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ACCUMULATED OTHER COMPREHENSIVE INCOME LOSS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Changes in foreign currency translation          
Beginning accumulated foreign currency translation $ 780 $ 642 $ 691 $ 925  
Change in cumulative translation adjustment before reclassifications (125) 89 (36) (194)  
Income taxes 0 0 0 0  
Net current period other comprehensive (loss) income (125) 89 (36) (194)  
Ending accumulated foreign currency translation 655 731 655 731  
Changes in retirement plans          
Beginning accumulated retirement plans benefit cost (949) (1,406) (3,608) (1,439)  
Amortization of net actuarial loss and prior service cost 20 9 100 42  
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 9 2,679 42  
Ending accumulated retirement plans benefit cost (929) (1,397) (929) (1,397)  
Accumulated other comprehensive loss, net of taxes $ (274) $ (666) $ (274) $ (666) $ (2,917)