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Stock Compensation - RSU and PSU award activity (Details) - $ / shares
1 Months Ended 9 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Apr. 30, 2019
Jul. 31, 2018
Jun. 30, 2018
Sep. 30, 2021
Shares Subject to Outstanding Options, Shares              
Outstanding at the beginning of the period (in shares)             3,284,583
Outstanding at the end of the period (in shares)             3,634,147
Shares Subject to Outstanding Options, Weighted Average Exercise Price              
Outstanding at the beginning of the period (in dollars per share)             $ 87.42
Outstanding at the end of the period (in dollars per share)             $ 87.07
Restricted Stock Units (RSUs)              
Shares Subject to Outstanding Options, Shares              
Granted (in shares)           190,000 1,764,067
Released (in shares)             (830,436)
Cancelled (in shares)             (324,075)
Shares Subject to Outstanding Options, Weighted Average Exercise Price              
Granted (in dollars per share)             $ 85.12
Released (in dollars per share)             87.89
Cancelled (in dollars per share)             $ 90.23
Performance Stock Units (PSUs)              
Shares Subject to Outstanding Options, Shares              
Granted (in shares) 107,088 92,347 86,975 100,000 77,243 446,500 107,088
Released (in shares)             (200,353)
Cancelled (in shares)             (166,727)
Shares Subject to Outstanding Options, Weighted Average Exercise Price              
Granted (in dollars per share)             $ 83.58
Released (in dollars per share)             68.08
Cancelled (in dollars per share)             $ 72.60