Commitments and Contingencies (Details) $ in Thousands, $ in Millions	3 Months Ended			23 Months Ended		72 Months Ended
	Jan. 31, 2019 USD ($) government_entity	Jan. 31, 2019 CAD ($) government_entity	Jan. 31, 2018 USD ($)	Jan. 31, 2019 USD ($)	Jan. 31, 2019 CAD ($)	Oct. 31, 2017	Jan. 31, 2019 CAD ($)
Loss Contingencies [Line Items]
Maximum amount of Canadian grant	$ 44,000			$ 44,000			$ 57.6
Number of Canadian government entities | government_entity	3	3
Total revenue | $	$ 778,527		$ 646,135
Amounts receivable from grant	7,700			7,700			$ 10.1
ASEAN country | Customer concentration risk | Sales Revenue, Net
Loss Contingencies [Line Items]
Concentration risk, percentage						1.50%
Grants
Loss Contingencies [Line Items]
Total revenue	$ 1,900	$ 2.5		$ 14,800	$ 19.1