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Shareholders' Equity (Narrative) (Details) SFr / shares in Units, $ / shares in Units, SFr in Millions	1 Months Ended									12 Months Ended
	Apr. 30, 2021 USD ($)	Apr. 30, 2021 CHF (SFr)	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2020 SFr / shares	May 31, 2020 USD ($) shares	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2019 SFr / shares	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2018 SFr / shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares	Mar. 31, 2019 USD ($) $ / shares	Mar. 31, 2021 CHF (SFr) SFr / shares shares	Dec. 31, 2020 shares	Mar. 31, 2020 SFr / shares shares	Dec. 31, 2018 shares	Mar. 31, 2017 USD ($) shares
Shareholder's equity
Nominal share capital issued (CHF) | SFr													SFr 43.3
Conditionally authorized shares (in shares) | shares										173,106,620			173,106,620	17,310,662		34,621,324
Shares, par value (in CHF per share) | SFr / shares													SFr 0.25		SFr 0.25
Treasury shares (in shares) | shares										4,798,723			4,798,723		6,210,000
Dividends
Unappropriated retained earnings										$ 1,109,100,000			SFr 1,046.5
Payment of cash dividends			$ 146,700,000			$ 124,200,000		$ 114,000,000.0		$ 146,705,000	$ 124,180,000	$ 113,971,000
Cash dividends per share (in dollars/CHF per share) | (per share)			$ 0.87	SFr 0.79		$ 0.74	SFr 0.73	$ 0.69	SFr 0.67	$ 0.87	$ 0.74	$ 0.69
Legal Reserves
Minimum percentage of annual net income to be retained in legal reserves										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										20.00%			20.00%
Portion of appropriated retained earnings representing legal reserves										$ 10,200,000
Share Repurchases
Reclassification of currency translation loss included in other income (expense), net										$ 1,738,000	$ 0	$ 510,000
Subsequent Event
Dividends
Payment of cash dividends	$ 155,800,000	SFr 147.0
Common Stock Capital Shares Reserved For Future Issuance Employee Equity Incentive Plans
Shareholder's equity
Conditionally authorized shares (in shares) | 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
Conditionally authorized shares (in shares) | shares										25,000,000			25,000,000
March 2017 program
Share Repurchases
Share repurchase, authorized amount										$ 250,000,000							$ 250,000,000.0
Shares approved (in shares) | shares										17,311,000			17,311,000				17,300,000
Amount of authorized shares available for repurchase										$ 85,400,000
May 2020
Share Repurchases
Share repurchase, authorized amount										$ 250,000,000
Shares approved (in shares) | shares					17,300,000					17,311,000			17,311,000
Period for which repurchase program will remain in effect					3 years
May 2020 | Subsequent Event
Share Repurchases
Increase in authorized amount	750,000,000.0
April 2021
Share Repurchases
Share repurchase, authorized amount					$ 250,000,000.0
April 2021 | Subsequent Event
Share Repurchases
Share repurchase, authorized amount	$ 1,000,000,000.0

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