Stock Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock compensation expense before taxes	$ 28,301	$ 25,571	$ 79,697	$ 72,043
Income tax benefit	(8,086)	(6,781)	(22,769)	(19,106)
Stock compensation expense after taxes	20,215	18,790	56,928	52,937
Cost of products
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock compensation expense before taxes	3,358	2,912	9,170	8,116
Cost of maintenance and service
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock compensation expense before taxes	1,073	650	2,881	1,792
Research and development expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock compensation expense before taxes	13,617	13,046	39,069	36,469
Sales and marketing expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock compensation expense before taxes	5,494	5,139	15,430	14,581
General and administrative expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock compensation expense before taxes	$ 4,759	$ 3,824	$ 13,147	$ 11,085