Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 30, 2021	Feb. 01, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 757,130	$ 832,912
Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	599,723	680,104
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	157,407	152,808
Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	512,324	591,549
Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	64,307	67,508
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	49,839	51,888
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	16,934	15,466
Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	67,630	61,793
Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	39,611	34,954
Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	6,485	9,754
Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	576,631	659,057
Networking Platforms | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	576,631	659,057
Networking Platforms | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	576,631	659,057
Networking Platforms | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	512,324	591,549
Networking Platforms | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	64,307	67,508
Networking Platforms | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Networking Platforms | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	49,839	51,888
Platform Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	16,062	13,114
Platform Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	33,777	38,774
Platform Software and Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	49,839	51,888
Platform Software and Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	49,839	51,888
Platform Software and Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Operating Segments | 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	16,934	15,466
Blue Planet Automation Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	5,173	3,736
Blue Planet Automation Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	11,761	11,730
Blue Planet Automation Software and Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	16,934	15,466
Blue Planet Automation Software and Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	16,934	15,466
Blue Planet Automation Software and Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Blue Planet Automation Software and Services | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services
Disaggregation of Revenue [Line Items]
Total revenue	113,726	106,501
Global Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	1,857	4,197
Global Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	111,869	102,304
Global Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	113,726	106,501
Global Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	67,630	61,793
Global Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	39,611	34,954
Global Services | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	$ 6,485	$ 9,754