Share-Based Compensation Expense (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Apr. 30, 2012 Restricted Stock Units (RSUs) [Member]	Oct. 31, 2011 Restricted Stock Units (RSUs) [Member]	Apr. 30, 2012 Product costs [Member]	Apr. 30, 2011 Product costs [Member]	Apr. 30, 2012 Product costs [Member]	Apr. 30, 2011 Product costs [Member]	Apr. 30, 2012 Service costs [Member]	Apr. 30, 2011 Service costs [Member]	Apr. 30, 2012 Service costs [Member]	Apr. 30, 2011 Service costs [Member]	Apr. 30, 2012 Cost of Sales [Member]	Apr. 30, 2011 Cost of Sales [Member]	Apr. 30, 2012 Cost of Sales [Member]	Apr. 30, 2011 Cost of Sales [Member]	Apr. 30, 2012 Research and Development Expense [Member]	Apr. 30, 2011 Research and Development Expense [Member]	Apr. 30, 2012 Research and Development Expense [Member]	Apr. 30, 2011 Research and Development Expense [Member]	Apr. 30, 2012 Selling and marketing expense [Member]	Apr. 30, 2011 Selling and marketing expense [Member]	Apr. 30, 2012 Selling and marketing expense [Member]	Apr. 30, 2011 Selling and marketing expense [Member]	Apr. 30, 2012 General and Administrative Expense [Member]	Apr. 30, 2011 General and Administrative Expense [Member]	Apr. 30, 2012 General and Administrative Expense [Member]	Apr. 30, 2011 General and Administrative Expense [Member]	Apr. 30, 2012 Acquisition and Integration Costs [Member]	Apr. 30, 2011 Acquisition and Integration Costs [Member]	Apr. 30, 2012 Acquisition and Integration Costs [Member]	Apr. 30, 2011 Acquisition and Integration Costs [Member]	Apr. 30, 2012 Operating Expense [Member]	Apr. 30, 2011 Operating Expense [Member]	Apr. 30, 2012 Operating Expense [Member]	Apr. 30, 2011 Operating Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense			$ 460	$ 505	$ 944	$ 1,079	$ 367	$ 502	$ 805	$ 1,005	$ 827	$ 1,007	$ 1,749	$ 2,084	$ 2,092	$ 2,597	$ 4,226	$ 5,168	$ 2,820	$ 3,143	$ 5,921	$ 6,134	$ 2,141	$ 2,140	$ 4,938	$ 5,141	$ 0	$ 74	$ 6	$ 234	$ 7,053	$ 7,954	$ 15,091	$ 16,677
Summary of Restricted Stock Unit Activity
Balance at October 31,2011	4,298
Granted	2,180
Vested	(1,117)
Canceled or forfeited	(228)
Balance at April 30, 2012	5,133
Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 20.15	$ 16.28
Aggregate Fair Value	$ 77,456	$ 59,399