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Stock-Based Benefit Plans (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Stock-based compensation expense recognized and estimated amount to be recognized
Stock based expense recognized	$ 3,367	$ 2,430	$ 12,227	$ 10,147
Employee Stock Option [Member]
Stock-based compensation expense recognized and estimated amount to be recognized
Stock based expense recognized	$ 1,346	$ 1,402	$ 6,091	$ 7,307

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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