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Income Taxes (Income (Loss) Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]      
Swiss $ 212,986 $ 177,935 $ 161,544
Non-Swiss 58,147 54,330 53,445
Income before income taxes $ 271,133 $ 232,265 $ 214,989