Share Based Compensation Expense (Details 5) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2011	Jul. 31, 2010
Share-based compensation expense
Share-based compensation expense capitalized in inventory, net	$ (152)	$ 111	$ (28)	$ 110
Total share-based compensation	9,033	9,651	27,919	26,451
Product costs [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	578	548	1,658	1,475
Service costs [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	510	432	1,516	1,315
Cost of Sales [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	1,088	980	3,174	2,790
Research and Development Expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	2,423	2,302	7,591	6,948
Selling and marketing expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	2,737	2,902	8,871	8,025
General and Administrative Expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	2,883	2,473	8,023	7,349
Acquisition and Integration Costs [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	54	883	288	1,229
Operating Expense [Member]
Share-based compensation expense
Allocated Share-based Compensation Expense	$ 8,097	$ 8,560	$ 24,773	$ 23,551