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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Income
The tables below present changes in AOCI, net of tax, during the three months ended December 31, 2015 and 2014:
 
 
 
 
 
 
 

 
 
Postretirement Benefit Plans
 
Derivative Instruments
 
Total
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 plan 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
)
Three Months Ended December 31, 2014
 
 
 
 
 
 
AOCI - September 30, 2014
 
$
(6,311
)
 
$
(1,870
)
 
$
(8,181
)
Reclassifications of benefit plan actuarial losses and prior service costs
 
131

 
—

 
131

Reclassifications of net losses on IRPAs
 
—

 
391

 
391

AOCI - December 31, 2014
 
$
(6,180
)
 
$
(1,479
)
 
$
(7,659
)