 485,261 381,320
Fixed Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term variable rate debt, including current portion 391,961 381,230
Long-term fixed rate debt, including current portion 391,961 381,230
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 391,961 381,320
Long-term fixed rate debt, including current portion 391,961 381,320
Variable Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Revolving loan facility $ 93,300 $ 0