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v3.10.0.1

Stock-Based Compensation - Stock Options Granted and Outstanding (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016 | May 31, 2015
Shares |  |  |  |
Outstanding, beginning of period (shares) | 8,588,050 | 8,419,907 | 7,835,570 |
Granted (shares) | 1,664,867 | 1,343,180 | 1,739,767 |
Canceled (shares) | (7,809) | (5,368) | (4,413) |
Forfeited (shares) | (255,627) | (165,452) | (231,042) |
Exercised (shares) | (1,059,295) | (1,004,217) | (919,975) |
Outstanding, end of period (shares) | 8,930,186 | 8,588,050 | 8,419,907 |
Weighted Average Exercise Price |  |  |  |
Outstanding, beginning of period, Weighted Average Exercise Price (dollars per share) | $ 74.77 | $ 61.83 | $ 51.59 |
Granted, Weighted Average Exercise Price (dollars per share) | 175.86 | 126.51 | 93.55 |
Canceled, Weighted Average Exercise Price (dollars per share) | 45.10 | 32.45 | 34.56 |
Forfeited, Weighed Average Exercise Price (dollars per share) | 94.73 | 73.43 | 60.57 |
Exercised, Weighted Average Exercise Price (dollars per share) | 44.06 | 35.95 | 35.07 |
Outstanding, end of period, Weighted Average Exercise Price (dollars per share) | $ 96.71 | $ 74.77 | $ 61.83 |
Number of exercisable options (shares) | 2,006,922 | 1,795,898 | 1,649,236 | 1,426,550

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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 (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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