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PENSION AND OTHER POSTRETIREMENT BENEFITS - Summary (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 120 $ 116 $ 359 $ 349
Interest expense 1,155 1,063 3,464 3,189
Expected return on plan assets (1,286) (1,264) (3,858) (3,793)
Amortization of prior service cost 11 10 32 31
Settlement loss 91 0 609 0
Actuarial loss 422 511 1,267 1,533
Net periodic pension cost (benefit) 513 436 1,873 1,309
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4 3 11 10
Interest expense 83 85 248 254
Amortization of prior service cost (177) (178) (532) (533)
Actuarial loss 109 115 328 345
Net periodic pension cost (benefit) $ 19 $ 25 $ 55 $ 76