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Shareholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Feb. 03, 2021
Oct. 31, 2018
Oct. 26, 2010
Equity, Class of Treasury Stock [Line Items]                
Accelerated Share Repurchases, Settlement (Payment) or Receipt     $ 400,000     $ 500,000    
Accelerated Share Repurchases, Cash or Stock Settlement   449,049 2.1 million   2.5 million      
Treasury Stock Acquired, Average Cost Per Share $ 170.88 $ 199.90 $ 194.91 $ 191.47 $ 199.90      
Adjustments To Additional Paid In Capital, Equity Forward Contract   $ 100,000            
October Twenty Six Two Thousand Ten Program                
Equity, Class of Treasury Stock [Line Items]                
Stock Repurchase Program, Authorized Amount             $ 1,000,000 $ 4,400,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 272,000     $ 272,000