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Accumulated Other Comprehensive Income
 3 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Accumulated Other Comprehensive Income
Note 11 — Accumulated Other Comprehensive Income

The tables below present changes in AOCI, net of tax, during the three months ended December 31, 2016 and 2015:
 
 
 
 
 
 
 

 
 
Postretirement Benefit Plans
 
Derivative Instruments
 
Total
Three Months Ended December 31, 2016
 
 
 
 
 
 
AOCI - September 30, 2016
 
$
(11,834
)
 
$
(19,784
)
 
$
(31,618
)
Reclassifications of benefit plans actuarial losses and prior service costs
 
239

 
—

 
239

Reclassifications of net losses on IRPAs
 
—

 
495

 
495

AOCI - December 31, 2016
 
$
(11,595
)
 
$
(19,289
)
 
$
(30,884
)
Three Months Ended December 31, 2015
 
 
 
 
 
 
AOCI - September 30, 2015
 
$
(9,276
)
 
$
(4,410
)
 
$
(13,686
)
Net gains on IRPAs
 
—

 
1,877

 
1,877

Reclassifications of benefit plans actuarial losses and prior service costs
 
160

 
—

 
160

Reclassifications of net losses on IRPAs
 
—

 
390

 
390

AOCI - December 31, 2015
 
$
(9,116
)
 
$
(2,143
)
 
$
(11,259
)