Segments and Entity-Wide Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Oct. 31, 2018
Segment Reporting Information [Line Items]
Equipment, building, furniture and fixtures, net	$ 282,022		$ 282,022		$ 292,067
Goodwill	297,711		297,711		297,968
Maintenance spares, net	50,900		50,900
Net revenue	865,011	$ 729,978	1,643,538	$ 1,376,113
United States
Segment Reporting Information [Line Items]
Equipment, building, furniture and fixtures, net	67,633		67,633		$ 75,479
Net revenue	545,600	$ 392,800	1,010,000	$ 776,100
Networking Platforms
Segment Reporting Information [Line Items]
Intangible assets, net	25,000		25,000
Goodwill	65,500		65,500
Software and Software-Related Services
Segment Reporting Information [Line Items]
Intangible assets, net	105,000		105,000
Goodwill	$ 232,200		$ 232,200