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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Mar. 31, 2014
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)
2014
2013
2014
2013
2014
2013
2014
2013
Service cost
$
1,536

$
1,718

$
3,072

$
3,436

$
981

$
1,171

$
1,962

$
2,342

Interest cost
2,517

2,235

5,033

4,470

1,433

1,287

2,866

2,574

Expected return on plan assets
(3,869
)
(3,706
)
(7,738
)
(7,412
)
(1,043
)
(913
)
(2,087
)
(1,826
)
Recognized actuarial loss
1,399

1,911

2,798

3,822

625

964

1,250

1,928

Prior service cost amortization
28

27

56

54

(89
)
7

(178
)
14

Recognized net initial obligation
—

—

—

—

2

(89
)
5

(178
)
Net periodic benefit cost
$
1,611

$
2,185

$
3,221

$
4,370

$
1,909

$
2,427

$
3,818

$
4,854