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SELECTED FINANCIAL STATEMENT INFORMATION (Accounts Receivable) (Details) - USD ($)
$ in Thousands
Apr. 30, 2019
Oct. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 263,166 $ 240,544
Less: Allowance for doubtful accounts (3,696) (3,258)
Accounts receivable, net $ 259,470 $ 237,286