REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 29, 2022	Jan. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 844,443	$ 757,130
Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	673,593	599,723
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	170,850	157,407
Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	540,936	512,324
Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	85,710	64,307
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	72,917	49,839
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	21,110	16,934
Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	72,491	67,630
Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	40,370	39,611
Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	10,909	6,485
Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	626,646	576,631
Networking Platforms | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	626,646	576,631
Networking Platforms | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	540,936	512,324
Networking Platforms | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	85,710	64,307
Networking Platforms | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	72,917	49,839
Platform Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	29,682	16,062
Platform Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	43,235	33,777
Platform Software and Services | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	72,917	49,839
Platform Software and Services | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	21,110	16,934
Blue Planet Automation Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	8,774	5,173
Blue Planet Automation Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	12,336	11,761
Blue Planet Automation Software and Services | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	21,110	16,934
Blue Planet Automation Software and Services | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services
Disaggregation of Revenue [Line Items]
Total revenue	123,770	113,726
Global Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	8,491	1,857
Global Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	115,279	111,869
Global Services | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	72,491	67,630
Global Services | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	40,370	39,611
Global Services | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	$ 10,909	$ 6,485