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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Jun. 30, 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
Nine Months Ended
Three Months Ended
Nine Months Ended
 
June 30,
June 30,
June 30,
June 30,
(Thousands)
2017
2016
2017
2016
2017
2016
2017
2016
Service cost
$
2,086

$
1,897

$
6,260

$
5,693

$
1,095

$
1,130

$
3,285

$
3,391

Interest cost
2,443

2,836

7,328

8,507

1,386

1,564

4,159

4,692

Expected return on plan assets
(4,829
)
(5,029
)
(14,485
)
(15,088
)
(1,192
)
(1,211
)
(3,575
)
(3,633
)
Recognized actuarial loss
2,207

1,820

6,620

5,461

1,093

819

3,278

2,456

Prior service cost amortization
28

28

83

83

(91
)
(91
)
(273
)
(273
)
Net periodic benefit cost
$
1,935

$
1,552

$
5,806

$
4,656

$
2,291

$
2,211

$
6,874

$
6,633