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Equity Plans - Share Based Awards (Details) - $ / shares
shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 27, 2020
Jan. 31, 2020
Feb. 28, 2019
Jan. 31, 2019
Feb. 27, 2020
Feb. 28, 2019
Feb. 27, 2020
Feb. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares available for future awards (in shares) 92       92   92  
Restricted stock awards                
Restricted Stock Awards activity                
Restricted stock award shares granted (in shares)         0 0 8 6
Weighted-average grant-date fair value per share (in dollars per share)         $ 54.71 $ 37.01 $ 46.38 $ 39.83
Employee stock purchase plan (ESPP)                
Restricted Stock Awards activity                
Weighted-average grant-date fair value per share (in dollars per share) $ 14.43   $ 10.92          
ESPP Shares Issued   2   1        
ESPP Shares Issued, Price Per Share   $ 38.16   $ 32.50        
Average expected life in years 6 months   6 months          
Weighted-average expected volatility 43.00%   47.00%          
Weighted-average risk free interest rate 1.50%   2.50%          
Expected dividend yield 0.00%   0.00%