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SEGMENTS AND ENTITY-WIDE DISCLOSURES - Narrative (Details)
$ in Thousands
9 Months Ended
Jul. 31, 2021
USD ($)
segment
Oct. 31, 2020
USD ($)
Segment Reporting [Abstract]    
Equipment, building, furniture and fixtures, net $ 288,937 $ 272,377
Operating right-of-use assets $ 48,937 $ 57,026
Number of operating segments | segment 4