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Income Taxes (Reconciliation of Effective Tax Rate) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]      
Income tax provision at statutory rate $ 55,116 $ 42,864 $ 40,142
Foreign tax provision 2,876 3,972 2,498
State income taxes, net of federal income tax benefit 1,737 7,284 1,606
R&D (213) (156) (320)
Compensation limitations 1,563 735 562
Valuation allowance 0 (5,441) 2,205
Uncertain tax positions (369) (7,218) 0
Other (3,633) (2,609) 2,177
Total provision for income taxes $ 57,077 $ 39,431 $ 48,870
Income tax provision at statutory rate 21.00% 21.00% 21.00%
Foreign tax provision 1.10% 1.90% 1.30%
State income taxes, net of federal income tax benefit 0.70% 3.60% 0.80%
R&D (0.10%) (0.10%) (0.20%)
Compensation limitations 0.60% 0.40% 0.30%
Valuation allowance 0.00% (2.70%) 1.20%
Uncertain tax positions (0.001) (0.035) 0
Other (1.50%) (1.30%) 1.20%
Total provision for income taxes 21.70% 19.30% 25.60%