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Fair Value Measures (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Jan. 31, 2018
Jul. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 7,571 $ 3,498
Total Assets 7,571 3,498
Total Liabilities 498,005 631,908
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 7,571 3,498
Total Assets 7,571 3,498
Total Liabilities 498,005 631,908
Fixed Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term variable rate debt, including current portion 387,305 400,908
Long-term fixed rate debt, including current portion 387,305 400,908
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 387,305 400,908
Long-term fixed rate debt, including current portion 387,305 400,908
Variable Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Revolving loan facility $ 110,700 $ 231,000