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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Changes in foreign currency translation          
Beginning accumulated foreign currency translation $ 696 $ 512 $ 691 $ 925  
Change in cumulative translation adjustment before reclassifications 84 130 89 (283)  
Income taxes 0 0 0 0  
Net current period other comprehensive income (loss) 84 130 89 (283)  
Ending accumulated foreign currency translation 780 642 780 642  
Changes in retirement plans          
Beginning accumulated retirement plans benefit cost (969) (1,422) (3,608) (1,439)  
Amortization of net actuarial loss and prior service cost 20 16 80 33  
Net actuarial gains arising during the period 0 0 2,579 0  
Income taxes 0 0 0 0  
Net current period other comprehensive income 20 16 2,659 33  
Ending accumulated retirement plans benefit cost (949) (1,406) (949) (1,406)  
Accumulated other comprehensive loss, net of taxes $ (169) $ (764) $ (169) $ (764) $ (2,917)