Share-Based Compensation Expense (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Share-based compensation expense
Share-based compensation expense capitalized in inventory, net	$ (72)	$ 64
Total share-based compensation	8,888	9,864
Cost of Sales [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	922	1,077
Product costs [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	485	574
Service costs [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	437	503
Operating Expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	8,038	8,723
Research and Development Expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	2,134	2,571
Selling and marketing expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	3,101	2,991
General and Administrative Expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	2,797	3,001
Acquisition and Integration Costs [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	$ 6	$ 160