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Shareholders' Equity - Narrative (Details)	1 Months Ended	3 Months Ended				6 Months Ended
	Mar. 31, 2017 USD ($) shares	Sep. 30, 2018 USD ($) SFr / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 SFr / shares	Sep. 30, 2017 USD ($) $ / shares	Sep. 30, 2018 USD ($) SFr / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 SFr / shares	Sep. 30, 2017 USD ($) $ / shares	Mar. 31, 2018 shares
Stockholders' Equity Note [Abstract]
Authorized amount in buyback program | $	$ 250,000,000.0
Shares authorized to be repurchased (in shares)	17,300,000.0
Period to complete share repurchase program	3 years
Remaining authorized shares amount | $		$ 200,000,000	$ 200,000,000			$ 200,000,000	$ 200,000,000
Cash dividend per share (in dollars per share) | (per share)		$ 0.67	$ 0.69	SFr 0.61	$ 0.63	$ 0.67	$ 0.69	SFr 0.61	$ 0.63
Cash dividend declared (in dollars per share) | (per share)		$ 0.67	$ 0.69	SFr 0.61	$ 0.63	$ 0.67	$ 0.69	SFr 0.61	$ 0.63
Payment of cash dividends | $			$ 114,000,000		$ 104,200,000		$ 113,971,000		$ 104,248,000
Conditional capital reserve (in shares)							25,000,000
Conditional capital reserve to cover convertible debt conversion (in shares)							25,000,000
Authorized issuable new registered shares (in shares)		34,621,324	34,621,324			34,621,324	34,621,324			0

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