Stockholders' Equity (Details) (USD $)
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0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended | |||||||||
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Aug. 06, 2012
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Feb. 07, 2012
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Dec. 15, 2011
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Aug. 05, 2011
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Feb. 07, 2011
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Oct. 31, 2012
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Jul. 31, 2012
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Apr. 30, 2012
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Jan. 31, 2012
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Oct. 31, 2012
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Oct. 31, 2011
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Oct. 31, 2010
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Dec. 05, 2012
Subsequent Event [Member]
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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 |