Capital Band Provision, Adjustment To Capital Shares

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Capital Band Provision, Adjustment To Capital Shares, Period

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Legal Reserves Threshold At Which Annual Net Income Not Required To Be Retained

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Number Of Shares Issuable Out Of Conditional Capital

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Represents the minimum percentage of annual net income to be retained in legal reserves.

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A segregation of the portion of retained earnings which is unavailable for dividend distribution representing legal reserves.

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Share Repurchase Program, Increase In Authorized Amount

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Stock Repurchase Program, Threshold, Maximum Shares Available For Purchase

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Stock Repurchase Program, Threshold, Maximum Shares Held, Percentage

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Treasury Stock, Shares Acquired For Cancellation

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Treasury Stock, Shares Acquired for Equity Incentive Plans or Potential Acquisitions

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- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
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-Section 50
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Number of shares authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Value of common shares held by shareholders. Excludes common shares repurchased and held as treasury shares.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings.

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Amount of accumulated undistributed earnings (deficit) available for dividend distribution. Includes, but is not limited to, retained earnings not appropriated for specific business purpose.

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Period share may be purchased under authorized share repurchase plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

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Shareholders' Equity - Narrative (Details) SFr / shares in Units, $ / shares in Units, $ in Thousands, SFr in Millions			1 Months Ended												12 Months Ended
	Sep. 30, 2025 shares	Sep. 30, 2023 shares	May 31, 2026 SFr / shares	May 31, 2026 USD ($) $ / shares	Mar. 31, 2026 USD ($) shares	Sep. 30, 2025 SFr / shares shares	Sep. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2025 USD ($) shares	Mar. 31, 2025 USD ($)	Sep. 30, 2024 SFr / shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 SFr / shares shares	Sep. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2023 USD ($)	Mar. 31, 2026 USD ($) $ / shares shares	Mar. 31, 2025 USD ($) $ / shares	Mar. 31, 2024 USD ($) $ / shares	Mar. 31, 2026 CHF (SFr) SFr / shares shares	Mar. 31, 2025 SFr / shares	Mar. 31, 2025 USD ($) shares	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	May 31, 2020 USD ($)
Shareholder's equity
Common stock outstanding					$ 28,001										$ 28,001			SFr 40.2		$ 29,432
Shares issued (in shares)					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)					17,281,896										17,281,896			17,281,896		20,485,000
Adjusted share capital period (in years)	5 years	5 years
Unappropriated retained earnings					$ 1,966,600										$ 1,966,600			SFr 1,573.5
Cash dividends per share (in dollars per share) \| $ / shares															$ 1.58	$ 1.37	$ 1.19
Cash dividends per share (in dollars per share) \| (per share)						SFr 1.26	$ 1.58			SFr 1.16	$ 1.37	SFr 1.06	$ 1.16
Payment of cash dividends \| $							$ 233,100				$ 207,900		$ 182,300		$ 233,059	$ 207,853	$ 182,305
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 \| $					$ 12,000										$ 12,000
Maximum percentage of shares held by the company and its subsidiaries					10.00%										10.00%			10.00%
Maximum shares available for purchase (in shares)					16,100,000										16,100,000			16,100,000
Shares acquired for cancellation (in shares)															4,700,000
Shares acquired for equity incentive plans or potential acquisitions (in shares)															12,600,000
Forecast
Shareholder's equity
Cash dividends per share (in dollars per share) \| (per share)			SFr 1.36	$ 1.70
Common stock dividends \| $				$ 243,900
2023 Share Repurchase Program
Shareholder's equity
Cancellation of treasury shares (in shares)								8,200,000			4,100,000
Treasury shares repurchased \| $								$ 712,200			$ 332,100
Share repurchase, authorized amount (up to) \| $														$ 1,000,000						$ 1,600,000
Period for which repurchase program will remain in effect (in years)														3 years
Increase in authorized amount under share repurchase program \| $									$ 600,000
Amount of authorized shares available for repurchase \| $					$ 91,800										$ 91,800
2020 Share Repurchase Program
Shareholder's equity
Share repurchase, authorized amount (up to) \| $																					$ 1,500,000	$ 1,500,000	$ 250,000
2026 Share Repurchase Program
Shareholder's equity
Share repurchase, authorized amount (up to) \| $					$ 1,400,000										$ 1,400,000
Period for which repurchase program will remain in effect (in years)					3 years
Shares approved (in shares)					16,078,446										16,078,446			16,078,446
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)	144,706,014	155,795,958				144,706,014	144,706,014					155,795,958	155,795,958
Maximum
Shareholder's equity
Number of adjusted share capital (in shares)	176,862,906	190,417,282				176,862,906	176,862,906					190,417,282	190,417,282