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LEASES (Details) - USD ($)
$ in Millions
9 Months Ended
Jul. 31, 2020
Jul. 31, 2019
LEASES    
Lease, Practical Expedient, Use of Hindsight [true false] false  
Operating lease expense $ 3.7 $ 3.7
Weighted-average remaining term 4 years 1 month 6 days  
Weighted-average discount rate 1.50%  
Minimum    
LEASES    
Lease term (in years) 2 years  
Maximum    
LEASES    
Lease term (in years) 5 years