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REVENUE - Contract Balances (Details) - USD ($)
$ in Thousands
Jul. 31, 2021
Oct. 31, 2020
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net $ 878,229 $ 719,405
Contract assets for unbilled accounts receivable, net 98,812 85,843
Deferred revenue $ 183,899 $ 158,363