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Stockholders' Equity - Repurchase Programs (Details) - 2015 And 2017 Stock Repurchase Plans - USD ($)
1 Months Ended 6 Months Ended 46 Months Ended
Nov. 02, 2018
Sep. 30, 2018
Nov. 02, 2018
Class of Stock [Line Items]      
Repurchased stock acquired average cost per share (in dollars per share)   $ 117.03  
Shares repurchased (in shares)   1,151,260  
Dollar value of shares repurchased   $ 134,735,000  
Subsequent Event      
Class of Stock [Line Items]      
Repurchased stock acquired average cost per share (in dollars per share) $ 106.88   $ 87.01
Shares repurchased (in shares) 249,439   5,123,201
Dollar value of shares repurchased $ 26,660,000   $ 445,788,000
Dollar value of shares that may yet be repurchased $ 89,212,000   $ 89,212,000