Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021	May 02, 2020
Disaggregation of Revenue [Line Items]
Total revenue	$ 833,927	$ 894,053	$ 1,591,057	$ 1,726,965
Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	670,226	744,861	1,269,950	1,424,966
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	163,701	149,192	321,107	301,999
Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	573,657	654,294	1,085,981	1,245,844
Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	63,628	64,167	127,934	131,675
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	56,688	44,985	106,527	96,873
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	23,958	15,017	40,892	30,482
Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	70,418	71,479	138,049	133,271
Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	37,999	34,242	77,610	69,196
Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	7,579	9,869	14,064	19,624
Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	637,285	718,461	1,213,915	1,377,519
Networking Platforms | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	637,285	718,461	1,213,915	1,377,519
Networking Platforms | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	637,285	718,461	1,213,915	1,377,519
Networking Platforms | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	573,657	654,294	1,085,981	1,245,844
Networking Platforms | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	63,628	64,167	127,934	131,675
Networking Platforms | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Networking Platforms | Operating Segments | 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	56,688	44,985	106,527	96,873
Platform Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	20,765	16,978	36,828	30,092
Platform Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	35,923	28,007	69,699	66,781
Platform Software and Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	56,688	44,985	106,527	96,873
Platform Software and Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	56,688	44,985	106,527	96,873
Platform Software and Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Platform Software and Services | Operating Segments | 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	23,958	15,017	40,892	30,482
Blue Planet Automation Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	10,765	4,745	15,939	8,481
Blue Planet Automation Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	13,193	10,272	24,953	22,001
Blue Planet Automation Software and Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	23,958	15,017	40,892	30,482
Blue Planet Automation Software and Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	23,958	15,017	40,892	30,482
Blue Planet Automation Software and Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Blue Planet Automation Software and Services | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services
Disaggregation of Revenue [Line Items]
Total revenue	115,996	115,590	229,723	222,091
Global Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	1,411	4,677	3,268	8,874
Global Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	114,585	110,913	226,455	213,217
Global Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	115,996	115,590	229,723	222,091
Global Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Operating Segments | Routing and Switching
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Operating Segments | Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Operating Segments | Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0	0
Global Services | Operating Segments | Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	70,418	71,479	138,049	133,271
Global Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	37,999	34,242	77,610	69,196
Global Services | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	$ 7,579	$ 9,869	$ 14,064	$ 19,624