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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Aug. 06, 2012 | Feb. 07, 2012 | Dec. 15, 2011 | Aug. 05, 2011 | Feb. 07, 2011 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2012 | Oct. 31, 2011 | Oct. 31, 2010 | Dec. 05, 2012 Subsequent Event [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, maximum amount authorized |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  | $ 300,000,000
Number of shares purchased |  |  |  |  |  | 0 | 321,000 | 0 | 663,000 | 984,027 | 0 |  |
Cost of common stock repurchased |  |  |  |  |  |  | 25,000,000 |  | 46,100,000 | 71,150,000 |  |  |
Share repurchase program, remaining authorized amount |  |  |  |  |  |  |  |  |  | 78,900,000 |  |  | 228,900,000
Average purchase price per share |  |  |  |  |  |  | $ 77.89 |  | $ 69.60 |  |  |  |
Dividends on common stock | 1,400,000 | 1,400,000 |  | 1,400,000 | 1,400,000 |  |  |  |  | 2,857,000 | 2,816,000 | 2,732,000 |
Cash dividend, per share | $ 0.03 | $ 0.03 |  | $ 0.03 | $ 0.03 |  |  |  |  | $ 0.03 |  |  |
Date of record | Jul. 24, 2012 | Jan. 25, 2012 |  | Jul. 25, 2011 | Jan. 19, 2011 |  |  |  |  |  |  |  |
Common stock purchase right versus preferred share purchase right |  |  |  |  |  |  |  |  |  | 0.5 |  |  |
Percentage of acquisition of beneficial ownership |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Purchase price of the Right, subject to adjustment |  |  |  |  |  |  |  |  |  | $ 450 |  |  |
Percentage of assets or earning power sold |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Board of Directors may redeem the rights at, price per right |  |  |  |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  |

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