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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Dec. 31, 2017
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, 2017 and 2016:
 
 
 
 
 
 
 

Three Months Ended December 31, 2017
 
Postretirement Benefit Plans
 
Derivative Instruments
 
Total
AOCI — September 30, 2017
 
$
(8,995
)
 
$
(17,796
)
 
$
(26,791
)
Reclassifications of benefit plans actuarial losses and net prior service credits
 
220

 
—

 
220

Reclassifications of net losses on IRPAs
 
—

 
592

 
592

AOCI — December 31, 2017
 
$
(8,775
)
 
$
(17,204
)
 
$
(25,979
)
 
 
 
 
 
 
 
Three Months Ended December 31, 2016
 
Postretirement Benefit Plans
 
Derivative Instruments
 
Total
AOCI — September 30, 2016
 
$
(11,834
)
 
$
(19,784
)
 
$
(31,618
)
Reclassifications of benefit plans actuarial losses and net prior service credits
 
239

 
—

 
239

Reclassifications of net losses on IRPAs
 
—

 
495

 
495

AOCI — December 31, 2016
 
$
(11,595
)
 
$
(19,289
)
 
$
(30,884
)