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Fair Value Measures (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Oct. 31, 2016
Jul. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 9,743 $ 8,422
Total Assets 9,743 8,422
Total Liabilities 757,657 668,375
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 9,743 8,422
Total Assets 9,743 8,422
Total Liabilities 757,657 668,375
Fixed Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term variable rate debt, including current portion 415,757 430,375
Long-term fixed rate debt, including current portion 415,757 430,375
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 415,757 430,375
Long-term fixed rate debt, including current portion 415,757 430,375
Variable Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Revolving loan facility $ 341,900 $ 238,000