Derivative Instruments and Hedging Activities (Tables)

9 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Balance Sheet Location and Fair Value of Derivative Assets and Liabilities

The following table presents the Company’s derivative assets and liabilities, as well as the effects of offsetting, as of June 30, 2018, September 30, 2017 and June 30, 2017:

	June 30, 2018			September 30, 2017			June 30, 2017
Derivative assets:
Derivatives subject to PGC and DS mechanisms:
Commodity contracts	$	1,963		$	1,665		$	1,163
Derivatives not subject to PGC and DS mechanisms:
Commodity contracts	134			142			—
Total derivative assets — gross	2,097			1,807			1,163
Gross amounts offset in the balance sheet	(101		)	(450		)	(159		)
Total derivative assets — net (a)	$	1,996		$	1,357		$	1,004
Derivative liabilities:
Derivatives subject to PGC and DS mechanisms:
Commodity contracts	$	(101	)	$	(1,520	)	$	(1,204	)
Derivatives not subject to PGC and DS mechanisms:
Commodity contracts	—			—			(21		)
Total derivative liabilities — gross	(101		)	(1,520		)	(1,225		)
Gross amounts offset in the balance sheet	101			450			159
Total derivative liabilities — net (a)	$	—		$	(1,070	)	$	(1,066	)

Effects of Derivative Instruments on the Condensed Consolidated Statements of Income and Changes in AOCI and Noncontrolling Interest

The following table provides information on the effects of derivative instruments not subject to ratemaking mechanisms on the condensed consolidated statements of income and changes in AOCI for the three and nine months ended June 30, 2018 and 2017:

	Loss Reclassified from AOCI into Income						Location of Loss Reclassified from AOCI into Income
Three Months Ended June 30,	2018			2017
Cash Flow Hedges:
Interest rate contracts	$	(871	)	$	(856	)	Interest expense
	Gain (Loss) Recognized in Income						Location of Gain (Loss) Recognized in Income
Three Months Ended June 30,	2018			2017
Derivatives Not Subject to PGC and DS Mechanisms:
Commodity contracts	$	37		$	(57	)	Operating and administrative expenses
	Loss Reclassified from AOCI into Income						Location of Loss Reclassified from AOCI into Income
Nine Months Ended June 30,	2018			2017
Cash Flow Hedges:
Interest rate contracts	$	(2,614	)	$	(2,524	)	Interest expense
	Gain (Loss) Recognized in Income						Location of Gain (Loss) Recognized in Income
Nine Months Ended June 30,	2018			2017
Derivatives Not Subject to PGC and DS Mechanisms:
Commodity contracts	$	198		$	(25	)	Operating and administrative expenses