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Stockholders' Equity (Details Textual) (USD $)
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12 Months Ended | 12 Months Ended | 11 Months Ended | 12 Months Ended | 23 Months Ended | 12 Months Ended | 1 Months Ended | |||||||
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Feb. 28, 2013
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Feb. 29, 2012
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Feb. 28, 2014
class_of_stock
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Feb. 28, 2014
Class B Convertible Common Stock [Member]
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Feb. 28, 2013
Class B Convertible Common Stock [Member]
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Feb. 28, 2013
Class A Common Stock [Member]
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Feb. 29, 2012
Class A Common Stock [Member]
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Feb. 28, 2014
Class A Common Stock [Member]
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Feb. 28, 2013
Class A Common Stock [Member]
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Feb. 28, 2013
Class A Common Stock [Member]
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Feb. 28, 2014
Class 1 Common Stock [Member]
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Feb. 28, 2013
Class 1 Common Stock [Member]
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Apr. 30, 2012
Class A and Class B [Member]
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Apr. 30, 2011
Class A and Class B [Member]
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| Class of Stock [Line Items] | ||||||||||||||
| Number of classes of outstanding common stock | 2 | |||||||||||||
| Common stock, conversion features | convertible into shares of Class A Common Stock on a one-to-one basis | convertible into shares of Class A Common Stock on a one-to-one basis | ||||||||||||
| Common stock, voting rights | ten votes per share | one vote per share | generally have no voting rights | |||||||||||
| Common stock, dividend rights | 10.00% | |||||||||||||
| Common stock, shares authorized | 30,000,000 | 30,000,000 | 322,000,000 | 322,000,000 | 322,000,000 | 322,000,000 | 25,000,000 | 25,000,000 | ||||||
| Common and preferred stock, shares authorized | 378,000,000 | |||||||||||||
| Common stock, shares outstanding | 23,430,765 | 168,039,369 | 0 | |||||||||||
| Maximum authorized repurchase of common stock | $ 1,000,000,000.0 | $ 500,000,000 | ||||||||||||
| Common stock repurchased, shares | 17,994,466 | 21,234,266 | 14,023,985 | 21,234,266 | 3,970,481 | 25,204,747 | ||||||||
| Common stock repurchased | $ 383,000,000 | $ 413,700,000 | $ 296,700,000 | $ 413,700,000 | $ 86,300,000 | $ 500,000,000 | ||||||||
| Average cost of common stock repurchased | $ 21.15 | $ 19.48 | $ 21.74 | $ 19.84 | ||||||||||
| X | ||||||||||
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- Definition
Common and Preferred Stock, Shares Authorized No definition available.
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| X | ||||||||||
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- Definition
Common stock, dividend rights No definition available.
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| X | ||||||||||
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- Definition
Number of classes of common stock with material number of shares outstanding. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Basis of conversion of convertible common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of a stock repurchase plan authorized by an entity's Board of Directors. No definition available.
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| X | ||||||||||
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- Definition
Total cost of shares repurchased divided by the total number of shares repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of shares that have been repurchased during the period and are being held in treasury. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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