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Fair Value Measures (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Apr. 30, 2017
Jul. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 10,804 $ 8,422
Total Assets 10,804 8,422
Total Liabilities 566,266 668,375
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 10,804 8,422
Total Assets 10,804 8,422
Total Liabilities 566,266 668,375
Fixed Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term variable rate debt, including current portion 401,266 430,375
Long-term fixed rate debt, including current portion 401,266 430,375
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 401,266 430,375
Long-term fixed rate debt, including current portion 401,266 430,375
Variable Rate Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Revolving loan facility $ 165,000 $ 238,000