Provision for Taxes (Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax rate	21.00%	21.00%	21.00%
Increase (Reduction) in Rate Resulting from [Abstract]
State taxes, net of federal benefit	4.78%	3.56%	3.24%
Foreign rate differential	0.03%	0.08%	0.05%
Federal tax credits	0.58%	0.48%	0.19%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	0.04%	0.08%	0.03%
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent	0.01%	0.01%	0.00%
Other	0.01%	0.15%	0.22%
Actual tax expense of operations	25.17%	24.22%	23.85%