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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
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:
 
Pension
OPEB
 
Three Months Ended
Nine Months Ended
Three Months Ended
Nine Months Ended
 
June 30,
June 30,
June 30,
June 30,
(Thousands)
2020
2019
2020
2019
2020
2019
2020
2019
Service cost
$
2,056

$
1,845

$
6,167

$
5,536

$
1,213

$
1,101

$
3,640

$
3,303

Interest cost
2,647

3,043

7,940

9,129

1,757

2,081

5,270

6,243

Expected return on plan assets
(5,145
)
(4,763
)
(15,434
)
(14,290
)
(1,628
)
(1,379
)
(4,883
)
(4,137
)
Recognized actuarial loss
2,606

1,442

7,818

4,324

1,861

1,617

5,582

4,850

Prior service cost amortization
25

25

76

76

(49
)
(91
)
(148
)
(273
)
Net periodic benefit cost
$
2,189

$
1,592

$
6,567

$
4,775

$
3,154

$
3,329

$
9,461

$
9,986