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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Nonunion) (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
person
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Pension and other postretirement benefit plans                
Pension settlement expense, pre-tax             $ 1,603 $ 3,644
Pension settlement expense, net of tax     $ 384 $ 577     1,190 2,227
Nonunion Defined Benefit Pension Plan                
Pension and other postretirement benefit plans                
Pension settlement expense, pre-tax     518 943     1,603 3,644
Pension settlement expense, net of tax     400 600     1,200 2,200
Lump-sum distributions     $ 3,100 $ 5,800     11,600 $ 23,100
Premium paid to purchase nonparticipating annuity contract         $ 7,600      
Number of plan participants for which vested pension benefits were settled | person         50      
Employer contributions $ 5,500           $ 5,500  
Nonunion Defined Benefit Pension Plan | Forecast                
Pension and other postretirement benefit plans                
Employer contributions   $ 13,000            
Nonunion Defined Benefit Pension Plan | Minimum | Forecast                
Pension and other postretirement benefit plans                
Pension settlement expense, pre-tax           $ 15,000    
Nonunion Defined Benefit Pension Plan | Maximum | Forecast                
Pension and other postretirement benefit plans                
Pension settlement expense, pre-tax           $ 21,000