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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Changes in foreign currency translation      
Beginning accumulated foreign currency translation $ 691 $ 925  
Change in cumulative translation adjustment before reclassifications 5 (413)  
Income taxes 0 0  
Net current period other comprehensive income (loss) 5 (413)  
Ending accumulated foreign currency translation 696 512  
Changes in retirement plans      
Beginning accumulated retirement plans benefit cost (3,608) (1,439)  
Amortization of net actuarial loss and prior service cost 60 17  
Net actuarial gains arising during the period 2,579 0  
Net current period other comprehensive income 2,639 17  
Income taxes 0 0  
Ending accumulated retirement plans benefit cost (969) (1,422)  
Accumulated other comprehensive loss, net of taxes $ (273) $ (910) $ (2,917)