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Common Stock and Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions | 9 Months Ended
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Feb. 28, 2017 USD ($) $ / shares shares | Feb. 29, 2016 $ / shares
Class A Convertible Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock, no par value (in dollars per share) | $ / shares | $ 0 |
Common stock, shares authorized (in shares) | shares | 400,000,000 |
Common stock, conversion basis | 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 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock, no par value (in dollars per share) | $ / shares | $ 0 |
Common stock, shares authorized (in shares) | shares | 2,400,000,000 |
Shares available for grant (in shares) | shares | 718,000,000 |
Employee Stock Option | Class B Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options vesting period | 4 years |
Stock options expiration from the date of grant | 10 years |
Unrecognized compensation costs from stock options, net of estimated forfeitures | $ | $ 236 |
Unrecognized compensation costs from stock options, net of estimated forfeitures, to be recognized as operating overhead expense over a weighted average period | 2 years 2 months 12 days |
Weighted average fair value per share of the options granted (in dollars per share) | $ / shares | $ 9.38 | $ 12.67
Minimum term of market traded options for estimates of expected volatility | 1 year |
ESPPs | Class B Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employee stock purchase plans, payroll deductions | 10.00% |
Employee stock purchase plan offering period | 6 months |

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- Definition Minimum Term of Market Traded Options For Estimates of Expected Volatility + References No definition available. + Details
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- Definition Describe the conversion features of common stock if such stock is convertible. That is, shares of common stock into which another convertible security was converted, or shares of common stock into which another class of common stock was converted. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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