Common Stock and Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended
Aug. 31, 2016 USD ($) $ / shares shares	Aug. 31, 2015 USD ($) $ / 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 \| 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 \| shares	2,400,000,000
Stock Incentive Plan \| Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares) \| shares	718,000,000
Stock Incentive Plan \| 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
Accelerated stock option expense \| $	$ 5	$ 6
Unrecognized compensation costs from stock options, net of estimated forfeitures \| $	$ 306
Unrecognized compensation costs from stock options, net of estimated forfeitures, to be recognized as operating overhead expense over a weighted average period	2 years 7 months 6 days
Weighted average fair value per share of the options granted (in dollars per share) \| $ / shares	$ 9.36	$ 12.66
Minimum term of market traded options for estimates of expected volatility	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	6 months
Shares purchased, price as percentage of lower of the fair market value (percent)	85.00%

Common Stock, Class A Conversion Ratio to Class B

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The percentage of the fair market value that shares are purchased by participants participating in the Employee Stock Purchase Plan. The percentage is applied to the lower of the fair market value at the beginning or the end of the offering period.

+ References

No definition available.

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- Definition

Employee Stock Purchase Plan Offering Period

+ References

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- Definition

Minimum Term of Market Traded Options For Estimates of Expected Volatility

+ References

No definition available.

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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.

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- Definition

The number of years from the date of grant that stock option awards expire.

+ References

No definition available.

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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

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- Definition

Face amount per share of no-par value common stock.

+ 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

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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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

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

+ References

No definition available.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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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

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