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Description of the Business, Basis of Presentation and Summary of Significant Accounting Policies - Stock-based Compensation (Details) - $ / shares	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Estimated fair value of stock options granted (in Dollars)	$ 3.80	$ 6.99	$ 11.97
Assumptions:
Expected dividend yield (percent)	2.90%	1.90%	1.40%
Expected stock price volatility (percent)	30.20%	27.40%	28.40%
Risk-free interest rate (percent)	0.20%	1.30%	3.00%
Expected life of options (in years)	4 years	5 years	6 years

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The estimated fair value of stock options granted.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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-Publisher FASB
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-Topic 718
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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.

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