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Leases - Narrative (Details)
$ in Thousands, ft² in Millions
3 Months Ended
Jan. 31, 2020
USD ($)
ft²
Jan. 31, 2019
USD ($)
Oct. 31, 2019
USD ($)
Oct. 31, 2018
USD ($)
Lessee, Lease, Description [Line Items]        
Area leased (in sq ft) | ft² 1.4      
Remaining lease term (up to) 13 years      
Extension term (up to) 10 years      
Termination period (up to) 8 years      
Restructuring reserve $ 2,232 $ 2,563 $ 15,143 $ 3,847
Operating lease expense   6,800    
Leasehold improvements        
Lessee, Lease, Description [Line Items]        
Amortization $ 4,300 $ 2,400    
Consolidation of excess facilities and other restructuring activities        
Lessee, Lease, Description [Line Items]        
Restructuring reserve     $ 11,100