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Income Taxes - Reconciliation of effective income tax rate (Details)	12 Months Ended
	May 31, 2025	May 31, 2024	May 31, 2023
Income Taxes
Provision for income tax at the federal statutory rate	21.00%	21.00%	21.00%
FCPA settlement	26.70%
State income taxes, net of federal benefit	10.10%	5.00%	2.60%
Non-deductible compensation	7.10%	4.40%	2.80%
Tax benefit from stock-based compensation	(1.70%)	(5.10%)	(2.00%)
Pension settlement		(8.60%)
Other	4.70%	3.90%	1.50%
Effective income tax rate	67.90%	20.60%	25.90%

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- Definition

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 income tax settlements on Foreign Corrupt Practices Act (FCPA).

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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 pension settlement.

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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 nondeductible expenses.

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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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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