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Stock Compensation - RSU and PSU award activity (Details) - $ / shares
1 Months Ended 3 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Apr. 30, 2019
Jul. 31, 2018
Jun. 30, 2018
Mar. 31, 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)           3,585,380
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)           $ 87.74
Restricted Stock Units (RSUs)            
Shares Subject to Outstanding Options, Shares            
Granted (in shares)         190,000 485,381
Released (in shares)           (94,189)
Cancelled (in shares)           (88,895)
Shares Subject to Outstanding Options, Weighted Average Exercise Price            
Granted (in dollars per share)           $ 90.35
Released (in dollars per share)           86.45
Cancelled (in dollars per share)           $ 92.15
Performance Stock Units (PSUs)            
Shares Subject to Outstanding Options, Shares            
Granted (in shares) 92,347 86,975 100,000 77,243 446,500  
Cancelled (in shares)           (1,500)
Shares Subject to Outstanding Options, Weighted Average Exercise Price            
Cancelled (in dollars per share)           $ 65.76