Commitments and Contingencies (Details) $ in Thousands, $ in Millions	3 Months Ended		6 Months Ended			26 Months Ended		72 Months Ended
	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	Apr. 30, 2019 USD ($) government_entity	Apr. 30, 2019 CAD ($) government_entity	Apr. 30, 2018 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2019 CAD ($)	Oct. 31, 2017	Apr. 30, 2019 CAD ($)
Loss Contingencies [Line Items]
Maximum amount of Canadian grant	$ 42,900		$ 42,900			$ 42,900			$ 57.6
Number of Canadian government entities | government_entity			3	3
Total revenue	865,011	$ 729,978	$ 1,643,538		$ 1,376,113
Amounts receivable from grant	5,900		5,900			5,900			$ 7.9
Customer concentration risk | Sales revenue, net
Loss Contingencies [Line Items]
Total revenue	$ 214,766	$ 85,419	572,565		$ 176,065
ASEAN country | Customer concentration risk | Sales revenue, net
Loss Contingencies [Line Items]
Concentration risk, percentage								1.50%
Grants
Loss Contingencies [Line Items]
Total revenue			$ 4,900	$ 6.5		$ 17,200	$ 23.1