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Income Taxes (Uncertain Tax Liability Activity) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance – beginning of year $ 9,874 $ 10,827 $ 3,651
Additions based on tax positions related to the current year 495 585 7,286
Reductions based on lapse of statute of limitations 0 (650) (110)
Payments and other movements 0 (888) 0
Balance – end of year $ 10,369 $ 9,874 $ 10,827