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EMPLOYEE BENEFIT PLANS - Net Periodic Post-retirement Benefit Cost (Details) - Post-retirement benefit plan - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Net periodic post-retirement benefit cost        
Service cost $ 11 $ 9 $ 22 $ 18
Interest cost 18 16 36 32
Recognized actuarial loss 1 1 2 2
Net periodic cost $ 30 $ 26 $ 60 $ 52