Revenue - Geographical Distribution of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 865,011	$ 729,978	$ 1,643,538	$ 1,376,113
North America
Disaggregation of Revenue [Line Items]
Total revenue	576,093		1,061,599
EMEA
Disaggregation of Revenue [Line Items]
Total revenue	114,993		244,183
CALA
Disaggregation of Revenue [Line Items]
Total revenue	39,399		70,374
APAC
Disaggregation of Revenue [Line Items]
Total revenue	$ 134,526		$ 267,382