Stockholders' Equity (Details)	12 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	2,527,458	6,119,923	8,234,324
Class A Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, Common Stock, end of period	250,839,359	248,264,944
Balance, Treasury Stock, end of period	79,681,859	80,225,575
Class B Convertible Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, Common Stock, end of period	28,389,608	28,436,565
Balance, Treasury Stock, end of period	5,005,800	5,005,800
Class 1 Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, Common Stock, end of period	0	0
Common Stock [Member] \| Class A Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, Common Stock, beginning of period	248,264,944	242,064,514	233,751,797
Share repurchases			0
Conversion of shares	46,957	80,507	78,496
Exercise of stock options	2,527,458	6,119,923	8,234,221
Employee stock purchases	0	0	0
Grant of restricted stock awards	0	0	0
Cancellation of restricted shares	0	0	0
Balance, Common Stock, end of period	250,839,359	248,264,944	242,064,514
Common Stock [Member] \| Class A Common Stock [Member] \| Restricted stock units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of stock units	0	0	0
Common Stock [Member] \| Class A Common Stock [Member] \| Performance share units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of stock units	0	0
Common Stock [Member] \| Class B Convertible Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, Common Stock, beginning of period	28,436,565	28,517,035	28,583,916
Share repurchases			0
Conversion of shares	(46,957)	(80,470)	(66,881)
Exercise of stock options	0	0	0
Employee stock purchases	0	0	0
Grant of restricted stock awards	0	0	0
Cancellation of restricted shares	0	0	0
Balance, Common Stock, end of period	28,389,608	28,436,565	28,517,035
Common Stock [Member] \| Class B Convertible Common Stock [Member] \| Restricted stock units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of stock units	0	0	0
Common Stock [Member] \| Class B Convertible Common Stock [Member] \| Performance share units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of stock units	0	0
Common Stock [Member] \| Class 1 Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, Common Stock, beginning of period	0	37	11,549
Share repurchases			0
Conversion of shares	0	(37)	(11,615)
Exercise of stock options	0	0	103
Employee stock purchases	0	0	0
Grant of restricted stock awards	0	0	0
Cancellation of restricted shares	0	0	0
Balance, Common Stock, end of period	0	0	37
Common Stock [Member] \| Class 1 Common Stock [Member] \| Restricted stock units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of stock units	0	0	0
Common Stock [Member] \| Class 1 Common Stock [Member] \| Performance share units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of stock units	0	0
Treasury Stock [Member] \| Class A Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, Treasury Stock, beginning of period	80,225,575	80,799,298	63,015,441
Share repurchases			17,994,466
Conversion of shares	0	0	0
Exercise of stock options	0	0	0
Employee stock purchases	(117,301)	(163,817)	(210,895)
Grant of restricted stock awards	(6,424)	(12,375)	(18,190)
Cancellation of restricted shares	8,426	33,661	61,140
Balance, Treasury Stock, end of period	79,681,859	80,225,575	80,799,298
Treasury Stock [Member] \| Class A Common Stock [Member] \| Restricted stock units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of stock units	(140,396)	(121,539)	(42,664)
Shares withheld to satisfy tax withholding requirements	101,499	96,767	23,836
Treasury Stock [Member] \| Class A Common Stock [Member] \| Performance share units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of stock units	(288,021)	(309,653)
Shares withheld to satisfy tax withholding requirements	248,499	267,577
Treasury Stock [Member] \| Class B Convertible Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, Treasury Stock, beginning of period	5,005,800	5,005,800	5,005,800
Share repurchases			0
Conversion of shares	0	0	0
Exercise of stock options	0	0	0
Employee stock purchases	0	0	0
Grant of restricted stock awards	0	0	0
Cancellation of restricted shares	0	0	0
Balance, Treasury Stock, end of period	5,005,800	5,005,800	5,005,800
Treasury Stock [Member] \| Class B Convertible Common Stock [Member] \| Restricted stock units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of stock units	0	0	0
Treasury Stock [Member] \| Class B Convertible Common Stock [Member] \| Performance share units [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of stock units	0	0

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

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The number of restricted shares issued as compensation, net of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

+ References

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

No definition available.

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- Definition

Number of shares issued during the period as a result of the conversion of convertible securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Number of shares that have been repurchased during the period and are being held in treasury.

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