Commitments and Contingencies (Details) $ in Thousands, $ in Millions	12 Months Ended				32 Months Ended
	Oct. 31, 2019 USD ($) government_entity	Oct. 31, 2019 CAD ($) government_entity	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Oct. 31, 2019 USD ($)	Oct. 31, 2019 CAD ($)	Oct. 31, 2019 CAD ($)	Oct. 31, 2018 CAD ($)
Operating Leased Assets [Line Items]
Maximum amount of Canadian grant			$ 43,800					$ 57.6
Number of Canadian government entities | government_entity	3	3
Total revenue	$ 3,572,131		3,094,286	$ 2,801,687
Amounts receivable from grant	7,900				$ 7,900		$ 10.4
Leases
2020	28,776				28,776
2021	24,184				24,184
2022	16,767				16,767
2023	13,393				13,393
2024	10,632				10,632
Thereafter	26,110				26,110
Total	119,862				119,862
Operating lease, rental expense
Rental expense	22,000		24,100	30,900
Restructured facilities and unfavorable lease
Operating lease, rental expense
Rental expense	1,300		$ 1,900	$ 2,700
Grant
Operating Leased Assets [Line Items]
Total revenue	$ 9,200	$ 12.3			$ 22,000	$ 28.9