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Fair Value Measures Fair Value Measures (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Jul. 31, 2018
Jul. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure $ 130,769 $ 3,498
Assets, Fair Value Disclosure 130,769 3,498
Financial and Nonfinancial Liabilities, Fair Value Disclosure 381,230 631,908
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and Cash Equivalents, Fair Value Disclosure 130,769 3,498
Financial and Nonfinancial Liabilities, Fair Value Disclosure 381,230 631,908
Variable Rate Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term Debt, Fair Value 0 231,000
Fixed Rate Debt [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value 381,230 400,908
Fixed Rate Debt [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Fair Value $ 381,230 $ 400,908