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Fair Value Measures (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Jul. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 513,092 $ 11,483
Total Liabilities 399,725 399,698
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents, at Carrying Value 513,092 11,483
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 519,064 11,483
Assets, Fair Value Disclosure 519,064 11,483
Total Liabilities 427,267 449,731
Fixed Rate Debt | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt 399,725 399,698
Fixed Rate Debt | Fair Value, Measurements, Recurring | 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 427,267 449,731
Long-term fixed rate debt, including current portion $ 427,267 $ 449,731