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Equity Compensation Plans (Tables) | 6 Months Ended
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Nov. 30, 2018
Stock Option Activity | A summary of stock option activity during the six months ended November 30, 2018 follows:
|  | Shares |  |  | Weighted- Average Exercise Price |
Options outstanding June 1, 2018 |  |  | 2,497,124 |  |  | $ | 42.63 |
Granted |  |  | 525,750 |  |  |  | 62.93 |
Exercised |  |  | (340,023 | ) |  |  | 29.49 |
Forfeited |  |  | (91,620 | ) |  |  | 45.87 |
Options outstanding November 30, 2018 |  |  | 2,591,231 |  |  |  | 48.40 |
Fair Value of Stock Options Granted, Estimated using Weighted-Average Assumptions | The fair value of stock options granted was estimated using the following weighted-average assumptions.
|  | FY 2019 |  |  | FY 2018 |
Risk-free interest rate |  |  | 2.6 | % |  |  | 1.6 | %
Expected dividend yield |  |  | 0.0 | % |  |  | 0.0 | %
Expected stock price volatility |  |  | 27.0 | % |  |  | 27.2 | %
Expected option life |  |  | 3.5 years |  |  |  | 4.0 years |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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