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Stock-Based Compensation Expense and Shareholders' Equity (Details 3) - TSR PSUs
3 Months Ended
Oct. 31, 2019
Summary of assumptions for fair value of employee stock option estimates  
Expected term (in years) 2 years 10 months 24 days
Risk-free interest rate 1.50%
Expected volatility of the Company 28.40%
Average expected volatility of the peer companies in the S&P Index 37.00%
Expected dividend yield 0.00%