|
Stockholders' Equity (Details Textual) (USD $)
|
1 Months Ended | 5 Months Ended | 6 Months Ended | 11 Months Ended | 17 Months Ended | |
|---|---|---|---|---|---|---|
|
Apr. 30, 2012
Class A and Class B [Member]
|
Apr. 30, 2011
Class A and Class B [Member]
|
Aug. 31, 2012
Class A Common Stock [Member]
|
Aug. 31, 2012
Class A Common Stock [Member]
|
Feb. 29, 2012
Class A Common Stock [Member]
|
Aug. 31, 2012
Class A Common Stock [Member]
|
|
| Class of Stock [Line Items] | ||||||
| Maximum authorized repurchase of common stock | $ 1,000,000,000.0 | $ 500,000,000 | ||||
| Common stock repurchased, shares | 14,023,985 | 3,970,481 | 21,234,266 | 25,204,747 | ||
| Common stock repurchased | $ 296,700,000 | $ 86,300,000 | $ 413,700,000 | $ 500,000,000 | ||
| Average cost of common stock repurchased | $ 21.15 | $ 21.74 | $ 19.48 | $ 19.84 | ||
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The amount authorized by an entity's Board of Directors under a stock repurchase plan. No definition available.
|
| X | ||||||||||
|
- Definition
Total cost of shares repurchased divided by the total number of shares repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|