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Earnings per Share (Details) (USD $) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2010 | Jul. 31, 2011 | Aug. 31, 2011 | Aug. 31, 2010 | Jul. 29, 2011
Basic Earnings per Share |  |  |  |  |
Net income |  |  | $ 68,638,000 | $ 61,277,000 |
Less: net income allocated to participating unvested securities |  |  | 370,000 | 227,000 |
Net income available to common shareholders |  |  | 68,268,000 | 61,050,000 |
Basic weighted average common shares outstanding (in shares) |  |  | 131,309,000 | 152,164,000 |
Basic earnings per share (in dollars per share) |  |  | $ 0.52 | $ 0.40 |
Diluted Earnings per Share |  |  |  |  |
Net income |  |  | 68,638,000 | 61,277,000 |
Less: net income allocated to participating unvested securities |  |  | 370,000 | 227,000 |
Net income available to common shareholders |  |  | 68,268,000 | 61,050,000 |
Basic weighted average common shares outstanding (in shares) |  |  | 131,309,000 | 152,164,000 |
Effect of dilutive securities - employee stock options (in shares) |  |  | 29,000 |  |
Diluted weighted average common shares outstanding (in shares) |  |  | 131,338,000 | 152,164,000 |
Diluted earnings per share (in dollars per share) |  |  | $ 0.52 | $ 0.40 |
Options granted excluded from the computation of diluted earnings per share (in shares) |  |  | 2,500,000 | 5,000,000 |
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 |  |  | $ 500,000,000
Average price of common stock purchased under a share buyback program (in dollars per share) |  |  |  |  | $ 31.70

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