Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Nov. 01, 2019	Oct. 31, 2019	[1]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating lease right-of-use assets, net	$ 462,778		$ 0
Operating lease, liability	$ 534,559
Accounting Standards Update 2016-02
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating lease right-of-use assets, net		$ 475,000
Operating lease, liability		$ 540,000

[1] Derived from audited financial statements.