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Shareholders' Equity - Narrative (Details)
$ / shares in Units, shares in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 39 Months Ended
Jun. 30, 2023
USD ($)
shares
Jul. 31, 2022
USD ($)
Apr. 30, 2021
USD ($)
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
SFr / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
Sep. 30, 2022
SFr / shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
SFr / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
Sep. 30, 2022
SFr / shares
Jul. 27, 2023
USD ($)
shares
Mar. 31, 2023
shares
May 31, 2020
USD ($)
Class of Stock [Line Items]                            
Stock repurchased (in shares) | shares               900            
Aggregate purchase price       $ 124,096,000   $ 116,942,000   $ 219,172,000   $ 237,561,000        
Maximum percentage of shares held by the company and its subsidiaries 10.00%                          
Maximum shares available for purchase (in shares) | shares 17,300                          
Stock repurchase program, cancel, percentage               10.00%            
Treasury, at cost, shares (in shares) | shares       16,029 16,029     16,029 16,029       13,763  
Cash dividends per share (in dollars per share) | (per share)       $ 1.19 SFr 1.06 $ 1.00 SFr 0.96 $ 1.19 SFr 1.06 $ 1.00 SFr 0.96      
Payment of cash dividends       $ 187,199,000   $ 162,681,000   $ 187,199,000   $ 162,681,000        
2020 Share Repurchase Program                            
Class of Stock [Line Items]                            
Authorized amount in buyback program   $ 1,500,000,000 $ 1,000,000,000                     $ 250,000,000
Increase in authorized amount   $ 500,000,000 $ 750,000,000                      
Stock repurchased (in shares) | shares               2,600       16,700    
Aggregate purchase price               $ 159,100,000       $ 1,200,000,000    
2023 Share Repurchase Program                            
Class of Stock [Line Items]                            
Authorized amount in buyback program $ 1,000,000,000                          
Stock repurchased (in shares) | shares               900            
Aggregate purchase price               $ 60,100,000            
Period to complete share repurchase program 3 years                          
Aggregate cost of share               30,200,000            
Amount available for repurchase       $ 940,000,000.0 SFr 940,000,000.0     $ 940,000,000.0 SFr 940,000,000.0