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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Mar. 31, 2013
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)
2013
2012
2013
2012
2013
2012
2013
2012
Service cost
$
1,718

$
1,344

$
3,436

$
2,688

$
1,171

$
896

$
2,342

$
1,792

Interest cost
2,235

2,206

4,470

4,412

1,287

1,283

2,574

2,566

Expected return on plan assets
(3,706
)
(3,171
)
(7,412
)
(6,342
)
(913
)
(686
)
(1,826
)
(1,372
)
Recognized actuarial loss
1,911

1,254

3,822

2,508

964

724

1,928

1,448

Prior service cost amortization
27

11

54

22

7

6

14

12

Recognized net initial obligation
—

—

—

—

(89
)
89

(178
)
178

Net periodic benefit cost
$
2,185

$
1,644

$
4,370

$
3,288

$
2,427

$
2,312

$
4,854

$
4,624