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Income Taxes - Income (Loss) before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Income Tax Disclosure [Abstract]      
Domestic income before income taxes $ 138,537 $ 128,035 $ 138,290
Foreign income before income taxes 2,207 1,522 1,340
Total income before income taxes $ 140,744 $ 129,557 $ 139,630