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Income Taxes (Income (Loss) Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Income Tax Disclosure [Abstract]      
Swiss $ 984,185 $ 238,303 $ 212,986
Non-Swiss 163,935 86,023 58,147
Income before income taxes $ 1,148,120 $ 324,326 $ 271,133