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Provision for Taxes (Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
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	2.47%	4.78%	3.56%
Foreign rate differential	0.24%	0.03%	0.08%
Federal tax credits	0.80%	0.58%	0.48%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	0.06%	0.04%	0.08%
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent	0.01%	0.01%	0.01%
Other	0.28%	0.01%	0.15%
Actual tax expense of operations	23.12%	25.17%	24.22%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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