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Stock-Based Compensation Expense and Shareholders' Equity (Details 3) - TSR PSUs
9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Summary of assumptions for fair value of employee stock option estimates    
Expected term (in years) 2 years 10 months 24 days 2 years 10 months 17 days
Risk-free interest rate 1.50% 2.80%
Expected volatility of the Company 28.40% 27.20%
Average expected volatility of the peer companies in the S&P Index 37.00% 33.00%
Expected dividend yield 0.00% 0.00%