Commitments and Contingencies (Details) $ in Thousands, $ in Millions		3 Months Ended		9 Months Ended			29 Months Ended
	Apr. 01, 2014 lawsuit	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)	Jul. 31, 2019 USD ($) government_entity	Jul. 31, 2019 CAD ($) government_entity	Jul. 31, 2018 USD ($)	Jul. 31, 2019 USD ($)	Jul. 31, 2019 CAD ($)	Jul. 31, 2019 CAD ($)
Loss Contingencies [Line Items]
Maximum amount of Canadian grant		$ 43,600		$ 43,600			$ 43,600		$ 57.6
Number of Canadian government entities | government_entity				3	3
Total revenue		960,606	$ 818,817	$ 2,604,144		$ 2,194,930
Amounts receivable from grant		8,200		8,200			8,200		$ 10.8
Customer concentration risk | Sales revenue, net
Loss Contingencies [Line Items]
Total revenue		$ 242,128	$ 270,856	909,155		$ 484,928
Grants
Loss Contingencies [Line Items]
Total revenue				$ 7,000	$ 9.3		$ 19,600	$ 25.9
Beaver County Employees Retirement Fund et al. v. Cyan, Inc. et al.
Loss Contingencies [Line Items]
Number of lawsuits filed | lawsuit	2