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EMPLOYEE BENEFIT PLANS (Tables)
 3 Months Ended
Dec. 31, 2025
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Cost
The components of the net periodic cost for pension benefits, including the Company's Pension Equalization Plan, and OPEB costs (principally health care and life insurance) for employees and covered dependents were as follows:
PensionOPEB
Three Months EndedThree Months Ended
December 31,December 31,
(Thousands)2025202420252024
Service cost$1,245 $1,381 $272 $273 
Interest cost3,964 3,858 2,698 2,097 
Expected return on plan assets(6,137)(5,925)(2,259)(2,346)
Recognized actuarial loss38 301 2,796 1,793 
Prior service cost (credit) amortization— — (3,270)(3,270)
Net periodic benefit (credit) cost$(890)$(385)$237 $(1,453)