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Income Taxes (Reconciliation of U.S. Federal Statutory Tax Rate) (Details)	12 Months Ended
	May 31, 2025	May 31, 2024	May 31, 2023
Income Tax Disclosure [Abstract]
Federal statutory tax rate	21.00%	21.00%	21.00%
Increase/(decrease) resulting from:
State income taxes, net of federal tax benefit	4.20%	4.00%	4.20%
Stock option windfall benefit	(0.40%)	(0.40%)	(0.40%)
Tax credits	(1.10%)	(0.80%)	(0.70%)
Other items	0.10%		(0.10%)
Effective income tax rate	23.80%	23.80%	24.00%

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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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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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