Share-Based Compensation Expense (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Share-based compensation expense
Share-based compensation expense capitalized in inventory, net	$ 62	$ 60	$ (10)	$ 125
Total share-based compensation	7,942	9,021	16,830	18,886
Cost of Sales [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	827	1,007	1,749	2,084
Product costs [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	460	505	944	1,079
Service costs [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	367	502	805	1,005
Operating Expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	7,053	7,954	15,091	16,677
Research and Development Expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	2,092	2,597	4,226	5,168
Selling and marketing expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	2,820	3,143	5,921	6,134
General and Administrative Expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	2,141	2,140	4,938	5,141
Acquisition and Integration Costs [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	$ 0	$ 74	$ 6	$ 234