Revenue Revenue - Geographical Distribution of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenue	$ 3,572,131	$ 3,094,286	$ 2,801,687
North America
Disaggregation of Revenue [Line Items]
Total revenue	2,351,260	1,886,450	1,736,047
EMEA
Disaggregation of Revenue [Line Items]
Total revenue	566,718	464,876	404,099
CALA
Disaggregation of Revenue [Line Items]
Total revenue	152,653	140,177	164,308
APAC
Disaggregation of Revenue [Line Items]
Total revenue	$ 501,500	$ 602,783	$ 497,233