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EMPLOYEE BENEFIT PLANS, ACCUMULATED BENEFIT OBLIGATION (Details) - Pension - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 293,654 $ 255,987
Accumulated benefit obligation 252,077 217,937
Fair value of plan assets $ 249,875 $ 199,123