Segments and Entity-Wide Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Oct. 31, 2017
Segment Reporting Information [Line Items]
Equipment, building, furniture and fixtures, net	$ 318,835		$ 308,465
Maintenance spares, net	43,700
Net revenue	646,135	$ 621,497
Networking Platforms
Segment Reporting Information [Line Items]
Other intangible assets, net	36,900
Net revenue	496,033	489,944
Software and Software-Related Services
Segment Reporting Information [Line Items]
Other intangible assets, net	59,600
Net revenue	53,487	39,380
UNITED STATES
Segment Reporting Information [Line Items]
Equipment, building, furniture and fixtures, net	86,836		$ 90,482
Net revenue	$ 383,400	$ 379,700