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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Mar. 31, 2017
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
Six Months Ended
Three Months Ended
Six Months Ended
 
March 31,
March 31,
March 31,
March 31,
(Thousands)
2017
2016
2017
2016
2017
2016
2017
2016
Service cost
$
2,087

$
1,898

$
4,174

$
3,796

$
1,095

$
1,131

$
2,190

$
2,261

Interest cost
2,442

2,835

4,885

5,671

1,387

1,564

2,773

3,128

Expected return on plan assets
(4,828
)
(5,030
)
(9,656
)
(10,059
)
(1,191
)
(1,211
)
(2,383
)
(2,422
)
Recognized actuarial loss
2,206

1,821

4,413

3,641

1,092

818

2,185

1,637

Prior service cost amortization
28

27

55

55

(91
)
(91
)
(182
)
(182
)
Net periodic benefit cost
$
1,935

$
1,551

$
3,871

$
3,104

$
2,292

$
2,211

$
4,583

$
4,422