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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Changes in foreign currency translation          
Beginning accumulated foreign currency translation $ 226 $ 780 $ 545 $ 691  
Change in cumulative translation adjustment before reclassifications (74) (125) (393) (36)  
Income taxes 0 0 0 0  
Net current period other comprehensive loss (74) (125) (393) (36)  
Ending accumulated foreign currency translation 152 655 152 655  
Changes in retirement plans          
Beginning accumulated retirement plans benefit cost (1,914) (949) (1,980) (3,608)  
Amortization of net actuarial loss and prior service cost 26 20 92 100  
Net actuarial gains arising during the period 0 0 0 2,579  
Gain on termination of post-retirement medical plan 541 0 541 0  
Income taxes 0 0 0 0  
Net current period other comprehensive income 567 20 633 2,679  
Ending accumulated retirement plans benefit cost (1,347) (929) (1,347) (929)  
Accumulated other comprehensive loss, net of taxes $ (1,195) $ (274) $ (1,195) $ (274) $ (1,435)