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Income Taxes (Income (Loss) Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]      
Swiss $ 177,935 $ 161,544 $ 80,572
Non-Swiss 54,330 53,445 50,900
Income from continuing operations before income taxes $ 232,265 $ 214,989 $ 131,472