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Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Aug. 31, 2015 | Aug. 31, 2014
Class A Convertible Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock, no par value | $ 0 |
Common stock, shares authorized | 400,000,000 |
Common stock, conversion basis | Each share of Class A Common Stock is convertible into one share of Class B Common Stock. |
Class B Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock, no par value | $ 0 |
Common stock, shares authorized | 2,400,000,000 |
Stock Incentive Plan 1990 | Class B Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares available for grant (in shares) | 359,000,000 |
Stock Incentive Plan 1990 | Employee Stock Option | Class B Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options vesting period (in years) | 4 years |
Stock options expiration from the date of grant (in years) | 10 years |
Accelerated stock option expense | $ 6 | $ 4
Unrecognized compensation costs from stock options, net of estimated forfeitures | $ 377 |
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 8 months 12 days |
Weighted average fair value per share of the options granted (in dollars per share) | $ 25.32 | $ 16.91
Minimum term of market traded options for estimates of expected volatility (in years) | 1 year |
Employee Stock Purchase Plans | Employee Stock | Class B Common Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Employee stock purchase plans, payroll deductions (percent) | 10.00% |
Employee stock purchase plan offering period (in months) | 6 months |
Shares purchased, price as percentage of lower of the fair market value (percent) | 85.00% |

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- Definition The maximum payroll deduction for employees for the purchase of stock under the Employee Stock Purchase Plan. + References No definition available. + Details
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- Definition The number of years from the date of grant that stock option awards expire. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + 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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