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v3.25.1

Shareholders' Equity (Narrative) (Details) SFr / shares in Units, $ / shares in Units, $ in Thousands, SFr in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |
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May 31, 2025 SFr / shares | May 31, 2025 USD ($) $ / shares | Mar. 31, 2025 USD ($) shares | Sep. 30, 2024 SFr / shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 SFr / shares | Sep. 30, 2023 USD ($) $ / shares | Jun. 30, 2023 USD ($) | Sep. 30, 2022 SFr / shares | Sep. 30, 2022 USD ($) $ / shares | Mar. 31, 2025 USD ($) $ / shares shares | Mar. 31, 2024 USD ($) $ / shares shares | Mar. 31, 2023 USD ($) $ / shares shares | Mar. 31, 2025 CHF (SFr) SFr / shares shares | Mar. 31, 2024 SFr / shares shares | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | May 31, 2020 USD ($)
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal share capital issued (CHF) | SFr |  |  |  |  |  |  |  |  |  |  |  |  |  | SFr 42.2 |  |  |  |
Common stock outstanding (in shares) |  |  | 168,994,142 |  |  |  |  |  |  |  | 168,994,142 |  |  | 168,994,142 |  |  |  |
Shares, par value (in CHF per share) | SFr / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | SFr 0.25 | SFr 0.25 |  |  |
Shares in treasury, at cost (in shares) |  |  | 20,485,124 |  |  |  |  |  |  |  | 20,485,124 |  |  | 20,485,124 | 19,243,000 |  |  |
Adjusted share capital period (in years) |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Cancellation of treasury shares | $ |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |
Unappropriated retained earnings |  |  | $ 921,800 |  |  |  |  |  |  |  | $ 921,800 |  |  | SFr 812.0 |  |  |  |
Cash dividends per share (in dollars per share) | (per share) |  |  |  | SFr 1.16 | $ 1.37 | SFr 1.06 | $ 1.16 |  | SFr 0.96 | $ 0.98 | $ 1.37 | $ 1.19 | $ 1.00 |  |  |  |  |
Payment of cash dividends | $ |  |  |  |  | $ 207,900 |  | $ 182,300 |  |  | $ 158,700 | $ 207,853 | $ 182,305 | $ 158,680 |  |  |  |  |
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% |  |  | 20.00% |  |  |  |
Portion of appropriated retained earnings representing legal reserves | $ |  |  | $ 10,900 |  |  |  |  |  |  |  | $ 10,900 |  |  |  |  |  |  |
Stock repurchase program, threshold, maximum shares held, percentage |  |  | 10.00% |  |  |  |  |  |  |  | 10.00% |  |  | 10.00% |  |  |  |
Stock repurchase program, threshold, maximum shares available for purchase |  |  | 16,900,000 |  |  |  |  |  |  |  | 16,900,000 |  |  | 16,900,000 |  |  |  |
Purchases of registered shares (in shares) |  |  |  |  |  |  |  |  |  |  | 6,700,000 |  |  |  |  |  |  |
Shares acquired for equity incentive plans or potential acquisitions (in shares) |  |  |  |  |  |  |  |  |  |  | 13,800,000 |  |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per share (in dollars/CHF per share) | (per share) | SFr 1.26 | $ 1.43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | $ |  | $ 212,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2023 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cancellation of treasury shares (in shares) |  |  |  |  | 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cancellation of treasury shares | $ |  |  |  |  | $ 332,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, authorized amount (up to) | $ |  |  | $ 1,600,000 |  |  |  |  | $ 1,000,000 |  |  | $ 1,600,000 |  |  |  |  |  |  |
Increase in authorized amount under share repurchase program | $ |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for which repurchase program will remain in effect (in years) |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Amount of authorized shares available for repurchase | $ |  |  | $ 48,300 |  |  |  |  |  |  |  | $ 48,300 |  |  |  |  |  |  |
Purchases of registered shares (in shares) |  |  |  |  |  |  |  |  |  |  | 6,679,000 | 4,459,000 | 0 |  |  |  |  |
2020 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase, authorized amount (up to) | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 | $ 1,500,000 | $ 250,000
Purchases of registered shares (in shares) |  |  |  |  |  |  |  |  |  |  | 0 | 2,641,000 | 7,562,000 |  |  |  |  |
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 |  |  | 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 |  |  | 25,000,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of adjusted share capital (in shares) |  |  | 155,795,958 |  |  |  |  |  |  |  | 155,795,958 |  |  | 155,795,958 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shareholder's equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of adjusted share capital (in shares) |  |  | 190,417,282 |  |  |  |  |  |  |  | 190,417,282 |  |  | 190,417,282 |  |  |  |

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