Accumulated Other Comprehensive Income

6 Months Ended

Mar. 31, 2017

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 and six months ended March 31, 2017 and 2016:

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 prior service costs	239			—			239
Reclassifications of net losses on IRPAs	—			481			481
AOCI — March 31, 2017	$	(11,356	)	$	(18,808	)	$	(30,164	)
Three Months Ended March 31, 2016	Postretirement Benefit Plans			Derivative Instruments			Total
AOCI — December 31, 2015	$	(9,116	)	$	(2,143	)	$	(11,259	)
Net losses on IRPAs	—			(18,820		)	(18,820		)
Reclassifications of benefit plan actuarial losses and prior service costs	160			—			160
Reclassifications of net losses on IRPAs	—			356			356
AOCI — March 31, 2016	$	(8,956	)	$	(20,607	)	$	(29,563	)

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 prior service costs	478			—			478
Reclassifications of net losses on IRPAs	—			976			976
AOCI — March 31, 2017	$	(11,356	)	$	(18,808	)	$	(30,164	)
Six Months Ended March 31, 2016	Postretirement Benefit Plans			Derivative Instruments			Total
AOCI — September 30, 2015	$	(9,276	)	$	(4,410	)	$	(13,686	)
Net losses on IRPAs	—			(16,943		)	(16,943		)
Reclassifications of benefit plans actuarial losses and prior service costs	320			—			320
Reclassifications of net losses on IRPAs	—			746			746
AOCI — March 31, 2016	$	(8,956	)	$	(20,607	)	$	(29,563	)