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Shareholders' Equity - Narrative (Details)
SFr / shares in Units, $ / shares in Units, $ in Thousands, SFr in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2023
shares
Jun. 30, 2025
USD ($)
shares
Mar. 31, 2025
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2025
USD ($)
SFr / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
SFr / shares
Sep. 30, 2024
USD ($)
$ / shares
Sep. 30, 2025
USD ($)
SFr / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
SFr / shares
Sep. 30, 2024
USD ($)
$ / shares
Sep. 30, 2025
CHF (SFr)
SFr / shares
shares
Mar. 31, 2025
SFr / shares
Mar. 31, 2025
USD ($)
shares
Class of Stock [Line Items]                                
Nominal share capital issued (CHF) | SFr                           SFr 40.2    
Shares issued (in shares) 160,784,460         160,784,460 160,784,460     160,784,460 160,784,460     160,784,460   168,994,000
Shares, par value (in CHF per share) | SFr / shares                           SFr 0.25 SFr 0.25  
Treasury, at cost, shares (in shares) 13,889,105         13,889,105 13,889,105     13,889,105 13,889,105     13,889,105   20,485,000
Adjusted share capital period (in years) 5 years 5 years                            
Maximum percentage of shares held by the company and its subsidiaries 10.00%         10.00% 10.00%     10.00% 10.00%     10.00%    
Maximum shares available for purchase (in shares) 16,100,000         16,100,000 16,100,000     16,100,000 16,100,000     16,100,000    
Shares acquired for cancellation (in shares)                     900,000          
Shares acquired for equity incentive plans or potential acquisitions (in shares)                     13,000,000          
Cash dividends per share declared (in dollars per share) | (per share)           SFr 1.26 $ 1.58 SFr 1.16 $ 1.37 SFr 1.26 $ 1.58 SFr 1.16 $ 1.37      
Payment of cash dividends | $             $ 233,100   $ 207,900   $ 233,059   $ 207,853      
Common Stock Capital Shares Reserved For Future Issuance Employee Equity Incentive Plans                                
Class of Stock [Line Items]                                
Shares that may be issued out of conditional capital (in shares) 25,000,000         25,000,000 25,000,000     25,000,000 25,000,000     25,000,000    
Common Stock Capital Shares Reserved For Future Issuance Conversion Rights Under Future Convertible Bond Issuance                                
Class of Stock [Line Items]                                
Shares that may be issued out of conditional capital (in shares) 25,000,000         25,000,000 25,000,000     25,000,000 25,000,000     25,000,000    
Minimum                                
Class of Stock [Line Items]                                
Number of adjusted share capital (in shares) 144,706,014 155,795,958       144,706,014 144,706,014     144,706,014 144,706,014     144,706,014    
Maximum                                
Class of Stock [Line Items]                                
Number of adjusted share capital (in shares) 176,862,906 190,417,282       176,862,906 176,862,906     176,862,906 176,862,906     176,862,906    
2023 Share Repurchase Program                                
Class of Stock [Line Items]                                
Period for which repurchase program will remain in effect (in years)         3 years                      
Share repurchase, authorized amount (up to) | $         $ 1,000,000                     $ 1,600,000
Increase in authorized amount under share repurchase program | $       $ 600,000                        
Amount available for repurchase | $ $ 432,700         SFr 432,700 $ 432,700     SFr 432,700 $ 432,700          
Cancellation of treasury shares (in shares)     8,200,000                          
Treasury shares repurchased | $     $ 712,200