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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Changes in foreign currency translation          
Beginning accumulated foreign currency translation $ 642 $ 866 $ 925 $ 1,053  
Change in cumulative translation adjustment before reclassifications 89 (76) (194) (263)  
Income taxes 0 0 0 0  
Net current period other comprehensive income (loss) 89 (76) (194) (263)  
Ending accumulated foreign currency translation 731 790 731 790  
Changes in retirement plans          
Beginning accumulated retirement plans benefit cost (1,406) (2,048) (1,439) (2,111)  
Amortization of net actuarial loss and prior service cost 9 30 42 93  
Income taxes 0 0 0 0  
Net current period other comprehensive income 9 30 42 93  
Ending accumulated retirement plans benefit cost (1,397) (2,018) (1,397) (2,018)  
Accumulated other comprehensive loss, net of taxes $ (666) $ (1,228) $ (666) $ (1,228) $ (514)