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LEASES (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
LEASES    
Lease, Practical Expedient, Use of Hindsight [true false] false  
Operating lease expense $ 2.5 $ 2.4
Weighted-average remaining term 4 years 1 month 6 days  
Weighted-average discount rate 1.60%  
Minimum    
LEASES    
Lease term (in years) 2 years  
Maximum    
LEASES    
Lease term (in years) 5 years