Common Stock and Stock-Based Compensation - Weighted Average Assumptions Used to Estimate Fair Values (Detail) - Stock options	12 Months Ended
May 31, 2022	May 31, 2021	May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.80%	0.90%	1.00%
Expected volatility	24.90%	27.30%	23.00%
Weighted average expected life (in years)	5 years 9 months 18 days	6 years	6 years
Risk-free interest rate	0.90%	0.40%	1.50%

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 718
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