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Income Taxes (Income (Loss) Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Income Tax Disclosure [Abstract]      
Swiss $ 282,970 $ 579,258 $ 984,185
Non-Swiss 180,552 196,560 163,935
Income before income taxes $ 463,522 $ 775,818 $ 1,148,120