Accumulated Other Comprehensive Income

6 Months Ended

Mar. 31, 2018

Equity [Abstract]

Accumulated Other Comprehensive Income

Note 12 — Accumulated Other Comprehensive Income

The tables below present changes in AOCI, net of tax, during the three and six months ended March 31, 2018 and 2017:

Three Months Ended March 31, 2018	Postretirement Benefit Plans			Derivative Instruments			Total
AOCI — December 31, 2017	$	(8,775	)	$	(17,204	)	$	(25,979	)
Reclassifications of benefit plan actuarial losses and net prior service credits	220			—			220
Reclassifications of net losses on IRPAs	—			592			592
AOCI — March 31, 2018	$	(8,555	)	$	(16,612	)	$	(25,167	)
Three Months Ended March 31, 2017	Postretirement Benefit Plans			Derivative Instruments			Total
AOCI — December 31, 2016	$	(11,595	)	$	(19,289	)	$	(30,884	)
Reclassifications of benefit plan actuarial losses and net prior service credits	239			—			239
Reclassifications of net losses on IRPAs	—			481			481
AOCI — March 31, 2017	$	(11,356	)	$	(18,808	)	$	(30,164	)

Six Months Ended March 31, 2018	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	440			—			440
Reclassifications of net losses on IRPAs	—			1,184			1,184
AOCI — March 31, 2018	$	(8,555	)	$	(16,612	)	$	(25,167	)
Six Months Ended March 31, 2017	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	478			—			478
Reclassifications of net losses on IRPAs	—			976			976
AOCI — March 31, 2017	$	(11,356	)	$	(18,808	)	$	(30,164	)