Segments and Entity-Wide Disclosures - Revenue by Major Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Revenue, Major Customer [Line Items]
Total revenue	$ 832,912	$ 778,527
Customer concentration risk
Revenue, Major Customer [Line Items]
Total revenue	198,558	272,461
Verizon | Customer concentration risk
Revenue, Major Customer [Line Items]
Total revenue	114,548	88,775
Verizon | Customer concentration risk
Revenue, Major Customer [Line Items]
Total revenue	$ 84,010	94,172
Web-scale provider | Customer concentration risk
Revenue, Major Customer [Line Items]
Total revenue		$ 89,514