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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Changes in foreign currency translation      
Beginning accumulated foreign currency translation $ 925 $ 1,053  
Change in cumulative translation adjustment before reclassifications (413) (6)  
Income taxes 0 0  
Net current period other comprehensive loss (413) (6)  
Ending accumulated foreign currency translation 512 1,047  
Changes in retirement plans      
Beginning accumulated retirement plans benefit cost (1,439) (2,111)  
Amortization of net actuarial loss and prior service cost 17 24  
Income taxes 0 0  
Net current period other comprehensive income 17 24  
Ending accumulated retirement plans benefit cost (1,422) (2,087)  
Accumulated other comprehensive loss, net of taxes $ (910) $ (1,040) $ (514)