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Shareholders' Equity (Narrative) (Details)
SFr / shares in Units, $ / shares in Units, SFr in Millions
 1 Months Ended 12 Months Ended
May 31, 2023
SFr / shares
May 31, 2023
USD ($)
$ / shares
Sep. 30, 2022
SFr / shares
Sep. 30, 2022
USD ($)
$ / shares
Jul. 31, 2022
USD ($)
shares
Sep. 30, 2021
SFr / shares
Sep. 30, 2021
USD ($)
$ / shares
Apr. 30, 2021
USD ($)
Sep. 30, 2020
SFr / shares
Sep. 30, 2020
USD ($)
$ / shares
Mar. 31, 2023
USD ($)
$ / shares
shares
Mar. 31, 2022
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
Mar. 31, 2023
CHF (SFr)
SFr / shares
shares
Mar. 31, 2022
SFr / shares
shares
Dec. 31, 2020
shares
May 31, 2020
USD ($)
shares
Shareholder's equity                                  
Nominal share capital issued (CHF) | SFr                           SFr 43.3      
Common stock outstanding (in shares)                     173,106,620     173,106,620      
Conditionally authorized shares (in shares)                               17,310,662  
Shares, par value (in CHF per share) | SFr / shares                           SFr 0.25 SFr 0.25    
Treasury shares (in shares)                     13,763,347     13,763,347      
Shares that may be issued out of conditional capital (in shares)                     50,000,000     50,000,000 50,000,000    
Dividends                                  
Unappropriated retained earnings                     $ 1,300,000,000     SFr 1,200.0      
Cash dividends paid per share (in dollars/CHF per share) | (per share)     SFr 0.96 $ 0.98   SFr 0.87 $ 0.95   SFr 0.79 $ 0.87 $ 1.00 $ 0.95 $ 0.87        
Payment of cash dividends | $       $ 158,700,000     $ 159,400,000     $ 146,700,000 $ 158,680,000 $ 159,410,000 $ 146,705,000        
Legal Reserves                                  
Minimum percentage of annual net income to be retained in legal reserves (as a percent)                     5.00%            
Threshold of legal reserves as a percentage of issued and outstanding aggregate par value per share capital at which a minimum percentage of annual net income is no longer required to be retained (as a percent)                     20.00%     20.00%      
Portion of appropriated retained earnings representing legal reserves | $                     $ 10,400,000            
Subsequent event                                  
Dividends                                  
Cash dividends declared per share (in dollars/CHF per share) | (per share) SFr 1.06 $ 1.16                              
Common stock dividends | $   $ 184,200,000                              
May 2020                                  
Share Repurchases                                  
Share repurchase, authorized amount (up to) | $         $ 1,500,000,000     $ 1,000,000,000     $ 1,500,000,000           $ 250,000,000
Shares approved (in shares) (up to)         17,300,000           17,311,000     17,311,000     17,300,000
Increase in authorized amount | $         $ 500,000,000     $ 750,000,000                  
Period for which repurchase program will remain in effect (in years)         3 years                        
Amount of authorized shares available for repurchase | $                     $ 505,800,000            
Common Stock Capital Shares Reserved For Future Issuance Employee Equity Incentive Plans                                  
Shareholder's equity                                  
Shares that may be issued out of conditional capital (in shares)                     25,000,000     25,000,000      
Common Stock Capital Shares Reserved For Future Issuance Conversion Rights Under Future Convertible Bond Issuance                                  
Shareholder's equity                                  
Shares that may be issued out of conditional capital (in shares)                     25,000,000     25,000,000