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Income Taxes (Schedule Of Differences Between Statutory Tax Rate And Effective Tax Rate) (Details)
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Income Tax Disclosure [Abstract]      
Statutory federal tax expense (benefit) rate 21.00% 21.00% 21.00%
State taxes, net of federal benefit 1.10% 1.90% 1.70%
Differences between statutory rate and foreign effective tax rate 7.60% 6.80% 7.00%
Effective Income Tax Rate Reconciliation, Excess Tax Benefit From Equity Compensation, Percent (0.30%) (1.20%) (2.70%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent 0.00% (5.90%) 0.00%
Research and development credits (3.00%) (2.80%) (2.40%)
Unremitted earnings of foreign subsidiaries 8.90% 2.70% (10.10%)
Non-deductible stock-based compensation 3.20% 3.80% 3.30%
Other 1.00% 0.70% (0.10%)
Effective tax expense (benefit) rate 39.50% 27.00% 17.70%