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Common Stock and Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions | 12 Months Ended
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May 31, 2020 USD ($) $ / shares shares | May 31, 2019 USD ($) $ / shares shares | May 31, 2018 USD ($) $ / shares shares
Class A Convertible Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Common stock, no par value (in dollars per share) | $ / shares | $ 0 |  |
Common stock, number of shares authorized (in shares) | shares | 400,000,000 |  |
Common stock conversion | Each share of Class A Common Stock is convertible into one share of Class B Common Stock. |  |
Common stock, Class A conversion ratio to Class B (in shares) | 1 |  |
Class B Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Common stock, no par value (in dollars per share) | $ / shares | $ 0 |  |
Common stock, number of shares authorized (in shares) | shares | 2,400,000,000 |  |
Stock Incentive Plan |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Stock options vesting period (in years) | 4 years |  |
Stock options expiration from the date of grant (in years) | 10 years |  |
Stock Incentive Plan | Class B Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Shares available for grant (in shares) | shares | 718,000,000 |  |
Minimum term of market traded options for estimates of expected volatility (in years) | 1 year |  |
Weighted average remaining contractual life for options outstanding (in years) | 6 years 2 months 12 days |  |
Weighted average remaining contractual life for options exercisable (in years) | 4 years 6 months |  |
Aggregate intrinsic value for options outstanding | $ | $ 3,316 |  |
Aggregate intrinsic value for options exercisable | $ | 2,506 |  |
Total intrinsic value of options exercised | $ | 1,161 | $ 938 | $ 889
Stock options | Stock Incentive Plan |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Unrecognized compensation costs from stock options, net of estimated forfeitures | $ | $ 411 |  |
Unrecognized compensation costs from stock options, net of estimated forfeitures, to be recognized as operating overhead expense over a weighted average period (in years) | 2 years 7 months 6 days |  |
Stock options | Stock Incentive Plan | Class B Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Weighted average fair value per share of the options granted (in dollars per share) | $ / shares | $ 18.71 | $ 22.78 | $ 9.82
Employee Stock | Class B Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Employee stock purchase plans, payroll deductions | 10.00% |  |
Employee stock purchase plan offering period |  | 6 months |
Shares purchased, price as percentage of lower of the fair market value | 85.00% |  |
Purchase of shares by employee (in shares) | shares | 2,700,000 | 2,500,000 | 3,100,000

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- Definition Number of shares authorized for issuance under share-based payment arrangement. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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