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Income Taxes (Provision for (Benefit From) Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Current:      
Swiss $ 3,526 $ 1,934 $ 1,668
Non-Swiss 13,142 9,774 (2,582)
Deferred:      
Non-Swiss 7,055 (2,595) 4,024
Provision for income taxes $ 23,723 $ 9,113 $ 3,110