Revenue - Geographical Distribution of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 960,606	$ 818,817	$ 2,604,144	$ 2,194,930
North America
Disaggregation of Revenue [Line Items]
Total revenue	617,000		1,678,599
EMEA
Disaggregation of Revenue [Line Items]
Total revenue	169,532		413,715
CALA
Disaggregation of Revenue [Line Items]
Total revenue	39,261		109,635
APAC
Disaggregation of Revenue [Line Items]
Total revenue	$ 134,813		$ 402,195