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EMPLOYEE BENEFIT PLANS (Tables)
3 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
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:
 
Pension
OPEB
 
Three Months Ended
Three Months Ended
 
December 31,
December 31,
(Thousands)
2015
2014
2015
2014
Service cost
$
1,898

$
1,871

$
1,130

$
1,063

Interest cost
2,836

2,550

1,564

1,435

Expected return on plan assets
(5,029
)
(4,272
)
(1,211
)
(1,244
)
Recognized actuarial loss
1,820

1,745

819

736

Prior service cost amortization
28

28

(91
)
(91
)
Net periodic benefit cost
$
1,553

$
1,922

$
2,211

$
1,899