XML 31 R69.htm IDEA: XBRL DOCUMENT v3.20.2
Stock-Based Compensation Expense and Shareholders' Equity (Details 5) - $ / shares
12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
TSR PSUs      
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 2 years 10 months 17 days
Risk-free interest rate 1.46% 2.79% 1.44%
Expected volatility of the Company 28.40% 27.20% 28.00%
Average expected volatility of the peer companies in the S&P Index 37.00% 33.00% 34.70%
Expected dividend yield (as a percent) 0.00% 0.00% 0.00%
Stock Awards      
Summary of assumptions for fair value of employee stock option estimates      
Expected term (in years)     1 year 3 months 7 days
Risk-free interest rate     1.48%
Expected volatility of the Company     24.12%
Expected dividend yield (as a percent)     0.00%
Weighted average grant date fair value of options granted (in dollars per share)     $ 67.90