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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, 2019 USD ($) $ / shares shares | May 31, 2018 USD ($) $ / shares shares | May 31, 2017 USD ($) $ / shares shares
Class A Convertible Common Stock |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Common stock, no par value | $ / 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 | $ / 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) | 5 years 10 months 24 days |  |
Weighted average remaining contractual life for options exercisable (in years) | 4 years 3 months 18 days |  |
Aggregate intrinsic value for options outstanding | $ | $ 2,507 |  |
Aggregate intrinsic value for options exercisable | $ | 2,138 |  |
Total intrinsic value of options exercised | $ | 938 | $ 889 | $ 594
Stock options | Stock Incentive Plan |  |  |
Common Stock and Share Based Compensation [Line Items] |  |  |
Unrecognized compensation costs from stock options, net of estimated forfeitures | $ | $ 352 |  |
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 1 month 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 | $ 22.78 | $ 9.82 | $ 9.38
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 | 2,500,000 | 3,100,000 | 3,100,000

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- Definition Description of basis for conversion of convertible common stock. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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