REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 949,227	$ 833,927	$ 1,793,670	$ 1,591,057
Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	773,728	670,226	1,447,320	1,269,950
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	175,499	163,701	346,350	321,107
Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	625,294	573,657	1,166,230	1,085,981
Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	109,186	63,628	194,896	127,934
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	69,157	56,688	142,074	106,527
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	16,881	23,958	37,992	40,892
Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	74,019	70,418	146,509	138,049
Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	41,430	37,999	81,800	77,610
Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	13,260	7,579	24,169	14,064
Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	734,480	637,285	1,361,126	1,213,915
Networking Platforms | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	734,480	637,285	1,361,126	1,213,915
Networking Platforms | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	625,294	573,657	1,166,230	1,085,981
Networking Platforms | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	109,186	63,628	194,896	127,934
Networking Platforms | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	69,157	56,688	142,074	106,527
Platform Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	21,743	20,765	51,424	36,828
Platform Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	47,414	35,923	90,650	69,699
Platform Software and Services | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	69,157	56,688	142,074	106,527
Platform Software and Services | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	16,881	23,958	37,992	40,892
Blue Planet Automation Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	4,036	10,765	12,810	15,939
Blue Planet Automation Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	12,845	13,193	25,182	24,953
Blue Planet Automation Software and Services | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	16,881	23,958	37,992	40,892
Blue Planet Automation Software and Services | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services
Disaggregation of Revenue [Line Items]
Total revenue	128,709	115,996	252,478	229,723
Global Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	13,469	1,411	21,960	3,268
Global Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	115,240	114,585	230,518	226,455
Global Services | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	74,019	70,418	146,509	138,049
Global Services | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	41,430	37,999	81,800	77,610
Global Services | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	$ 13,260	$ 7,579	$ 24,169	$ 14,064