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Earnings per Share (Details) (USD $) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 10 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2010 | Jul. 31, 2011 | Nov. 30, 2011 | Nov. 30, 2010 | Nov. 30, 2011 | Nov. 30, 2010 | Jul. 29, 2011 | Oct. 18, 2011
Basic Earnings per Share |  |  |  |  |  |  |  |
Net income |  |  | $ 74,350,000 | $ 55,866,000 | $ 142,988,000 | $ 117,143,000 |  |
Less dividends to: |  |  |  |  |  |  |  |
Total dividends |  |  | 70,820,000 | 71,880,000 | 70,820,000 | 71,880,000 |  |
Undistributed net income (loss) |  |  | 3,530,000 | (16,014,000) | 72,168,000 | 45,263,000 |  |
Less: net income (loss) allocated to participating unvested securities |  |  | 21,000 | (74,000) | 448,000 | 204,000 |  |
Net income (loss) available to common shareholders |  |  | 3,509,000 | (15,940,000) | 71,720,000 | 45,059,000 |  |
Basic weighted average common shares outstanding (in shares) |  |  | 129,727,000 | 145,511,000 | 130,522,000 | 148,856,000 |  |
Basic earnings per share: |  |  |  |  |  |  |  |
Total shares (in dollars per share) |  |  | $ 0.57 | $ 0.38 | $ 1.09 | $ 0.78 |  |
Diluted Earnings per Share |  |  |  |  |  |  |  |
Net income |  |  | 74,350,000 | 55,866,000 | 142,988,000 | 117,143,000 |  |
Less dividends to: |  |  |  |  |  |  |  |
Total dividends |  |  | 70,820,000 | 71,880,000 | 70,820,000 | 71,880,000 |  |
Undistributed net income (loss) |  |  | 3,530,000 | (16,014,000) | 72,168,000 | 45,263,000 |  |
Less: net income (loss) allocated to participating unvested securities |  |  | 21,000 | (74,000) | 448,000 | 204,000 |  |
Net income (loss) available to common shareholders |  |  | 3,509,000 | (15,940,000) | 71,720,000 | 45,059,000 |  |
Basic weighted average common shares outstanding (in shares) |  |  | 129,727,000 | 145,511,000 | 130,522,000 | 148,856,000 |  |
Effect of dilutive securities - employee stock options (in shares) |  |  | 13,000 |  | 21,000 |  |  |
Diluted weighted average common shares outstanding (in shares) |  |  | 129,740,000 | 145,511,000 | 130,543,000 | 148,856,000 |  |
Diluted earnings per share: |  |  |  |  |  |  |  |
Total shares (in dollars per share) |  |  | $ 0.57 | $ 0.38 | $ 1.09 | $ 0.78 |  |
Options granted excluded from the computation of diluted earnings per share (in shares) |  |  | 3,300,000 | 3,500,000 | 2,600,000 | 3,900,000 |  |
Additional amount authorized under share buyback program | 500,000,000 |  |  |  |  |  |  |
Common stock purchased under a share buyback program (in shares) |  | 8,100,000 |  |  |  |  | 15,800,000 |
Aggregate purchase price of common stock under a share buyback program |  | 259,500,000 |  |  |  |  |  |
Average price of common stock purchased under a share buyback program (in dollars per share) |  |  |  |  |  |  | $ 31.70 |
New amount authorized under share buyback program |  |  |  |  |  |  |  | 500,000,000
Common shares |  |  |  |  |  |  |  |
Less dividends to: |  |  |  |  |  |  |  |
Total dividends |  |  | 70,055,000 | 71,197,000 | 70,055,000 | 71,197,000 |  |
Basic earnings per share: |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  | $ 0.54 | $ 0.49 | $ 0.54 | $ 0.49 |  |
Undistributed earnings (in dollars per share) |  |  | $ 0.03 | $ (0.11) | $ 0.55 | $ 0.29 |  |
Total shares (in dollars per share) |  |  | $ 0.57 | $ 0.38 | $ 1.09 | $ 0.78 |  |
Less dividends to: |  |  |  |  |  |  |  |
Total dividends |  |  | 70,055,000 | 71,197,000 | 70,055,000 | 71,197,000 |  |
Diluted earnings per share: |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  | $ 0.54 | $ 0.49 | $ 0.54 | $ 0.49 |  |
Undistributed earnings (in dollars per share) |  |  | $ 0.03 | $ (0.11) | $ 0.55 | $ 0.29 |  |
Total shares (in dollars per share) |  |  | $ 0.57 | $ 0.38 | $ 1.09 | $ 0.78 |  |
Unvested shares |  |  |  |  |  |  |  |
Less dividends to: |  |  |  |  |  |  |  |
Total dividends |  |  | 765,000 | 683,000 | 765,000 | 683,000 |  |
Basic earnings per share: |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  | $ 0.54 | $ 0.49 | $ 0.54 | $ 0.49 |  |
Undistributed earnings (in dollars per share) |  |  | $ 0.03 | $ (0.11) | $ 0.55 | $ 0.29 |  |
Total shares (in dollars per share) |  |  | $ 0.57 | $ 0.38 | $ 1.09 | $ 0.78 |  |
Less dividends to: |  |  |  |  |  |  |  |
Total dividends |  |  | $ 765,000 | $ 683,000 | $ 765,000 | $ 683,000 |  |
Diluted earnings per share: |  |  |  |  |  |  |  |
Distributed earnings (in dollars per share) |  |  | $ 0.54 | $ 0.49 | $ 0.54 | $ 0.49 |  |
Undistributed earnings (in dollars per share) |  |  | $ 0.03 | $ (0.11) | $ 0.55 | $ 0.29 |  |
Total shares (in dollars per share) |  |  | $ 0.57 | $ 0.38 | $ 1.09 | $ 0.78 |  |

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