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Income Taxes - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Current:      
Federal $ 4,885 $ 7,163 $ 8,001
State and local 754 1,269 1,769
Foreign 400 463 580
Total current income tax expense 6,039 8,895 10,350
Deferred:      
Federal 6,589 3,654 24,180
State and local 1,315 17,917 (496)
Foreign 25 94 (701)
Total deferred income tax expense 7,929 21,665 22,983
Total income tax expense $ 13,968 $ 30,560 $ 33,333