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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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