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Shareholders' Equity - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2022
USD ($)
shares
Apr. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
SFr / shares
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2021
SFr / shares
Sep. 30, 2022
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
SFr / shares
Sep. 30, 2021
USD ($)
$ / shares
Sep. 30, 2021
SFr / shares
May 31, 2020
USD ($)
shares
Class of Stock [Line Items]                      
Cash dividends per share (in dollars per share) | (per share)     $ 1.00 SFr 0.96 $ 0.95 SFr 0.87 $ 1.00 SFr 0.96 $ 0.95 SFr 0.87  
Payment of cash dividends     $ 162,681,000   $ 159,410,000   $ 162,681,000   $ 159,410,000    
May 2020                      
Class of Stock [Line Items]                      
Authorized amount in buyback program $ 1,500,000,000 $ 1,000,000,000                 $ 250,000,000
Shares authorized to be repurchased (in shares) | shares 17,300,000                   17,300,000
Increase in authorized amount $ 500,000,000 $ 750,000,000                  
Amount available for repurchase     $ 686,300,000 SFr 686,300,000     $ 686,300,000 SFr 686,300,000      
Period to complete share repurchase program 3 years