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SEGMENT INFORMATION (Schedule of Net Sales and Service Fees by Product Category) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 31, 2020
Jul. 31, 2020
Apr. 30, 2020
Jan. 31, 2020
Oct. 31, 2019
Jul. 31, 2019
Apr. 30, 2019
Jan. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Revenue from External Customer [Line Items]                      
Net Sales and Service Fees $ 44,459 $ 45,382 $ 37,126 $ 43,660 $ 59,989 $ 58,501 $ 70,674 $ 74,213 $ 170,627 $ 263,377 $ 300,671
Computerized Machine Tools [Member]                      
Revenue from External Customer [Line Items]                      
Net Sales and Service Fees                 139,577 223,735 261,710
Computer Control Systems and Software [Member]                      
Revenue from External Customer [Line Items]                      
Net Sales and Service Fees [1]                 1,699 2,818 2,870
Service Parts [Member]                      
Revenue from External Customer [Line Items]                      
Net Sales and Service Fees                 22,484 27,854 27,501
Service Fees [Member]                      
Revenue from External Customer [Line Items]                      
Net Sales and Service Fees                 $ 6,867 $ 8,970 $ 8,590
[1] Amounts shown do not include computer control systems and software sold as an integrated component of computerized machine systems.