Summary of Significant Accounting Policies (Details) - USD ($)	Nov. 01, 2019	Apr. 30, 2020	Oct. 31, 2019
Summary of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets		$ 261,660,000	$ 0
Operating lease liabilities		$ 310,860,000	$ 0
Accounting Standards Update 2016-02 [Member]
Summary of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets	$ 270,000,000.0
Lease term for leases considered short-term and not included in the Balance Sheet	12 months
Operating lease liabilities	$ 318,800,000
Cumulative-effect on retained earnings	0
Deferred rent receivables	$ 48,800,000