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EMPLOYEE BENEFIT PLANS - Components of net periodic pension expense (benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Components of the net periodic pension expense (benefit)        
Interest cost $ 1,097 $ 1,013 $ 3,291 $ 3,041
Expected return on plan assets (1,386) (1,386) (4,158) (4,158)
Recognized net actuarial loss 291 461 874 1,382
Settlement 1,548 0 1,548 0
Net pension expense $ 1,550 $ 88 $ 1,555 $ 265