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Stock-Based Benefit Plans (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Stock-based compensation expense recognized and estimated amount to be recognized
Stock based expense recognized	$ 3,205	$ 2,345	$ 8,831	$ 7,717
Employee Stock Option [Member]
Stock-based compensation expense recognized and estimated amount to be recognized
Stock based expense recognized	$ 1,225	$ 1,317	$ 4,745	$ 5,905

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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