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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 832,912	$ 778,527
Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	680,104	646,404
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	152,808	132,123
Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	591,549	548,997
Packet Networking
Disaggregation of Revenue [Line Items]
Total revenue	67,508	71,569
Platform Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	51,888	41,598
Blue Planet Automation Software and Services
Disaggregation of Revenue [Line Items]
Total revenue	15,466	14,974
Maintenance Support and Training
Disaggregation of Revenue [Line Items]
Total revenue	61,793	61,277
Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	34,954	30,622
Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	9,754	9,490
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	832,912	778,527
Networking Platforms
Disaggregation of Revenue [Line Items]
Total revenue	659,057	620,566
Networking Platforms | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	659,057	620,566
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	659,057	620,566
Networking Platforms | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	591,549	548,997
Networking Platforms | Operating Segments | Packet Networking
Disaggregation of Revenue [Line Items]
Total revenue	67,508	71,569
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	51,888	41,598
Platform Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	13,114	16,044
Platform Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	38,774	25,554
Platform Software and Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	51,888	41,598
Platform Software and Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Platform Software and Services | Operating Segments | Packet Networking
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	51,888	41,598
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	15,466	14,974
Blue Planet Automation Software and Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	3,736	6,228
Blue Planet Automation Software and Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	11,730	8,746
Blue Planet Automation Software and Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	15,466	14,974
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 | Packet Networking
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	15,466	14,974
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	106,501	101,389
Global Services | Products and services at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	4,197	3,566
Global Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	102,304	97,823
Global Services | Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	106,501	101,389
Global Services | Operating Segments | Converged Packet Optical
Disaggregation of Revenue [Line Items]
Total revenue	0	0
Global Services | Operating Segments | Packet Networking
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	61,793	61,277
Global Services | Operating Segments | Installation and Deployment
Disaggregation of Revenue [Line Items]
Total revenue	34,954	30,622
Global Services | Operating Segments | Consulting and Network Design
Disaggregation of Revenue [Line Items]
Total revenue	$ 9,754	$ 9,490

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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