10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

(Mark One)

þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2018

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                    to                    

Commission File Number 1-10042

Atmos Energy Corporation

(Exact name of registrant as specified in its charter)

Texas and Virginia	75-1743247
(State or other jurisdiction of incorporation or organization)	(IRS employer identification no.)
Three Lincoln Centre, Suite 1800 5430 LBJ Freeway, Dallas, Texas	75240 (Zip code)
(Address of principal executive offices)

(972) 934-9227

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yesþ No¨

Indicate by check mark whether the registrant has submitted electronically and posted on its website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes þNo ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company”, and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

Large Accelerated Filer  þ Accelerated Filer  ¨ Non-Accelerated Filer  ¨ Smaller Reporting Company  ¨ Emerging growth company ¨

(Do not check if a smaller reporting company)

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act)    Yes ¨ No þ

Number of shares outstanding of each of the issuer’s classes of common stock, as of April 27, 2018.

Class	Shares Outstanding
No Par Value	111,064,659

GLOSSARY OF KEY TERMS

Adjusted diluted EPS from continuing operations	Non-GAAP measure defined as diluted earnings per share from continuing operations before the one-time, non-cash income tax benefit
Adjusted income from continuing operations	Non-GAAP measure defined as income from continuing operations before the one-time, non-cash income tax benefit
AEC	Atmos Energy Corporation
AEH	Atmos Energy Holdings, Inc.
AEM	Atmos Energy Marketing, LLC
AOCI	Accumulated other comprehensive income
ARM	Annual Rate Mechanism
Bcf	Billion cubic feet
Contribution Margin	Non-GAAP measure defined as operating revenues less purchased gas cost
DARR	Dallas Annual Rate Review
ERISA	Employee Retirement Income Security Act of 1974
FASB	Financial Accounting Standards Board
GAAP	Generally Accepted Accounting Principles
GRIP	Gas Reliability Infrastructure Program
GSRS	Gas System Reliability Surcharge
Mcf	Thousand cubic feet
MMcf	Million cubic feet
Moody’s	Moody’s Investors Services, Inc.
NTSB	National Transportation Safety Board
PPA	Pension Protection Act of 2006
PRP	Pipeline Replacement Program
RRC	Railroad Commission of Texas
RRM	Rate Review Mechanism
RSC	Rate Stabilization Clause
S&P	Standard & Poor’s Corporation
SAVE	Steps to Advance Virginia Energy
SEC	United States Securities and Exchange Commission
SGR	Supplemental Growth Filing
SIR	System Integrity Rider
SRF	Stable Rate Filing
SSIR	System Safety and Integrity Rider
TCJA	Tax Cuts and Jobs Act of 2017
WNA	Weather Normalization Adjustment

2

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

ATMOS ENERGY CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS

	March 31, 2018			September 30, 2017
	(Unaudited)
	(In thousands, except share data)
ASSETS
Property, plant and equipment	$	11,903,715		$	11,301,304
Less accumulated depreciation and amortization	2,142,386			2,042,122
Net property, plant and equipment	9,761,329			9,259,182
Current assets
Cash and cash equivalents	71,074			26,409
Accounts receivable, net	407,134			222,263
Gas stored underground	89,265			184,653
Other current assets	55,263			106,321
Total current assets	622,736			539,646
Goodwill	730,132			730,132
Deferred charges and other assets	242,125			220,636
	$	11,356,322		$	10,749,596
CAPITALIZATION AND LIABILITIES
Shareholders’ equity
Common stock, no par value (stated at $0.005 per share); 200,000,000 shares authorized; issued and outstanding: March 31, 2018 — 111,060,328 shares; September 30, 2017 — 106,104,634 shares	$	555		$	531
Additional paid-in capital	2,951,545			2,536,365
Accumulated other comprehensive loss	(85,011		)	(105,254		)
Retained earnings	1,854,257			1,467,024
Shareholders’ equity	4,721,346			3,898,666
Long-term debt	2,617,892			3,067,045
Total capitalization	7,339,238			6,965,711
Current liabilities
Accounts payable and accrued liabilities	230,823			233,050
Other current liabilities	538,702			332,648
Short-term debt	129,602			447,745
Current maturities of long-term debt	450,000			—
Total current liabilities	1,349,127			1,013,443
Deferred income taxes	1,107,036			1,878,699
Regulatory excess deferred taxes (See Note 6)	737,798			—
Regulatory cost of removal obligation	484,746			485,420
Pension and postretirement liabilities	237,448			230,588
Deferred credits and other liabilities	100,929			175,735
	$	11,356,322		$	10,749,596

See accompanying notes to condensed consolidated financial statements.

3

ATMOS ENERGY CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

	Three Months Ended   March 31
	2018			2017
	(Unaudited) (In thousands, except per share data)
Operating revenues
Distribution segment	$	1,199,291		$	962,541
Pipeline and storage segment	120,955			111,972
Intersegment eliminations	(100,837		)	(86,327		)
Total operating revenues	1,219,409			988,186
Purchased gas cost
Distribution segment	727,053			513,096
Pipeline and storage segment	433			725
Intersegment eliminations	(100,526		)	(86,327		)
Total purchased gas cost	626,960			427,494
Operation and maintenance expense	161,073			132,239
Depreciation and amortization expense	89,381			77,667
Taxes, other than income	73,007			65,614
Operating income	268,988			285,172
Miscellaneous (expense) income	(253		)	833
Interest charges	27,304			26,944
Income from continuing operations before income taxes	241,431			259,061
Income tax expense	62,439			97,049
Income from continuing operations	178,992			162,012
Gain on sale of discontinued operations, net of tax ($0 and $10,215)	—			2,716
Net income	$	178,992		$	164,728
Basic and diluted net income per share
Income per share from continuing operations	$	1.60		$	1.52
Income per share from discontinued operations	—			0.03
Net income per share - basic and diluted	$	1.60		$	1.55
Cash dividends per share	$	0.485		$	0.450
Basic and diluted weighted average shares outstanding	111,706			105,935

See accompanying notes to condensed consolidated financial statements.

4

ATMOS ENERGY CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

	Six Months Ended   March 31
	2018			2017
	(Unaudited) (In thousands, except per share data)
Operating revenues
Distribution segment	$	2,060,083		$	1,717,197
Pipeline and storage segment	247,418			221,924
Intersegment eliminations	(198,900		)	(170,767		)
Total operating revenues	2,108,601			1,768,354
Purchased gas cost
Distribution segment	1,190,811			908,442
Pipeline and storage segment	1,345			1,080
Intersegment eliminations	(198,279		)	(170,723		)
Total purchased gas cost	993,877			738,799
Operation and maintenance expense	290,640			257,177
Depreciation and amortization expense	177,755			154,625
Taxes, other than income	135,780			122,663
Operating income	510,549			495,090
Miscellaneous expense	(2,288		)	(161		)
Interest charges	58,813			57,974
Income from continuing operations before income taxes	449,448			436,955
Income tax (benefit) expense	(43,676		)	160,905
Income from continuing operations	493,124			276,050
Income from discontinued operations, net of tax ($0 and $6,841)	—			10,994
Gain on sale of discontinued operations, net of tax ($0 and $10,215)	—			2,716
Net Income	$	493,124		$	289,760
Basic and diluted net income per share
Income per share from continuing operations	$	4.47		$	2.61
Income per share from discontinued operations	—			0.13
Net income per share - basic and diluted	$	4.47		$	2.74
Cash dividends per share	$	0.97		$	0.90
Basic and diluted weighted average shares outstanding	110,135			105,610

See accompanying notes to condensed consolidated financial statements.

5

ATMOS ENERGY CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Three Months Ended   March 31					Six Months Ended   March 31
	2018			2017		2018			2017
	(Unaudited) (In thousands)
Net income	$	178,992		$	164,728	$	493,124		$	289,760
Other comprehensive income (loss), net of tax
Net unrealized holding gains (losses) on available-for-sale securities, net of tax of $(276), $879, $(338) and $403	(939		)	1,530		(1,046		)	702
Cash flow hedges:
Amortization and unrealized gain on interest rate agreements, net of tax of $6,575, $2,432, $6,026 and $54,861	22,244			4,230		21,289			95,444
Net unrealized gains on commodity cash flow hedges, net of tax of $0, $0, $0 and $3,183	—			—		—			4,982
Total other comprehensive income	21,305			5,760		20,243			101,128
Total comprehensive income	$	200,297		$	170,488	$	513,367		$	390,888

See accompanying notes to condensed consolidated financial statements.

6

ATMOS ENERGY CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

	Six Months Ended   March 31
	2018			2017
	(Unaudited) (In thousands)
Cash Flows From Operating Activities
Net income	$	493,124		$	289,760
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	177,755			154,810
Deferred income taxes	116,023			148,657
One-time income tax benefit	(165,675		)	—
Gain on sale of discontinued operations	—			(12,931		)
Discontinued cash flow hedging for natural gas marketing commodity contracts	—			(10,579		)
Other	12,252			10,391
Net assets / liabilities from risk management activities	812			26,757
Net change in operating assets and liabilities	117,076			(54,862		)
Net cash provided by operating activities	751,367			552,003
Cash Flows From Investing Activities
Capital expenditures	(693,978		)	(559,385		)
Acquisition	—			(85,714		)
Proceeds from the sale of discontinued operations	3,000			133,560
Available-for-sale securities activities, net	(1,175		)	(8,918		)
Other, net	4,009			3,787
Net cash used in investing activities	(688,144		)	(516,670		)
Cash Flows From Financing Activities
Net decrease in short-term debt	(318,143		)	(159,204		)
Net proceeds from equity offering	395,092			49,400
Issuance of common stock through stock purchase and employee retirement plans	11,902			16,984
Proceeds from issuance of long-term debt	—			125,000
Interest rate agreements cash collateral	—			25,670
Cash dividends paid	(105,891		)	(95,314		)
Other	(1,518		)	—
Net cash used in financing activities	(18,558		)	(37,464		)
Net increase (decrease) in cash and cash equivalents	44,665			(2,131		)
Cash and cash equivalents at beginning of period	26,409			47,534
Cash and cash equivalents at end of period	$	71,074		$	45,403

See accompanying notes to condensed consolidated financial statements.

7

ATMOS ENERGY CORPORATION

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

March 31, 2018

1.    Nature of Business

Atmos Energy Corporation (“Atmos Energy” or the “Company”) is engaged in the regulated natural gas distribution and pipeline and storage businesses. Our distribution business is subject to federal and state regulation and/or regulation by local authorities in each of the states in which our regulated divisions and subsidiaries operate.

Our distribution business delivers natural gas through sales and transportation arrangements to over three million residential, commercial, public authority and industrial customers through our six regulated distribution divisions, which at March 31, 2018, covered service areas located in eight states.

Our pipeline and storage business, which is also subject to federal and state regulations, includes the transportation of natural gas to our Texas and Louisiana distribution systems and the management of our underground storage facilities used to support our distribution business in various states.

2.    Unaudited Financial Information

These consolidated interim-period financial statements have been prepared in accordance with accounting principles generally accepted in the United States on the same basis as those used for the Company’s audited consolidated financial statements included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. In the opinion of management, all material adjustments (consisting of normal recurring accruals) necessary for a fair presentation have been made to the unaudited consolidated interim-period financial statements. These consolidated interim-period financial statements are condensed as permitted by the instructions to Form 10-Q and should be read in conjunction with the audited consolidated financial statements of Atmos Energy Corporation included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. Because of seasonal and other factors, the results of operations for the six-month period ended March 31, 2018 are not indicative of our results of operations for the full 2018 fiscal year, which ends September 30, 2018.

Except for the filed formula rate mechanisms as discussed in Note 9, no events have occurred subsequent to the balance sheet date that would require recognition or disclosure in the condensed consolidated financial statements.

Significant accounting policies

Our accounting policies are described in Note 2 to the consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017.

During the second quarter of fiscal 2018, we completed our annual goodwill impairment assessment using a qualitative assessment, as permitted under U.S. GAAP. We test goodwill for impairment at the reporting unit level on an annual basis and between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of the reporting unit. Based on the assessment performed, we determined that our goodwill was not impaired.

In May 2014, the Financial Accounting Standards Board (FASB) issued a comprehensive new revenue recognition standard that will supersede virtually all existing revenue recognition guidance under generally accepted accounting principles in the United States. Under the new standard, an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies may need to use more judgment and make more estimates than under current guidance. The new guidance will become effective for us October 1, 2018 and can be applied either retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption.

As of March 31, 2018, we had substantially completed the evaluation of our sources of revenue and the impact that the new guidance will have on our financial position, results of operations, cash flows and business processes. Based on this evaluation, we currently do not believe the implementation of the new guidance will have a material effect on our financial position, results of operations, cash flows or business processes. We expect to apply the new guidance using the modified retrospective method on the date of adoption. We are currently still evaluating the impact on our financial statement presentation and related disclosures.

In January 2016, the FASB issued guidance related to the classification and measurement of financial instruments. The amendments modify the accounting and presentation for certain financial liabilities and equity investments not consolidated or reported using the equity method. The guidance is effective for us beginning October 1, 2018; limited early adoption is permitted. We are currently evaluating the potential impact of this new guidance on our financial position, results of operations and cash flows.

8

In February 2016, the FASB issued a comprehensive new leasing standard that will require lessees to recognize a lease liability and a right-of-use asset for all leases, including operating leases, with a term greater than 12 months on its balance sheet. The new standard will be effective for us beginning on October 1, 2019; early adoption is permitted. The new leasing standard requires modified retrospective transition, which requires application of the new guidance at the beginning of the earliest comparative period presented in the year of adoption. Additionally, in January 2018, the FASB issued amendments to the standard that provides a practical expedient for entities to not evaluate existing or expired land easements that were not previously accounted for as leases under the current guidance. We are currently evaluating the effect of this standard and amendments on our financial position, results of operations and cash flows.

In June 2016, the FASB issued new guidance which will require credit losses on most financial assets measured at amortized cost and certain other instruments to be measured using an expected credit loss model. Under this model, entities will estimate credit losses over the entire contractual term of the instrument from the date of initial recognition of that instrument. In contrast, current U.S. GAAP is based on an incurred loss model that delays recognition of credit losses until it is probable the loss has been incurred. The new guidance also introduces a new impairment recognition model for available-for-sale securities that will require credit losses for available-for-sale debt securities to be recorded through an allowance account. The new standard will be effective for us beginning on October 1, 2021; early adoption is permitted beginning on October 1, 2019. We are currently evaluating the potential impact of this new guidance on our financial position, results of operations and cash flows. 

In January 2017, the FASB issued new guidance that simplifies the accounting for goodwill impairments by eliminating step 2 from the goodwill impairment test. Under the new guidance, if the carrying amount of a reporting unit exceeds its fair value, an impairment loss will be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. The new standard will be effective for our fiscal 2021 goodwill impairment test; however, early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. We early adopted the new standard, effective for our goodwill impairment test performed in our second fiscal quarter of 2018. The new standard did not have a material impact on our results of operations, consolidated balance sheets or cash flows. 

In March 2017, the FASB issued new guidance related to the income statement presentation of the components of net periodic benefit cost for an entity’s sponsored defined benefit pension and other postretirement plans. The new guidance requires entities to disaggregate the current service cost component of the net benefit cost from the other components and present it with other current compensation costs for related employees in the statement of income. The other components of net benefit cost will be presented outside of income from operations on the statement of income. In addition, only the service cost component of net benefit cost is eligible for capitalization (e.g., as part of inventory or property, plant, and equipment). The Federal Energy Regulatory Commission (“FERC”), which regulates interstate transmission pipelines and also establishes, through its Uniform System of Accounts, accounting practices of rate-regulated entities, has issued guidance that states it will permit an election to either continue to capitalize non-service benefit costs or to cease capitalizing such costs for regulatory purposes.  Accounting guidelines by the FERC are typically also upheld by state commissions.  As such, we plan to continue to capitalize all components of net periodic benefit cost for ratemaking purposes and will defer the non-service cost components as a regulatory asset for U.S. GAAP reporting purposes. The new guidance will be effective for us in the fiscal year beginning on October 1, 2018 and for interim periods within that year.  The standard requires retrospective application of the amendment related to the presentation of non-service cost components outside of income from operations in the statement of income and prospective application of the change in eligible costs for capitalization. We do not anticipate the new standard will have a material impact on our financial position, results of operations and cash flows.

In February 2018, the FASB issued new guidance as a result of the Tax Cuts and Jobs Act of 2017 (the "TCJA"), related to the treatment of certain tax effects from accumulated other comprehensive income. The new guidance allows entities to reclassify from accumulated other comprehensive income to retained earnings the stranded tax effects resulting from the adoption of the TCJA. The new guidance will be effective for us in the fiscal year beginning on October 1, 2019 and for interim periods within that year. Early adoption is permitted, including adoption in any interim period for public business entities for reporting periods for which financial statements have not yet been issued and should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act is recognized. We are currently evaluating the impact of this new guidance on our financial results and disclosures.

Regulatory assets and liabilities

Accounting principles generally accepted in the United States require cost-based, rate-regulated entities that meet certain criteria to reflect the authorized recovery of costs due to regulatory decisions in their financial statements. As a result, certain costs are permitted to be capitalized rather than expensed because they can be recovered through rates. We record certain costs as regulatory assets when future recovery through customer rates is considered probable. Regulatory liabilities are recorded when it is probable that revenues will be reduced for amounts that will be credited to customers through the ratemaking process.

9

Substantially all of our regulatory assets are recorded as a component of deferred charges and other assets and a portion of our regulatory liabilities are recorded as a component of deferred credits and other liabilities. Deferred gas costs are recorded either in other current assets or liabilities and our regulatory excess deferred taxes and regulatory cost of removal obligation is reported separately.

Significant regulatory assets and liabilities as of March 31, 2018 and September 30, 2017 included the following:

	March 31, 2018		September 30, 2017
	(In thousands)
Regulatory assets:
Pension and postretirement benefit costs(1)	$	20,918	$	26,826
Infrastructure mechanisms(2)	65,286		46,437
Deferred gas costs	—		65,714
Recoverable loss on reacquired debt	9,954		11,208
Deferred pipeline record collection costs	14,646		11,692
APT annual adjustment mechanism	—		2,160
Rate case costs	3,016		2,629
Other	8,064		10,132
	$	121,884	$	176,798
Regulatory liabilities:
Regulatory excess deferred taxes(3)	$	737,798	$	—
Regulatory cost of service reserve(4)	29,042		—
Regulatory cost of removal obligation	526,483		521,330
Deferred gas costs	167,036		15,559
Asset retirement obligation	12,827		12,827
APT annual adjustment mechanism	5,081		—
Other	14,740		5,941
	$	1,493,007	$	555,657

(1) Includes $7.8 million and $9.4 million of pension and postretirement expense deferred pursuant to regulatory authorization.

(2) Infrastructure mechanisms in Texas and Louisiana allow for the deferral of all eligible expenses associated with capital expenditures incurred pursuant to these rules, including the recording of interest on deferred expenses until the next rate proceeding (rate case or annual rate filing), at which time investment and costs would be recoverable through base rates.

(3) The TCJA resulted in the remeasurement of the net deferred tax liability included in our rate base. The excess deferred taxes will be returned to utility customers in accordance with regulatory requirements. See Note 6 for further information.

(4) Effective January 1, 2018, regulators in each of our service areas required us to establish a regulatory liability for the difference in recoverable federal taxes included in revenues based on the former 35% federal statutory rate and the new 21% federal statutory rate for service provided on or after January 1, 2018. This liability will be returned to utility customers in accordance with regulatory requirements. See Note 6 for further information.

3.    Segment Information

 We manage and review our consolidated operations through the following reportable segments:

• The distribution segment is primarily comprised of our regulated natural gas distribution and related sales operations in eight states.

• The pipeline and storage segment is comprised primarily of the pipeline and storage operations of our Atmos Pipeline-Texas division and our natural gas transmission operations in Louisiana.

• Thenatural gas marketing segment was comprised of our discontinued natural gas marketing business.

Our determination of reportable segments considers the strategic operating units under which we manage sales of various products and services to customers in differing regulatory environments. Although our distribution segment operations are geographically dispersed, they are aggregated and reported as a single segment as each natural gas distribution division has similar economic characteristics. In addition, because the pipeline and storage operations of our Atmos Pipeline-Texas division and our natural gas transmission operations in Louisiana have similar economic characteristics, they have been aggregated and reported as a single segment.

10

The accounting policies of the segments are the same as those described in the summary of significant accounting policies found in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. We evaluate performance based on net income or loss of the respective operating units. We allocate interest and pension expense to the pipeline and storage segment; however, there is no debt or pension liability recorded on the pipeline and storage segment balance sheet. All material intercompany transactions have been eliminated; however, we have not eliminated intercompany profits when such amounts are probable of recovery under the affiliates’ rate regulation process. Income taxes are allocated to each segment as if each segment’s taxes were calculated on a separate return basis.

Income statements and capital expenditures for the three and six months endedMarch 31, 2018 and 2017 by segment are presented in the following tables:

	Three Months Ended March 31, 2018
	Distribution		Pipeline and Storage			Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	1,198,309	$	21,100		$	—		$	1,219,409
Intersegment revenues	982		99,855			(100,837		)	—
Total operating revenues	1,199,291		120,955			(100,837		)	1,219,409
Purchased gas cost	727,053		433			(100,526		)	626,960
Operation and maintenance expense	131,991		29,393			(311		)	161,073
Depreciation and amortization expense	65,649		23,732			—			89,381
Taxes, other than income	64,692		8,315			—			73,007
Operating income	209,906		59,082			—			268,988
Miscellaneous income (expense)	393		(646		)	—			(253		)
Interest charges	16,898		10,406			—			27,304
Income before income taxes	193,401		48,030			—			241,431
Income tax expense	48,158		14,281			—			62,439
Net income	$	145,243	$	33,749		$	—		$	178,992
Capital expenditures	$	224,235	$	86,505		$	—		$	310,740

11

	Three Months Ended March 31, 2017
	Distribution		Pipeline and Storage			Natural Gas Marketing		Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	962,217	$	25,969		$	—	$	—		$	988,186
Intersegment revenues	324		86,003			—		(86,327		)	—
Total operating revenues	962,541		111,972			—		(86,327		)	988,186
Purchased gas cost	513,096		725			—		(86,327		)	427,494
Operation and maintenance expense	103,703		28,536			—		—			132,239
Depreciation and amortization expense	61,302		16,365			—		—			77,667
Taxes, other than income	57,636		7,978			—		—			65,614
Operating income	226,804		58,368			—		—			285,172
Miscellaneous income (expense)	1,029		(196		)	—		—			833
Interest charges	16,925		10,019			—		—			26,944
Income from continuing operations before income taxes	210,908		48,153			—		—			259,061
Income tax expense	79,763		17,286			—		—			97,049
Income from continuing operations	131,145		30,867			—		—			162,012
Gain on sale of discontinued operations, net of tax	—		—			2,716		—			2,716
Net income	$	131,145	$	30,867		$	2,716	$	—		$	164,728
Capital expenditures	$	208,185	$	53,238		$	—	$	—		$	261,423

	Six Months Ended March 31, 2018
	Distribution			Pipeline and Storage			Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	2,058,762		$	49,839		$	—		$	2,108,601
Intersegment revenues	1,321			197,579			(198,900		)	—
Total operating revenues	2,060,083			247,418			(198,900		)	2,108,601
Purchased gas cost	1,190,811			1,345			(198,279		)	993,877
Operation and maintenance expense	235,728			55,533			(621		)	290,640
Depreciation and amortization expense	131,083			46,672			—			177,755
Taxes, other than income	119,799			15,981			—			135,780
Operating income	382,662			127,887			—			510,549
Miscellaneous expense	(1,007		)	(1,281		)	—			(2,288		)
Interest charges	38,266			20,547			—			58,813
Income before income taxes	343,389			106,059			—			449,448
Income tax (benefit) expense	(50,953		)	7,277			—			(43,676		)
Net income	$	394,342		$	98,782		$	—		$	493,124
Capital expenditures	$	465,484		$	228,494		$	—		$	693,978

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	Six Months Ended March 31, 2017
	Distribution		Pipeline and Storage			Natural Gas Marketing		Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	1,716,483	$	51,871		$	—	$	—		$	1,768,354
Intersegment revenues	714		170,053			—		(170,767		)	—
Total operating revenues	1,717,197		221,924			—		(170,767		)	1,768,354
Purchased gas cost	908,442		1,080			—		(170,723		)	738,799
Operation and maintenance expense	196,417		60,804			—		(44		)	257,177
Depreciation and amortization expense	122,459		32,166			—		—			154,625
Taxes, other than income	108,182		14,481			—		—			122,663
Operating income	381,697		113,393			—		—			495,090
Miscellaneous income (expense)	396		(557		)	—		—			(161		)
Interest charges	38,043		19,931			—		—			57,974
Income from continuing operations before income taxes	344,050		92,905			—		—			436,955
Income tax expense	127,541		33,364			—		—			160,905
Income from continuing operations	216,509		59,541			—		—			276,050
Income from discontinued operations, net of tax	—		—			10,994		—			10,994
Gain on sale of discontinued operations, net of tax	—		—			2,716		—			2,716
Net income	$	216,509	$	59,541		$	13,710	$	—		$	289,760
Capital expenditures	$	430,669	$	128,716		$	—	$	—		$	559,385

Balance sheet information at March 31, 2018 and September 30, 2017 by segment is presented in the following tables:

	March 31, 2018
	Distribution		Pipeline and Storage		Eliminations			Consolidated
	(In thousands)
Property, plant and equipment, net	$	7,202,673	$	2,558,656	$	—		$	9,761,329
Total assets	$	10,723,398	$	2,779,330	$	(2,146,406	)	$	11,356,322

	September 30, 2017
	Distribution		Pipeline and Storage		Eliminations			Consolidated
	(In thousands)
Property, plant and equipment, net	$	6,849,517	$	2,409,665	$	—		$	9,259,182
Total assets	$	10,050,164	$	2,621,601	$	(1,922,169	)	$	10,749,596

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4.    Earnings Per Share

We use the two-class method of computing earnings per share because we have participating securities in the form of non-vested restricted stock units with a nonforfeitable right to dividend equivalents, for which vesting is predicated solely on the passage of time. The calculation of earnings per share using the two-class method excludes income attributable to these participating securities from the numerator and excludes the dilutive impact of those shares from the denominator. Basic and diluted earnings per share for the three and six months ended March 31, 2018 and 2017 are calculated as follows:

	Three Months Ended   March 31				Six Months Ended   March 31
	2018		2017		2018		2017
	(In thousands, except per share amounts)
Basic and Diluted Earnings Per Share from continuing operations
Income from continuing operations	$	178,992	$	162,012	$	493,124	$	276,050
Less: Income from continuing operations allocated to participating securities	161		193		459		348
Income from continuing operations available to common shareholders	$	178,831	$	161,819	$	492,665	$	275,702
Basic and diluted weighted average shares outstanding	111,706		105,935		110,135		105,610
Income from continuing operations per share — Basic and Diluted	$	1.60	$	1.52	$	4.47	$	2.61
Basic and Diluted Earnings Per Share from discontinued operations
Income from discontinued operations	$	—	$	2,716	$	—	$	13,710
Less: Income from discontinued operations allocated to participating securities	—		2		—		15
Income from discontinued operations available to common shareholders	$	—	$	2,714	$	—	$	13,695
Basic and diluted weighted average shares outstanding	111,706		105,935		110,135		105,610
Income from discontinued operations per share — Basic and Diluted	$	—	$	0.03	$	—	$	0.13
Net income per share — Basic and Diluted	$	1.60	$	1.55	$	4.47	$	2.74

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5.    Debt

The nature and terms of our debt instruments and credit facilities are described in detail in Note 5 to the consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. There were no material changes in the terms of our debt instruments during the six months ended March 31, 2018.

Long-term debt at March 31, 2018 and September 30, 2017 consisted of the following:

	March 31, 2018			September 30, 2017
	(In thousands)
Unsecured 8.50% Senior Notes, due March 2019	$	450,000		$	450,000
Unsecured 3.00% Senior Notes, due 2027	500,000			500,000
Unsecured 5.95% Senior Notes, due 2034	200,000			200,000
Unsecured 5.50% Senior Notes, due 2041	400,000			400,000
Unsecured 4.15% Senior Notes, due 2043	500,000			500,000
Unsecured 4.125% Senior Notes, due 2044	750,000			750,000
Medium-term note Series A, 1995-1, 6.67%, due 2025	10,000			10,000
Unsecured 6.75% Debentures, due 2028	150,000			150,000
Floating-rate term loan, due September 2019(1)	125,000			125,000
Total long-term debt	3,085,000			3,085,000
Less:
Original issue premium / discount on unsecured senior notes and debentures	(4,412		)	(4,384		)
Debt issuance cost	21,520			22,339
Current maturities	450,000			—
	$	2,617,892		$	3,067,045

(1) Up to $200 million can be drawn under this term loan.

We utilize short-term debt to provide cost-effective, short-term financing until it can be replaced with a balance of long-term debt and equity financing that achieves the Company’s desired capital structure with an equity-to-total-capitalization ratio between 50% and 60%, inclusive of long-term and short-term debt. Our short-term borrowing requirements are affected primarily by the seasonal nature of the natural gas business. Changes in the price of natural gas and the amount of natural gas we need to supply our customers’ needs could significantly affect our borrowing requirements. Our short-term borrowings typically reach their highest levels in the winter months.

Currently, our short-term borrowing requirements are satisfied through a combination of a $1.5 billion commercial paper program and three committed revolving credit facilities with third-party lenders that provide approximately $1.5 billion of total working capital funding. The primary source of our funding is our commercial paper program, which is supported by a five-year unsecured $1.5 billion credit facility. On March 26, 2018, we executed one of our two one-year extension options which extended the maturity date from September 25, 2021 to September 25, 2022. The facility bears interest at a base rate or at a LIBOR-based rate for the applicable interest period, plus a spread ranging from zero percent to 1.25 percent, based on the Company’s credit ratings. Additionally, the facility contains a $250 million accordion feature, which provides the opportunity to increase the total committed loan to $1.75 billion. At March 31, 2018 and September 30, 2017, a total of $129.6 million and $447.7 million was outstanding under our commercial paper program.

Additionally, we have a $25 million 364-day unsecured facility, which was renewed effective April 1, 2018 and expires March 31, 2019, and a $10 million 364-day unsecured revolving credit facility, which is used primarily to issue letters of credit. At March 31, 2018, there were no borrowings outstanding under either of these facilities; however, outstanding letters of credit reduced the total amount available to us under our $10 million facility to $4.4 million.

The availability of funds under these credit facilities is subject to conditions specified in the respective credit agreements, all of which we currently satisfy. These conditions include our compliance with financial covenants and the continued accuracy of representations and warranties contained in these agreements. We are required by the financial covenants in each of these facilities to maintain, at the end of each fiscal quarter, a ratio of total-debt-to-total-capitalization of no greater than 70 percent. At March 31, 2018, our total-debt-to-total-capitalization ratio, as defined in the agreements, was 41 percent. In addition, both

15

the interest margin and the fee that we pay on unused amounts under certain of these facilities are subject to adjustment depending upon our credit ratings.

These credit facilities and our public indentures contain usual and customary covenants for our business, including covenants substantially limiting liens, substantial asset sales and mergers. Additionally, our public debt indentures relating to our senior notes and debentures, as well as certain of our revolving credit agreements, each contain a default provision that is triggered if outstanding indebtedness arising out of any other credit agreements in amounts ranging from in excess of $15 million to in excess of $100 million becomes due by acceleration or is not paid at maturity. We were in compliance with all of our debt covenants as of March 31, 2018. If we were unable to comply with our debt covenants, we would likely be required to repay our outstanding balances on demand, provide additional collateral or take other corrective actions.

6.    Impact of the Tax Cuts and Jobs Act of 2017

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the "TCJA") was signed into law. The TCJA introduced several significant changes to corporate income tax laws in the United States. The most significant change that affects Atmos Energy is the reduction of the federal statutory income tax rate from 35% to 21%. As a rate-regulated entity, the accelerated capital expensing and the limitation on interest deductibility provisions included in the TCJA are not applicable to us.

Under generally accepted accounting principles, we use the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled.

At September 30, 2017, we measured our net deferred tax liability using the enacted federal statutory tax rate of 35%. The enactment of the TCJA on December 22, 2017 required us to remeasure our deferred tax assets and liabilities, including our U.S. federal income tax net operating loss carryforwards, at the newly enacted federal statutory income tax rate. As the Company’s fiscal year end is September 30, the Internal Revenue Code requires the Company to use a blended statutory federal corporate income tax rate of 24.5% for fiscal 2018.

The decrease in the federal statutory income tax rate reduced our net deferred tax liability by $903.5 million. Of this amount, $737.8 million relates to regulated operations and has been recorded as a regulatory liability, which will be returned to utility customers. The period and timing of these revenue adjustments are subject to Internal Revenue Code provisions and regulatory actions in each of the eight states in which we operate. The remaining $165.7 million has been reflected as a one-time income tax benefit in our condensed consolidated statement of income for the six months ended March 31, 2018, because these taxes were not considered in our cost of service ratemaking. During the three months ended March 31, 2018, we refined the calculations performed to remeasure the Company's net deferred tax liabilities, which resulted in the recognition of a $3.8 million income tax benefit.

At March 31, 2018, we had $274.7 million of remeasured federal net operating loss carryforwards. The federal net operating loss carryforwards are available to offset future taxable income and will begin to expire in 2029. The Company also has $10.1 million of federal alternative minimum tax credit carryforwards that do not expire and are expected to be fully refunded to us between 2019 and 2022 as a result of changes introduced by the TCJA. These credit carryforwards are now reflected as taxes receivable within the deferred charges and other assets line item on our condensed consolidated balance sheet. In addition, the Company has $5.2 million in remeasured charitable contribution carryforwards to offset future taxable income. The Company’s charitable contribution carryforwards expire between 2018 and 2023.

The Company also has $21.5 million of state net operating loss carryforwards and $1.5 million of state tax credit carryforwards (net of $5.7 million and $0.4 million of remeasured federal effects). Depending on the jurisdiction in which the state net operating loss was generated, the carryforwards will begin to expire between 2018 and 2032.

Due to the changes introduced by the TCJA, we now believe it is more likely than not that the benefit from certain charitable contribution carryforwards for which a valuation allowance was previously established will be realized. As a result, we reduced our valuation allowance by $4.2 million during the first quarter. This amount is included in the $165.7 million one-time income tax benefit.

The SEC issued guidance in Staff Accounting Bulletin 118 (SAB 118), which allows us to record provisional amounts during a one-year measurement period, similar to the measurement period in accounting for business combinations. The Company has determined a reasonable estimate for the measurement and accounting for certain effects of the TCJA, including the remeasurement of our net deferred tax liabilities and the establishment of a regulatory liability, which have been reflected as provisional amounts in the March 31, 2018 condensed consolidated financial statements and are described in further detail above. The amounts represent our best estimates based upon records, information and current guidance. We are still analyzing certain aspects of the TCJA, refining our calculations and expecting additional guidance relating to the TCJA from the U.S.

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Department of the Treasury and the Internal Revenue Service.  Any additional guidance issued or future actions of our regulators could potentially affect the final determination of the accounting effects arising from the implementation of the TCJA.

We are actively working with our regulators in each jurisdiction to address the impact of the TCJA on our cost of service based rates. Accounting orders have been issued for all our service areas that required us to establish, effective January 1, 2018, a separate regulatory liability for the difference in taxes included in our rates that have been calculated based on a 35% statutory income tax rate and the new 21% statutory income tax rate. The establishment of this regulatory liability relating to our cost of service rates resulted in a reduction to our revenues beginning in the second quarter of fiscal 2018. The period and timing of the return of these liabilities to utility customers will be determined by regulators in each of our jurisdictions.

During the fiscal 2018 second quarter, we received approval from regulators to update our cost of service rates to reflect the decrease in the statutory income tax rate in our Colorado, Kansas, Kentucky and Texas service areas. The return to customers of regulatory liabilities recorded for differences in our cost of service rates due to the change in the federal statutory income tax rate and the excess deferred taxes created upon implementation of the TCJA will be addressed in future regulatory proceedings. We are still working with regulators in Louisiana, Mississippi, Tennessee and Virginia to reflect the effects of the TCJA in our cost of service in rates.

7.    Shareholders' Equity

Shelf Registration, At-the-Market Equity Sales Program and Equity Issuance

On March 28, 2016, we filed a registration statement with the Securities and Exchange Commission (SEC) that originally permitted us to issue, from time to time, up to $2.5 billion in common stock and/or debt securities, which expires March 28, 2019. At March 31, 2018, approximately $1.2 billion of securities remained available for issuance under the shelf registration statement.

On November 14, 2017, we filed a prospectus supplement under the registration statement relating to an at-the-market (ATM) equity sales program under which we may issue and sell shares of our common stock up to an aggregate offering price of $500 million, which expires March 28, 2019. During the six months ended March 31, 2018, no shares of common stock were sold under the ATM program.

On November 30, 2017, we filed a prospectus supplement under the registration statement relating to an underwriting agreement to sell 4,558,404 shares of our common stock. We received aggregate gross proceeds of $400 million and received net proceeds, after expenses, of $395.1 million from the offering.

Accumulated Other Comprehensive Income (Loss)

We record deferred gains (losses) in AOCI related to available-for-sale securities, interest rate cash flow hedges and prior to the sale of Atmos Energy Marketing, LLC (AEM) on January 3, 2017, commodity contract cash flow hedges. Deferred gains (losses) for our available-for-sale securities and commodity contract cash flow hedges are recognized in earnings upon settlement, while deferred gains (losses) related to our interest rate agreement cash flow hedges are recognized in earnings as they are amortized. The following tables provide the components of our accumulated other comprehensive income (loss) balances, net of the related tax effects allocated to each component of other comprehensive income (loss):

	Available- for-Sale Securities			Interest Rate Agreement Cash Flow Hedges			Total
	(In thousands)
September 30, 2017	$	7,048		$	(112,302	)	$	(105,254	)
Other comprehensive income (loss) before reclassifications	(167		)	20,454			20,287
Amounts reclassified from accumulated other comprehensive income	(879		)	835			(44		)
Net current-period other comprehensive income (loss)	(1,046		)	21,289			20,243
March 31, 2018	$	6,002		$	(91,013	)	$	(85,011	)

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	Available- for-Sale Securities		Interest Rate Agreement Cash Flow Hedges			Commodity Contracts Cash Flow Hedges			Total
	(In thousands)
September 30, 2016	$	4,484	$	(187,524	)	$	(4,982	)	$	(188,022	)
Other comprehensive income before reclassifications	634		95,271			9,847			105,752
Amounts reclassified from accumulated other comprehensive income	68		173			(4,865		)	(4,624		)
Net current-period other comprehensive income	702		95,444			4,982			101,128
March 31, 2017	$	5,186	$	(92,080	)	$	—		$	(86,894	)

The following tables detail reclassifications out of AOCI for the three and six months ended March 31, 2018 and 2017. Amounts in parentheses below indicate decreases to net income in the statement of income:

	Three Months Ended March 31, 2018
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement of Income
	(In thousands)
Available-for-sale securities	$	1,139		Operation and maintenance expense
	1,139			Total before tax
	(260		)	Tax expense
	$	879		Net of tax
Cash flow hedges
Interest rate agreements	$	(593	)	Interest charges
	(593		)	Total before tax
	135			Tax benefit
	$	(458	)	Net of tax
Total reclassifications	$	421		Net of tax

	Three Months Ended March 31, 2017
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement of Income
	(In thousands)
Available-for-sale securities	$	(107	)	Operation and maintenance expense
	(107		)	Total before tax
	39			Tax benefit
	$	(68	)	Net of tax
Cash flow hedges
Interest rate agreements	$	(136	)	Interest charges
	(136		)	Total before tax
	50			Tax benefit
	$	(86	)	Net of tax
Total reclassifications	$	(154	)	Net of tax

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	Six Months Ended March 31, 2018
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in  the Statement of Income
	(In thousands)
Available-for-sale securities	$	1,139		Operation and maintenance expense
	1,139			Total before tax
	(260		)	Tax expense
	$	879		Net of tax
Cash flow hedges
Interest rate agreements	$	(1,187	)	Interest charges
	(1,187		)	Total before tax
	352			Tax benefit
	$	(835	)	Net of tax
Total reclassifications	$	44		Net of tax

	Six Months Ended March 31, 2017
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in  the Statement of Income
	(In thousands)
Available-for-sale securities	$	(107	)	Operation and maintenance expense
	(107		)	Total before tax
	39			Tax benefit
	$	(68	)	Net of tax
Cash flow hedges
Interest rate agreements	$	(273	)	Interest charges
Commodity contracts	7,967			Purchased gas cost(1)
	7,694			Total before tax
	(3,002		)	Tax expense
	$	4,692		Net of tax
Total reclassifications	$	4,624		Net of tax

(1) Amount is presented as part of income from discontinued operations in the condensed consolidated statement of income.

8.     Interim Pension and Other Postretirement Benefit Plan Information

The components of our net periodic pension cost for our pension and other postretirement benefit plans for the three and six months endedMarch 31, 2018 and 2017 are presented in the following tables. Most of these costs are recoverable through our tariff rates; however, a portion of these costs is capitalized into our rate base. The remaining costs are recorded as a component of operation and maintenance expense. In the second quarter of fiscal 2018, due to the retirement of certain executives, we recognized a settlement loss of $2.4 million associated with our Supplemental Executive Retirement Plan and revalued the net periodic pension cost for the remainder of fiscal 2018. The revaluation of the net periodic pension cost for our Supplemental Executive Retirement Plan resulted in an increase in the discount rate, effective March 1, 2018, to 4.12%, which will increase our net periodic pension cost by approximately $0.1 million for the remainder of the fiscal year.

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	Three Months Ended March 31
	Pension Benefits						Other Benefits
	2018			2017			2018			2017
	(In thousands)
Components of net periodic pension cost:
Service cost	$	4,575		$	5,217		$	3,019		$	3,109
Interest cost	6,433			6,297			2,727			2,670
Expected return on assets	(6,916		)	(6,994		)	(2,001		)	(1,797		)
Amortization of prior service cost (credit)	(58		)	(58		)	3			(411		)
Amortization of actuarial (gain) loss	3,085			4,249			(1,619		)	(707		)
Settlements	2,415			—			—			—
Net periodic pension cost	$	9,534		$	8,711		$	2,129		$	2,864

	Six Months Ended March 31
	Pension Benefits						Other Benefits
	2018			2017			2018			2017
	(In thousands)
Components of net periodic pension cost:
Service cost	$	9,135		$	10,433		$	6,039		$	6,218
Interest cost	12,863			12,594			5,454			5,340
Expected return on assets	(13,833		)	(13,988		)	(4,003		)	(3,593		)
Amortization of prior service cost (credit)	(116		)	(116		)	6			(822		)
Amortization of actuarial (gain) loss	6,174			8,498			(3,237		)	(1,414		)
Settlements	2,415			—			—			—
Net periodic pension cost	$	16,638		$	17,421		$	4,259		$	5,729

The assumptions used to develop our net periodic pension cost for the three and six months endedMarch 31, 2018 and 2017 are as follows:

	Supplemental Executive Retirement Plan		Pension Benefits		Other Benefits
	2018	2017	2018	2017	2018	2017
Discount rate	4.12%	3.73%	3.89%	3.73%	3.89%	3.73%
Rate of compensation increase	3.50%	3.50%	3.50%	3.50%	N/A	N/A
Expected return on plan assets	N/A	N/A	6.75%	7.00%	4.29%	4.45%

The discount rate used to compute the present value of a plan’s liabilities generally is based on rates of high-grade corporate bonds with maturities similar to the average period over which the benefits will be paid. Generally, our funding policy has been to contribute annually an amount in accordance with the requirements of the Employee Retirement Income Security Act of 1974. In accordance with the Pension Protection Act of 2006 (PPA), we determined the funded status of our plan as of January 1, 2017. Based on that determination, we are not required to make a minimum contribution to our defined benefit plan during fiscal 2018; however, we may consider whether a voluntary contribution is prudent to maintain certain funding levels.

We contributed $7.5 million to our other post-retirement benefit plans during the six months ended March 31, 2018. We expect to contribute a total of between $10 million and $20 million to these plans during fiscal 2018.

9.    Commitments and Contingencies

Litigation and Environmental Matters

In the normal course of business, we are subject to various legal and regulatory proceedings. For such matters, we record liabilities when they are considered probable and estimable, based on currently available facts, our historical experience, and our estimates of the ultimate outcome or resolution of the liability in the future. While the outcome of these proceedings is uncertain and a loss in excess of the amount we have accrued is possible though not reasonably estimable, it is the opinion of management that any amounts exceeding the accruals will not have a material adverse impact on our financial position, results of operations, or cash flows.

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We maintain liability insurance for various risks associated with the operation of our natural gas pipelines and facilities, including for property damage and bodily injury. These liability insurance policies generally require us to be responsible for the first $1.0 million (self-insured retention) of each incident.

The National Transportation Safety Board (NTSB) is investigating an incident that occurred at a Dallas, Texas residence on February 23, 2018 that resulted in one fatality and injuries to four other residents. Together with the Railroad Commission of Texas and the Pipeline and Hazardous Materials Safety Administration, Atmos Energy is a party to the investigation and in that capacity is working closely with the NTSB to help determine the cause of this incident.

On March 29, 2018, a civil action was filed in Dallas, Texas against Atmos Energy in response to the February 23rd incident. The plaintiffs seek over $1.0 million in damages for, among with others, wrongful death and personal injury.

We are a party to various other litigation and environmental-related matters or claims that have arisen in the ordinary course of our business. While the results of such litigation and response actions to such environmental-related matters or claims cannot be predicted with certainty, we continue to believe the final outcome of such litigation and matters or claims will not have a material adverse effect on our financial condition, results of operations or cash flows.

Purchase Commitments

Our distribution divisions maintain supply contracts with several vendors that generally cover a period of up to one year. Commitments for estimated base gas volumes are established under these contracts on a monthly basis at contractually negotiated prices. Commitments for incremental daily purchases are made as necessary during the month in accordance with the terms of the individual contract.

Our Mid-Tex Division also maintains a limited number of long-term supply contracts to ensure a reliable source of gas for our customers in its service area, which obligate it to purchase specified volumes at prices indexed to natural gas hubs. At March 31, 2018, we were committed to purchase 55.0 Bcf within one year and 64.7 Bcf within two to three years under indexed contracts.

Regulatory Matters

Various regulatory agencies, including the SEC and the Commodities Futures Trading Commission, continue to adopt regulations implementing many of the provisions of the Dodd-Frank Act of 2010. We continue to enact new procedures and modify existing business practices and contractual arrangements to comply with such regulations.  Additional rulemakings are pending which we believe will result in new reporting and disclosure obligations. The costs associated with hedging certain risks inherent in our business may be further increased when these expected additional regulations are adopted.

As of March 31, 2018, formula rate mechanisms were pending regulatory approval in our Louisiana and Tennessee service areas, infrastructure mechanisms were pending regulatory approval in our Mid-Tex, Mississippi and West Texas service areas as well as the Atmos Pipeline–Texas Division and rate cases were pending regulatory approval in our Colorado and Kentucky service areas. These regulatory proceedings are discussed in further detail below in Management’s Discussion and Analysis — Recent Ratemaking Developments. On April 3, 2018, we filed formula rate mechanisms in our Mid-Tex and West Texas service areas, seeking increases in operating income. Additionally, as discussed in further detail in Note 6, all jurisdictions are addressing impacts of the TCJA.

10.    Financial Instruments

We currently use financial instruments to mitigate commodity price risk and interest rate risk. The objectives and strategies for using financial instruments and the related accounting for these financial instruments are fully described in Notes 2 and 13 to the consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. During the six months ended March 31, 2018, there were no material changes in our objectives, strategies and accounting for using financial instruments. Our financial instruments do not contain any credit-risk-related or other contingent features that could cause payments to be accelerated when our financial instruments are in net liability positions. The following summarizes those objectives and strategies.

Commodity Risk Management Activities

Our purchased gas cost adjustment mechanisms essentially insulate our distribution segment from commodity price risk; however, our customers are exposed to the effects of volatile natural gas prices. We manage this exposure through a combination of physical storage, fixed-price forward contracts and financial instruments, primarily over-the-counter swap and option contracts, in an effort to minimize the impact of natural gas price volatility on our customers during the winter heating season.

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We typically seek to hedge between 25 and 50 percent of anticipated heating season gas purchases using financial instruments. For the 2017-2018 heating season (generally October through March), in the jurisdictions where we are permitted to utilize financial instruments, we hedged approximately 26 percent, or 15.0 Bcf of the winter flowing gas requirements. We have not designated these financial instruments as hedges for accounting purposes.

Interest Rate Risk Management Activities

We periodically manage interest rate risk by entering into financial instruments to effectively fix the Treasury yield component of the interest cost associated with anticipated financings.

As of March 31, 2018, we had forward starting interest rate swaps to effectively fix the Treasury yield component associated with the anticipated issuance of $450 million unsecured senior notes in fiscal 2019 at 3.78%, which we designated as a cash flow hedge at the time the swaps were executed. As of March 31, 2018, we had $49.1 million of net realized losses in accumulated other comprehensive income (AOCI) associated with the settlement of financial instruments used to fix the Treasury yield component of the interest cost of financing various issuances of long-term debt and senior notes, which will be recognized as a component of interest expense over the life of the associated notes from the date of settlement. The remaining amortization periods for these settled amounts extend through fiscal 2045.

Quantitative Disclosures Related to Financial Instruments

The following tables present detailed information concerning the impact of financial instruments on our condensed consolidated balance sheet and income statements.

As of March 31, 2018, our financial instruments were comprised of both long and short commodity positions. A long position is a contract to purchase the commodity, while a short position is a contract to sell the commodity. As of March 31, 2018, we had 6,251 MMcf of net short commodity contracts outstanding. These contracts have not been designated as hedges.

Financial Instruments on the Balance Sheet

The following tables present the fair value and balance sheet classification of our financial instruments as of March 31, 2018 and September 30, 2017. The gross amounts of recognized assets and liabilities are netted within our unaudited Condensed Consolidated Balance Sheets to the extent that we have netting arrangements with our counterparties.

	Balance Sheet Location	Assets		Liabilities
		(In thousands)
March 31, 2018
Designated As Hedges:
Interest rate contracts	Other current assets / Other current liabilities	$	—	$	(85,948	)
Total		—		(85,948		)
Not Designated As Hedges:
Commodity contracts	Other current assets / Other current liabilities	602		(996		)
Total		602		(996		)
Gross Financial Instruments		602		(86,944		)
Gross Amounts Offset on Consolidated Balance Sheet:
Contract netting		—		—
Net Financial Instruments		602		(86,944		)
Cash collateral		—		—
Net Assets/Liabilities from Risk Management Activities		$	602	$	(86,944	)

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	Balance Sheet Location	Assets		Liabilities
		(In thousands)
September 30, 2017
Designated As Hedges:
Interest rate contracts	Deferred charges and other assets / Deferred credits and other liabilities	$	—	$	(112,076	)
Total		—		(112,076		)
Not Designated As Hedges:
Commodity contracts	Other current assets / Other current liabilities	2,436		(322		)
Commodity contracts	Deferred charges and other assets / Deferred credits and other liabilities	803		—
Total		3,239		(322		)
Gross Financial Instruments		3,239		(112,398		)
Gross Amounts Offset on Consolidated Balance Sheet:
Contract netting		—		—
Net Financial Instruments		3,239		(112,398		)
Cash collateral		—		—
Net Assets/Liabilities from Risk Management Activities		$	3,239	$	(112,398	)

Impact of Financial Instruments on the Income Statement

Cash Flow Hedges

As discussed above, our distribution segment has interest rate swap agreements, which we designated as a cash flow hedge at the time the swaps were executed. The net loss on settled interest rate agreements reclassified from AOCI into interest charges on our condensed consolidated statements of income for the three months ended March 31, 2018 and 2017 was $0.6 million and $0.1 million and for the six months ended March 31, 2018 and 2017 was $1.2 million and $0.3 million.

The following table summarizes the gains and losses arising from hedging transactions that were recognized as a component of other comprehensive income (loss), net of taxes, for the three and six months ended March 31, 2018 and 2017. The amounts included in the table below exclude gains and losses arising from ineffectiveness because those amounts are immediately recognized in the income statement as incurred.

	Three Months Ended   March 31				Six Months Ended   March 31
	2018		2017 (1)		2018		2017 (1)
	(In thousands)
Increase in fair value:
Interest rate agreements	$	21,786	$	4,144	$	20,454	$	95,271
Forward commodity contracts(2)	—		—		—		9,847
Recognition of (gains) losses in earnings due to settlements:
Interest rate agreements	458		86		835		173
Forward commodity contracts(2)	—		—		—		(4,865		)
Total other comprehensive income from hedging, net of tax	$	22,244	$	4,230	$	21,289	$	100,426

(1) Utilizing an income tax rate ranging from 37 percent to 39 percent based on the effective rates in each taxing jurisdiction for the three and six-month period ended March 31, 2017.

(2) Due to the sale of AEM, these amounts are included in income from discontinued operations.

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Deferred gains (losses) recorded in AOCI associated with our interest rate agreements are recognized in earnings as they are amortized over the terms of the underlying debt instruments. The following amounts, net of deferred taxes, represent the expected recognition in earnings, as of March 31, 2018, of the deferred losses recorded in AOCI associated with our financial instruments, based upon the fair values of these financial instruments at the date of settlement. However, the table below does not include the expected recognition in earnings of our outstanding interest rate agreements as those instruments have not yet settled.

	Interest Rate Agreements
	(In thousands)
Next twelve months	$	(1,833	)
Thereafter	(47,281		)
Total	$	(49,114	)

Financial Instruments Not Designated as Hedges

As discussed above, financial instruments used in our distribution segment are not designated as hedges. However, there is no earnings impact on our distribution segment as a result of the use of these financial instruments because the gains and losses arising from the use of these financial instruments are recognized in the consolidated statement of income as a component of purchased gas cost when the related costs are recovered through our rates and recognized in revenue. Accordingly, the impact of these financial instruments is excluded from this presentation.

11.    Fair Value Measurements

We report certain assets and liabilities at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). We record cash and cash equivalents, accounts receivable and accounts payable at carrying value, which substantially approximates fair value due to the short-term nature of these assets and liabilities. For other financial assets and liabilities, we primarily use quoted market prices and other observable market pricing information to minimize the use of unobservable pricing inputs in our measurements when determining fair value. The methods used to determine fair value for our assets and liabilities are fully described in Note 2 to the financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. During the six months ended March 31, 2018, there were no changes in these methods.

Fair value measurements also apply to the valuation of our pension and postretirement plan assets. Current accounting guidance requires employers to annually disclose information about fair value measurements of the assets of a defined benefit pension or other postretirement plan. The fair value of these assets is presented in Note 7 to the financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017.

Quantitative Disclosures

Financial Instruments

The classification of our fair value measurements requires judgment regarding the degree to which market data is observable or corroborated by observable market data. Authoritative accounting literature establishes a fair value hierarchy that prioritizes the inputs used to measure fair value based on observable and unobservable data. The hierarchy categorizes the inputs into three levels, with the highest priority given to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1), with the lowest priority given to unobservable inputs (Level 3). The following tables summarize, by level within the fair value hierarchy, our assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2018 and September 30, 2017. Assets and liabilities are categorized in their entirety based on the lowest level of input that is significant to the fair value measurement.

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	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)(1)		Significant Other Unobservable Inputs (Level 3)		Netting and Cash Collateral		March 31, 2018
	(In thousands)
Assets:
Financial instruments	$	—	$	602	$	—	$	—	$	602
Available-for-sale securities
Registered investment companies	39,783		—		—		—		39,783
Bond mutual funds	16,308		—		—		—		16,308
Bonds	—		31,137		—		—		31,137
Money market funds	—		6,437		—		—		6,437
Total available-for-sale securities	56,091		37,574		—		—		93,665
Total assets	$	56,091	$	38,176	$	—	$	—	$	94,267
Liabilities:
Financial instruments	$	—	$	86,944	$	—	$	—	$	86,944

	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)(1)		Significant Other Unobservable Inputs (Level 3)		Netting and Cash Collateral		September 30, 2017
	(In thousands)
Assets:
Financial instruments	$	—	$	3,239	$	—	$	—	$	3,239
Available-for-sale securities
Registered investment companies	41,097		—		—		—		41,097
Bond mutual funds	16,371		—		—		—		16,371
Bonds	—		29,104		—		—		29,104
Money market funds	—		1,837		—		—		1,837
Total available-for-sale securities	57,468		30,941		—		—		88,409
Total assets	$	57,468	$	34,180	$	—	$	—	$	91,648
Liabilities:
Financial instruments	$	—	$	112,398	$	—	$	—	$	112,398

(1) Our Level 2 measurements consist of over-the-counter options and swaps which are valued using a market-based approach in which observable market prices are adjusted for criteria specific to each instrument, such as the strike price, notional amount or basis differences, municipal and corporate bonds which are valued based on the most recent available quoted market prices and money market funds which are valued at cost.

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Available-for-sale securities are comprised of the following:

	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
	(In thousands)
As of March 31, 2018
Domestic equity mutual funds	$	25,515	$	8,194	$	(95	)	$	33,614
Foreign equity mutual funds	4,138		2,031		—			6,169
Bond mutual funds	16,548		—		(240		)	16,308
Bonds	31,295		4		(162		)	31,137
Money market funds	6,437		—		—			6,437
	$	83,933	$	10,229	$	(497	)	$	93,665
As of September 30, 2017
Domestic equity mutual funds	$	25,361	$	8,920	$	—		$	34,281
Foreign equity mutual funds	4,581		2,235		—			6,816
Bond mutual funds	16,391		2		(22		)	16,371
Bonds	29,074		46		(16		)	29,104
Money market funds	1,837		—		—			1,837
	$	77,244	$	11,203	$	(38	)	$	88,409

At March 31, 2018 and September 30, 2017, our available-for-sale securities included $46.2 million and $42.9 million related to assets held in separate rabbi trusts for our supplemental executive benefit plans. At March 31, 2018, we maintained investments in bonds that have contractual maturity dates ranging from April 2018 through January 2021.

These securities are reported at market value with unrealized gains and losses shown as a component of accumulated other comprehensive income (loss). We regularly evaluate the performance of these investments on a fund by fund basis for impairment, taking into consideration the fund’s purpose, volatility and current returns. If a determination is made that a decline in fair value is other than temporary, the related fund is written down to its estimated fair value and the other-than-temporary impairment is recognized in the income statement.

Other Fair Value Measures

Our debt is recorded at carrying value. The fair value of our debt is determined using third party market value quotations, which are considered Level 1 fair value measurements for debt instruments with a recent, observable trade or Level 2 fair value measurements for debt instruments where fair value is determined using the most recent available quoted market price. The following table presents the carrying value and fair value of our debt as of March 31, 2018 and September 30, 2017:

	March 31, 2018		September 30, 2017
	(In thousands)
Carrying Amount	$	3,085,000	$	3,085,000
Fair Value	$	3,291,629	$	3,382,272

12.    Concentration of Credit Risk

Information regarding our concentration of credit risk is disclosed in Note 16 to the financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. During the six months ended March 31, 2018, there were no material changes in our concentration of credit risk.

13. Discontinued Operations

On October 29, 2016, we entered into a Membership Interest Purchase Agreement (the Agreement) with CenterPoint Energy Services, Inc., a subsidiary of CenterPoint Energy, Inc. (CES) to sell all of the equity interests of Atmos Energy Marketing, LLC (AEM). The transaction closed on January 3, 2017, with an effective date of January 1, 2017. CES paid a cash purchase price of $38.3 million plus working capital of $109.0 million for total cash consideration of $147.3 million. Of

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this amount, $7.0 million was placed into escrow and was to be paid to the Company within 24 months of the closing date, net of any indemnification claims agreed upon between the two companies. In January 2018, $3.0 million of this escrowed amount was released and received by the Company. We recognized a net gain of $0.03 per diluted share on the sale in the second quarter of fiscal 2017 and completed the working capital true–up during the third quarter of fiscal 2017.

The operating results of our natural gas marketing reportable segment have been reported on the condensed consolidated statement of income as income from discontinued operations, net of income tax, for the six months ended March 31, 2017.  Accordingly, expenses related to allocable general corporate overhead and interest expense are not included in these results. 

The tables below set forth selected financial information related to discontinued operations. Operating expenses include operation and maintenance expense, provision for doubtful accounts, depreciation and amortization expense and taxes, other than income. At March 31, 2018 and September 30, 2017 we did not have any assets or liabilities held for sale. As AEM was sold effective January 1, 2017, no operating results are reported on the condensed consolidated statement of income as discontinued operations for the three months ended March 31, 2017. During the three months ended March 31, 2017, we recorded a gain on sale from discontinued operations for $2.7 million, net of tax of $10.2 million.

The following table presents statement of income data related to discontinued operations:

	Six Months Ended   March 31, 2017
	(In thousands)
Operating revenues	$	303,474
Purchased gas cost	277,554
Operating expenses	7,874
Operating income	18,046
Other nonoperating expense	(211		)
Income from discontinued operations before income taxes	17,835
Income tax expense	6,841
Income from discontinued operations	10,994
Gain on sale from discontinued operations, net of tax ($10,215)	2,716
Net income from discontinued operations	$	13,710

The following table presents statement of cash flow data related to discontinued operations:

	Six Months Ended   March 31, 2017
	(In thousands)
Depreciation and amortization expense	$	185
Capital expenditures	$	—
Non-cash loss in commodity contract cash flow hedges	$	(8,165	)

Natural Gas Marketing Commodity Risk Management Activities

Our discontinued natural gas marketing segment was exposed to risks associated with changes in the market price of natural gas through the purchase, sale and delivery of natural gas to its customers at competitive prices. Through December 31, 2016, we managed our exposure to such risks through a combination of physical storage and financial instruments, including futures, over-the-counter and exchange-traded options and swap contracts with counterparties. Effective January 1, 2017, as a result of the sale of AEM, these activities were discontinued.

Due to the sale of AEM, we determined that the cash flows associated with our natural gas marketing commodity cash flow hedges were no longer probable of occurring; therefore, we discontinued hedge accounting as of December 31, 2016. As a result, we reclassified the gain in accumulated other comprehensive income associated with the commodity contracts into earnings as a reduction of purchased gas cost and recognized a pre-tax gain of $10.6 million, which is included in income from discontinued operations on the condensed consolidated statement of income for the six months ended March 31, 2017.

The Company's other risk management activities are discussed in Note 10.

Impact of Financial Instruments on the Income Statement

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Hedge ineffectiveness for our natural gas marketing segment was recorded as a component of purchased gas cost, which is included in discontinued operations on the condensed consolidated statements of income, and primarily results from differences in the location and timing of the derivative instrument and the hedged item. For the six months endedMarch 31, 2017, we recognized a gain arising from fair value and cash flow hedge ineffectiveness of $3.4 million. Additional information regarding ineffectiveness recognized in the income statement is included in the tables below.

Fair Value Hedges

The impact of our natural gas marketing segment commodity contracts designated as fair value hedges and the related hedged item on the results of discontinued operations on our condensed consolidated income statement for the six months endedMarch 31, 2017 is presented below.

	Six Months Ended   March 31, 2017
	(In thousands)
Commodity contracts	$	(9,567	)
Fair value adjustment for natural gas inventory designated as the hedged item	12,858
Total decrease in purchased gas cost reflected in income from discontinued operations	$	3,291
The decrease in purchased gas cost reflected in income from discontinued operations is comprised of the following:
Basis ineffectiveness	$	(597	)
Timing ineffectiveness	3,888
	$	3,291

Basis ineffectiveness arises from natural gas market price differences between the locations of the hedged inventory and the delivery location specified in the hedge instruments. Timing ineffectiveness arises due to changes in the difference between the spot price and the futures price, as well as the difference between the timing of the settlement of the futures and the valuation of the underlying physical commodity.

Cash Flow Hedges

The impact of our natural gas marketing segment cash flow hedges on our condensed consolidated income statements for the six months endedMarch 31, 2017 is presented below:

	Six Months Ended   March 31, 2017
	(In thousands)
Loss reclassified from AOCI for effective portion of natural gas marketing commodity contracts	$	(2,612	)
Gain arising from ineffective portion of natural gas marketing commodity contracts	111
Gain on discontinuance of cash flow hedging of natural gas marketing commodity contracts reclassified from AOCI	10,579
Total impact on purchased gas cost reflected in income from discontinued operations	$	8,078

Financial Instruments Not Designated as Hedges

The impact of the natural gas marketing segment's financial instruments that had not been designated as hedges on our condensed consolidated income statements for the six months endedMarch 31, 2017 was a decrease in purchased gas cost of $6.8 million, which is included in discontinued operations on the condensed consolidated statements of income.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Shareholders of

Atmos Energy Corporation

We have reviewed the condensed consolidated balance sheet of Atmos Energy Corporation as of March 31, 2018 and the related condensed consolidated statements of income and comprehensive income for the three and six month periods ended March 31, 2018 and 2017 and the condensed consolidated statements of cash flows for the six month periods ended March 31, 2018 and 2017. These financial statements are the responsibility of the Company’s management.

We conducted our review in accordance with the standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board, the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our review, we are not aware of any material modifications that should be made to the condensed consolidated financial statements referred to above for them to be in conformity with U.S. generally accepted accounting principles.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of Atmos Energy Corporation as of September 30, 2017, and the related consolidated statements of income, comprehensive income, shareholders’ equity, and cash flows for the year then ended, not presented herein, and in our report dated November 13, 2017, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of September 30, 2017, is fairly stated, in all material respects, in relation to the consolidated balance sheets from which it has been derived.

/s/    ERNST & YOUNG LLP

Dallas, Texas

May 2, 2018

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

INTRODUCTION

The following discussion should be read in conjunction with the condensed consolidated financial statements in this Quarterly Report on Form 10-Q and Management’s Discussion and Analysis in our Annual Report on Form 10-K for the year ended September 30, 2017.

Cautionary Statement for the Purposes of the Safe Harbor under the Private Securities Litigation Reform Act of 1995

The statements contained in this Quarterly Report on Form 10-Q may contain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements other than statements of historical fact included in this Report are forward-looking statements made in good faith by us and are intended to qualify for the safe harbor from liability established by the Private Securities Litigation Reform Act of 1995. When used in this Report, or any other of our documents or oral presentations, the words “anticipate”, “believe”, “estimate”, “expect”, “forecast”, “goal”, “intend”, “objective”, “plan”, “projection”, “seek”, “strategy” or similar words are intended to identify forward-looking statements. Such forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those expressed or implied in the statements relating to our strategy, operations, markets, services, rates, recovery of costs, availability of gas supply and other factors. These risks and uncertainties include the following: our ability to continue to access the credit and capital markets to execute our business strategy; regulatory trends and decisions, including the impact of rate proceedings before various state regulatory commissions; the impact of adverse economic conditions on our customers; the effects of inflation and changes in the availability and price of natural gas; the availability and accessibility of contracted gas supplies, interstate pipeline and/or storage services; market risks beyond our control affecting our risk management activities, including commodity price volatility, counterparty performance or creditworthiness and interest rate risk; the concentration of our operations in Texas; increased competition from energy suppliers and alternative forms of energy; adverse weather conditions; the capital-intensive nature of our business; increased costs of providing health care benefits, along with pension and postretirement health care benefits and increased funding requirements; the inability to continue to hire, train and retain operational, technical and managerial personnel; possible increased federal, state and local regulation of the safety of our operations; increased federal regulatory oversight and potential penalties; the impact of environmental regulations on our business; the impact of climate change or related additional legislation or regulation in the future; the inherent hazards and risks involved in distributing, transporting and storing natural gas; the threat of cyber-attacks or acts of cyber-terrorism that could disrupt our business operations and information technology systems or result in the loss or exposure of confidential or sensitive customer, employee or Company information; natural disasters, terrorist activities or other events and other risks and uncertainties discussed herein, all of which are difficult to predict and many of which are beyond our control. Accordingly, while we believe these forward-looking statements to be reasonable, there can be no assurance that they will approximate actual experience or that the expectations derived from them will be realized. Further, we undertake no obligation to update or revise any of our forward-looking statements whether as a result of new information, future events or otherwise.

OVERVIEW

Atmos Energy and our subsidiaries are engaged in the regulated natural gas distribution and pipeline and storage businesses. We distribute natural gas through sales and transportation arrangements to over three million residential, commercial, public authority and industrial customers throughout our six distribution divisions, which at March 31, 2018 covered service areas located in eight states. In addition, we transport natural gas for others through our distribution and pipeline systems.

We manage and review our consolidated operations through the following reportable segments:

• The distribution segment is primarily comprised of our regulated natural gas distribution and related sales operations in eight states.

• The pipeline and storage segment is comprised primarily of the pipeline and storage operations of our Atmos Pipeline-Texas division and our natural gas transmission operations in Louisiana.

• The natural gas marketing segment was comprised of our discontinued natural gas marketing business.

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CRITICAL ACCOUNTING ESTIMATES AND POLICIES

Our condensed consolidated financial statements were prepared in accordance with accounting principles generally accepted in the United States. Preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses and the related disclosures of contingent assets and liabilities. We based our estimates on historical experience and various other assumptions that we believe to be reasonable under the circumstances. On an ongoing basis, we evaluate our estimates, including those related to risk management and trading activities, the allowance for doubtful accounts, legal and environmental accruals, insurance accruals, pension and postretirement obligations, deferred income taxes and the valuation of goodwill, indefinite-lived intangible assets and other long-lived assets. Actual results may differ from such estimates.

Our critical accounting policies used in the preparation of our consolidated financial statements are described in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017 and include the following:

• Regulation

• Unbilled revenue

• Pension and other postretirement plans

• Impairment assessments

Our critical accounting policies are reviewed periodically by the Audit Committee of our Board of Directors. There were no significant changes to these critical accounting policies during the six months ended March 31, 2018.

Non-GAAP Financial Measures

Our operations are affected by the cost of natural gas, which is passed through to our customers without markup and includes commodity price, transportation, storage, injection and withdrawal fees and settlements of financial instruments used to mitigate commodity price risk. These costs are reflected in the income statement as purchased gas cost. Therefore, increases in the cost of gas are offset by a corresponding increase in revenues. Accordingly, we believe contribution margin, a non-GAAP financial measure, defined as operating revenues less purchased gas cost, is a more useful and relevant measure to analyze our financial performance than operating revenues. As such, the following discussion and analysis of our financial performance will reference contribution margin rather than operating revenues and purchased gas cost individually. Further, the term contribution margin is not intended to represent operating income, the most comparable GAAP financial measure, as an indicator of operating performance and is not necessarily comparable to similarly titled measures reported by other companies.

As described further in Note 6, the enactment of the Tax Cuts and Jobs Act of 2017 (the "TCJA") required us to remeasure our deferred tax assets and liabilities at our new federal statutory income tax rate as of December 22, 2017. The remeasurement of our net deferred tax liabilities resulted in the recognition of a one-time, non-cash income tax benefit of $165.7 million for the six months ended March 31, 2018. During the three months ended March 31, 2018, we recognized a $3.8 million benefit after we refined the initial measurement calculations performed during the first quarter. Due to the non-recurring nature of this benefit, we believe that income from continuing operations and diluted earnings per share from continuing operations before the one-time, non-cash income tax benefit provide a more relevant measure to analyze our financial performance than income from continuing operations and consolidated diluted earnings per share from continuing operations. Accordingly, the following discussion and analysis of our financial performance will reference adjusted income from continuing operations and diluted earnings per share, which is calculated as follows:

	Three Months Ended March 31
	2018		2017		Change
	(In thousands, except per share data)
Income from continuing operations	$	178,992	$	162,012	$	16,980
TCJA non-cash income tax benefit	3,791		—		3,791
Adjusted income from continuing operations	$	175,201	$	162,012	$	13,189
Consolidated diluted EPS from continuing operations	$	1.60	$	1.52	$	0.08
Diluted EPS from TCJA non-cash income tax benefit	0.03		—		0.03
Adjusted diluted EPS from continuing operations	$	1.57	$	1.52	$	0.05

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	Six Months Ended March 31
	2018		2017		Change
	(In thousands, except per share data)
Income from continuing operations	$	493,124	$	276,050	$	217,074
TCJA non-cash income tax benefit	165,675		—		165,675
Adjusted income from continuing operations	$	327,449	$	276,050	$	51,399
Consolidated diluted EPS from continuing operations	$	4.47	$	2.61	$	1.86
Diluted EPS from TCJA non-cash income tax benefit	1.50		—		1.50
Adjusted diluted EPS from continuing operations	$	2.97	$	2.61	$	0.36

RESULTS OF OPERATIONS

Executive Summary

Atmos Energy strives to operate our businesses safely and reliably while delivering superior shareholder value. Our commitment to modernizing our natural gas distribution and transmission systems requires significant levels of capital spending. We have the ability to begin recovering a significant portion of these investments timely through rate designs that reduce or eliminate regulatory lag and separate the recovery of our approved rate from customer usage patterns. The execution of our capital spending program, the ability to recover these investments timely and our ability to access the capital markets to satisfy our financing needs are the primary drivers that affect our financial performance.

During the six months ended March 31, 2018, we recorded income from continuing operations of $493.1 million, or $4.47 per diluted share, compared to income from continuing operations of $276.1 million, or $2.61 per diluted share for the six months ended March 31, 2017.

After adjusting for the nonrecurring benefit recognized after implementing the TCJA, we recorded adjusted income from continuing operations of $327.4 million, or $2.97 per diluted share for the six months ended March 31, 2018, compared to adjusted income from continuing operations of $276.1 million, or $2.61 per diluted share for the six months ended March 31, 2017. The period-over-period increase of $51.3 million, or 19 percent, largely reflects positive rate outcomes, weather that was 33 percent colder than the prior year, customer growth in our distribution business and the impact of the TCJA on our effective income tax rate, partially offset by reduced revenues as a result of implementing the TCJA. During the six months ended March 31, 2018, we completed ten regulatory proceedings, resulting in an increase in annual operating income of $47.4 million and had ten ratemaking efforts in progress at March 31, 2018 seeking a total increase in annual operating income of $65.3 million. On April 3, 2018, we filed formula rate mechanisms in our Mid-Tex and West Texas service areas, seeking increases in operating income of $28.0 million and $4.0 million.

Capital expenditures for the first six months of fiscal 2018 were $694.0 million. Over 80 percent was invested to improve the safety and reliability of our distribution and transportation systems, with a significant portion of this investment incurred under regulatory mechanisms that reduce lag to six months or less. We expect our capital expenditures to approximate $1.4 billion for fiscal 2018. We funded our capital expenditures program primarily through operating cash flows of $751.4 million. Additionally, we issued $400 million of common stock during the six months ended March 31, 2018. The net proceeds from the issuance were primarily used to repay short-term debt under our commercial paper program, to fund capital spending and for general corporate purposes.

As a result of our sustained financial performance, improved cash flows and capital structure, our Board of Directors increased the quarterly dividend by 7.8 percent for fiscal 2018.

TCJA Impact

The TCJA introduced several significant changes to corporate income tax laws in the United States, which have been reflected in our condensed consolidated financial statements for the period ended March 31, 2018. As a rate regulated entity, the effects of lower tax rates included in our cost of service rates will ultimately flow through to our utility customers in the form of adjusted rates. Therefore, the favorable impact of the reduction in our federal statutory income tax rate on our financial performance will be limited to items that impact our income before income taxes in the current period that have not yet been reflected in our rates (most notably increases to and decreases in commission-approved regulatory assets and liabilities recorded on our condensed consolidated balance sheet) and market-based revenues that are earned from customers who utilize our assets. Note 6 to the condensed consolidated financial statements details the various impacts of the TCJA on our financial position and results from operations. The most significant changes are summarized as follows:

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• Because our fiscal year started on October 1, 2017, our federal statutory income tax rate for fiscal 2018 was reduced from 35% to 24.5%. We anticipate our effective income tax rate for fiscal 2018 will range from 26% to 28%, before the effect of the return of the excess deferred tax liability and the one-time, non-cash income tax benefit. Our federal statutory income tax rate will decline to 21% on October 1, 2018.

• As a result of implementing the TCJA, we remeasured our net deferred tax liability using our new federal statutory income tax rate, which reduced our net deferred tax liability by $903.5 million. Of this amount, $737.8 million was reclassified to a regulatory liability, which will be returned to utility customers. The remaining $165.7 million was recognized as a one-time, non-cash income tax benefit in our condensed consolidated statement of income for the six months ended March 31, 2018. Of this amount, $3.8 million was recorded during the second quarter as we refined the remeasurement calculations performed during the first quarter.

• Atmos Energy supports our regulators' efforts to ensure our utility customers receive the full benefits of changes in our cost of service rates arising from tax reform. Income taxes, like other costs, are passed through to our customers in our rates; however, changes to customer rates must be approved by our regulators. Beginning in the second quarter of fiscal 2018, we established regulatory liabilities in all our jurisdictions for the difference in taxes included in our cost of service rates that have been calculated based on a 35% statutory income tax rate and a 21% statutory income tax rate. The establishment of these regulatory liabilities for our cost of service rates reduced our revenues. The period and timing of the return of these liabilities to utility customers will be determined by regulators in each of our jurisdictions. During the second quarter of fiscal 2018, some of our jurisdictions have approved changes to customer rates as discussed in Note 6, which have been reflected in customer bills as of the effective dates stipulated in the regulatory or statutory proceeding. Return to customers of the regulatory liabilities related to the TCJA in these jurisdictions will be addressed in future regulatory proceedings.

• The enactment of the TCJA is expected to reduce our cash flows from operations primarily due to 1) the collection of taxes at a lower rate and 2) the return of regulatory liabilities established in response to the enactment of the TCJA and regulatory activities to our utility customers. We intend to externally finance this reduction in operating cash flow in a balanced fashion in order to maintain an equity-to-total-capitalization ratio ranging from 50% to 60% to maintain our current credit ratings. We currently anticipate this external financing need will range from $500 million to $600 million through fiscal 2022.

The following discusses the results of operations for each of our operating segments.

Distribution Segment

The distribution segment is primarily comprised of our regulated natural gas distribution and related sales operations in eight states. The primary factors that impact the results of this segment are our ability to earn our authorized rates of return, the cost of natural gas, competitive factors in the energy industry and economic conditions in our service areas.

Our ability to earn our authorized rates of return is based primarily on our ability to improve the rate design in our various ratemaking jurisdictions by reducing or eliminating regulatory lag and, ultimately, separating the recovery of our approved margins from customer usage patterns. Improving rate design is a long-term process and is further complicated by the fact that we operate in multiple rate jurisdictions.

Seasonal weather patterns can also affect our distribution operations. However, the effect of weather that is above or below normal is substantially offset through weather normalization adjustments, known as WNA, which has been approved by state regulatory commissions for approximately 97 percent of our residential and commercial meters in the following states for the following time periods:

Kansas, West Texas	October — May
Tennessee	October — April
Kentucky, Mississippi, Mid-Tex	November — April
Louisiana	December — March
Virginia	January — December

Our distribution operations are also affected by the cost of natural gas. The cost of gas is passed through to our customers without markup. Therefore, increases in the cost of gas are offset by a corresponding increase in revenues. Contribution margin in our Texas and Mississippi service areas includes franchise fees and gross receipts taxes, which are calculated as a percentage of revenue (inclusive of gas costs). Therefore, the amount of these taxes included in revenues is influenced by the cost of gas and the level of gas sales volumes. We record the associated tax expense as a component of taxes, other than income. Although changes in these revenue-related taxes arising from changes in gas costs affect contribution margin, over time the impact is offset within operating income.

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As discussed above, the cost of gas typically does not have a direct impact on our contribution margin. However, higher gas costs mean higher bills for our customers, which may adversely impact our accounts receivable collections, resulting in higher bad debt expense and may require us to increase borrowings under our credit facilities resulting in higher interest expense. In addition, higher gas costs, as well as competitive factors in the industry and general economic conditions may cause customers to conserve or, in the case of industrial consumers, to use alternative energy sources. However, gas cost risk has been mitigated in recent years through improvements in rate design that allow us to collect from our customers the gas cost portion of our bad debt expense on approximately 76 percent of our residential and commercial margins.

Three Months Ended March 31, 2018 compared with Three Months Ended March 31, 2017

Financial and operational highlights for our distribution segment for the three months ended March 31, 2018 and 2017 are presented below.

	Three Months Ended March 31
	2018			2017		Change
	(In thousands, unless otherwise noted)
Operating revenues	$	1,199,291		$	962,541	$	236,750
Purchased gas cost	727,053			513,096		213,957
Contribution margin	472,238			449,445		22,793
Operating expenses	262,332			222,641		39,691
Operating income	209,906			226,804		(16,898		)
Miscellaneous income	393			1,029		(636		)
Interest charges	16,898			16,925		(27		)
Income before income taxes	193,401			210,908		(17,507		)
TCJA non-cash income tax benefit	(3,791		)	—		(3,791		)
Income tax expense	51,949			79,763		(27,814		)
Net income	$	145,243		$	131,145	$	14,098
Consolidated distribution sales volumes — MMcf	134,046			97,754		36,292
Consolidated distribution transportation volumes — MMcf	45,932			39,915		6,017
Total consolidated distribution throughput — MMcf	179,978			137,669		42,309
Consolidated distribution average cost of gas per Mcf sold	$	5.42		$	5.25	$	0.17

Income before income taxes for our distribution segment decreased 8 percent, primarily due to a $39.7 million increase in operating expenses, partially offset by a $22.8 million increase in contribution margin. The quarter-over-quarter increase in contribution margin primarily reflects:

• a $27.6 million net increase in rate adjustments, before the effect of the TCJA, primarily in our Mid-Tex and West Texas Divisions.

• a $9.3 million increase in residential and commercial net consumption, primarily in our Mid-Tex and Mississippi Divisions.

• an $8.9 million increase in revenue-related taxes primarily in our Mid-Tex Division, offset by a corresponding $5.4 million increase in the related tax expense.

• a $4.3 million increase in transportation margin primarily in our Kentucky/Mid-States and West Texas Divisions.

• a $26.2 million decrease in contribution margin due to the inclusion of the lower statutory rate in our revenues due to implementation of the TCJA. Of this amount, $4.8 million has been reflected in customer bills. The remaining $21.4 million relates to the establishment of regulatory liabilities for the difference between the former 35% federal statutory rate and the current 21% federal statutory rate as further described in Note 6.

The increase in operating expenses, which includes operation and maintenance expense, provision for doubtful accounts, depreciation and amortization expense and taxes, other than income, largely reflects expenses incurred after we decided to undertake a planned outage of our natural gas distribution system in Northwest Dallas. In late February 2018, there were gas-related incidents in Northwest Dallas, one of which resulted in a fatality and injuries to four other residents.  The National Transportation Safety Board (NTSB) is investigating the latter incident. Together with the Railroad Commission of Texas and the Pipeline and Hazardous Materials Safety Administration, we are a party to the investigation and in that capacity we are working closely with the NTSB to help determine the cause of this incident.  On March 1, 2018, we initiated a planned outage of a portion of our natural gas distribution system in Northwest Dallas that affected approximately 2,400 homes.  The outage

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was initiated after we experienced a sudden and unexplainable increase in leaks in this confined geographic area in less than a week’s time.  Based upon our preliminary assessment, we believe an extraordinary combination of events and circumstances that could not have been predicted, anticipated, readily modeled or foreseen damaged our pipeline system in that area.  These events and circumstances, include, but are not limited to, geology, hydrology, soil conditions and record rainfall.  The system was replaced and placed into service by March 31, 2018.  While the system was replaced, we provided financial assistance to the affected residents and incurred other related costs of approximately $23 million.

The remaining increase in operating expenses is attributable to incremental system integrity activities, increased depreciation and property taxes associated with increased capital investments.

The decrease in income tax expense reflects a reduction in our effective tax rate from 37.8% to 26.9%, as a result of the TCJA.

The following table shows our operating income by distribution division, in order of total rate base, for the three months ended March 31, 2018 and 2017. The presentation of our distribution operating income is included for financial reporting purposes and may not be appropriate for ratemaking purposes.

	Three Months Ended March 31
	2018		2017		Change
	(In thousands)
Mid-Tex	$	78,190	$	90,809	$	(12,619	)
Kentucky/Mid-States	36,529		34,010		2,519
Louisiana	30,760		30,362		398
West Texas	21,430		21,023		407
Mississippi	25,096		25,802		(706		)
Colorado-Kansas	17,474		18,331		(857		)
Other	427		6,467		(6,040		)
Total	$	209,906	$	226,804	$	(16,898	)

Six Months Ended March 31, 2018 compared with Six Months Ended March 31, 2017

Financial and operational highlights for our distribution segment for the six months ended March 31, 2018 and 2017 are presented below.

	Six Months Ended March 31
	2018			2017		Change
	(In thousands, unless otherwise noted)
Operating revenues	$	2,060,083		$	1,717,197	$	342,886
Purchased gas cost	1,190,811			908,442		282,369
Contribution margin	869,272			808,755		60,517
Operating expenses	486,610			427,058		59,552
Operating income	382,662			381,697		965
Miscellaneous (expense) income	(1,007		)	396		(1,403		)
Interest charges	38,266			38,043		223
Income before income taxes	343,389			344,050		(661		)
One-time, non-cash income tax benefit	(143,942		)	—		(143,942		)
Income tax expense	92,989			127,541		(34,552		)
Net income	$	394,342		$	216,509	$	177,833
Consolidated regulated distribution sales volumes — MMcf	220,353			172,184		48,169
Consolidated regulated distribution transportation volumes — MMcf	83,982			76,090		7,892
Total consolidated regulated distribution throughput — MMcf	304,335			248,274		56,061
Consolidated regulated distribution average cost of gas per Mcf sold	$	5.40		$	5.28	$	0.12

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Income before income taxes for our distribution segment was flat compared to the prior year, primarily due to a $59.6 million increase in operating expenses offset with a $60.5 million increase in contribution margin. The year-over-year increase in contribution margin primarily reflects:

• a $53.1 million net increase in rate adjustments, excluding rate adjustments resulting from the TCJA, primarily in our Mid-Tex, Kentucky/Mid-States and West Texas Divisions.

• a $15.0 million increase in residential and commercial net consumption, primarily in our Mid-Tex and Mississippi Divisions.

• an $11.2 million increase in revenue-related taxes primarily in our Mid-Tex Division, offset by a corresponding $7.7 million increase in the related tax expense.

• a $6.0 million increase in transportation margin primarily in our Kentucky/Mid-States Division.

• a $26.2 million decrease in contribution margin as a result of lower taxes included in our cost of service rates due to implementation of the TCJA, as discussed above.

The increase in operating expenses reflects expenses incurred with the planned outage we initiated in March 2018, as discussed above, combined with incremental system integrity activities, property taxes and depreciation expense associated with increased capital investments.

The decrease in income tax expense reflects a reduction in our effective tax rate from 37.1% to 27.1%, as a result of the TCJA.

The following table shows our operating income by distribution division, in order of total rate base, for the six months ended March 31, 2018 and 2017. The presentation of our distribution operating income is included for financial reporting purposes and may not be appropriate for ratemaking purposes.

	Six Months Ended March 31
	2018		2017		Change
	(In thousands)
Mid-Tex	$	151,115	$	163,552	$	(12,437	)
Kentucky/Mid-States	64,658		56,748		7,910
Louisiana	54,028		50,225		3,803
West Texas	37,191		35,951		1,240
Mississippi	43,371		37,760		5,611
Colorado-Kansas	30,405		30,036		369
Other	1,894		7,425		(5,531		)
Total	$	382,662	$	381,697	$	965

Recent Ratemaking Developments

The amounts described in the following sections represent the operating income that was requested or received in each rate filing, which may not necessarily reflect the stated amount referenced in the final order, as certain operating costs may have changed as a result of a commission’s or other governmental authority’s final ruling. During the first six months of fiscal 2018, we completed nine regulatory proceedings, resulting in an $18.4 million increase in annual operating income as summarized below.

Rate Action	Annual Increase in Operating Income
	(In thousands)
Annual formula rate mechanisms	$	17,897
Rate case filings	84
Other rate activity	457
	$	18,438

The following ratemaking efforts seeking $23.1 million in increased annual operating income were in progress as of March 31, 2018:

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Division	Rate Action	Jurisdiction	Operating Income Requested
			(In thousands)
Colorado-Kansas	Rate Case	Colorado(1)	$	2,916
Kentucky/Mid-States	Rate Case	Kentucky(1)	4,778
Kentucky/Mid-States	Formula Rate Mechanism	Tennessee(1)	850
Louisiana	Formula Rate Mechanism	Trans La (1)(3)	1,195
Louisiana	Formula Rate Mechanism	LGS (2)	(1,521		)
Mid-Tex	Infrastructure Mechanism	Environs (2)	1,604
Mississippi	Infrastructure Mechanism	Mississippi (2)	8,000
West Texas	Infrastructure Mechanism	Cities of Amarillo, Channing, Dalhart, and Lubbock (2)	4,418
West Texas	Infrastructure Mechanism	Environs (2)	826
			$	23,066

(1) These filings were filed prior to the enactment of the TCJA. The impact of the TCJA along with other items considered in establishing rates will result in a difference between the requested amounts and the final amount approved by the commission.

(2) The filing amount reflects a 21% federal income tax rate resulting from the TCJA.

(3) The Louisiana Public Service Commission Staff issued a report, reflecting the impact of TCJA, which recommends a base rate decrease of $1.9 million, effective May 1, 2018.

Annual Formula Rate Mechanisms

As an instrument to reduce regulatory lag, formula rate mechanisms allow us to refresh our rates on an annual basis without filing a formal rate case. However, these filings still involve discovery by the appropriate regulatory authorities prior to the final determination of rates under these mechanisms. We currently have formula rate mechanisms in our Louisiana, Mississippi and Tennessee operations and in substantially all the service areas in our Texas divisions. Additionally, we have specific infrastructure programs in substantially all of our distribution divisions with tariffs in place to permit the investment associated with these programs to have their surcharge rate adjusted annually to recover approved capital costs incurred in a prior test-year period. The following table summarizes our annual formula rate mechanisms by state:

	Annual Formula Rate Mechanisms
State	Infrastructure Programs	Formula Rate Mechanisms
Colorado	System Safety and Integrity Rider (SSIR)	—
Kansas	Gas System Reliability Surcharge (GSRS)	—
Kentucky	Pipeline Replacement Program (PRP)	—
Louisiana	(1)	Rate Stabilization Clause (RSC)
Mississippi	System Integrity Rider (SIR)	Stable Rate Filing (SRF), Supplemental Growth Filing (SGR)
Tennessee	—	Annual Rate Mechanism (ARM)
Texas	Gas Reliability Infrastructure Program (GRIP), (1)	Dallas Annual Rate Review (DARR), Rate Review Mechanism (RRM)
Virginia	Steps to Advance Virginia Energy (SAVE)	—

(1) Infrastructure mechanisms in Texas and Louisiana allow for the deferral of all expenses associated with capital expenditures incurred pursuant to these rules, which primarily consists of interest, depreciation and other taxes (Texas only), until the next rate proceeding (rate case or annual rate filing), at which time investment and costs would be recoverable through base rates.

The following annual formula rate mechanisms were approved during the six months ended March 31, 2018:

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Division	Jurisdiction	Test Year Ended	Increase in Annual Operating Income		Effective Date
		(In thousands)
2018 Filings:
Colorado-Kansas	Kansas GSRS	09/30/2018	$	820	02/27/2018
Colorado-Kansas	Colorado SSIR	12/31/2018	2,228		12/20/2017
Mississippi	Mississippi - SIR	10/31/2018	7,658		12/05/2017
Mississippi	Mississippi - SGR (1)	10/31/2018	1,245		12/05/2017
Mississippi	Mississippi - SRF (1)	10/31/2018	—		12/05/2017
Kentucky/Mid-States	Kentucky - PRP	09/30/2018	5,638		10/27/2017
Kentucky/Mid-States	Virginia - SAVE (2)	09/30/2017	308		10/01/2017
Total 2018 Filings			$	17,897

(1) In our next SRF filing, the SGR rate base will be combined with the SRF rate base, per Commission order.

(2) The Company completed our Steps to Advance Virginia Energy (SAVE) program. On October 1, 2017 a refund factor was removed from the rate resulting in an operating income increase of $0.3 million.

Rate Case Filings

A rate case is a formal request from Atmos Energy to a regulatory authority to increase rates that are charged to our customers. Rate cases may also be initiated when the regulatory authorities request us to justify our rates. This process is referred to as a “show cause” action. Adequate rates are intended to provide for recovery of the Company’s costs as well as a fair rate of return and ensure that we continue to deliver reliable, reasonably priced natural gas service safely to our customers. The following table summarizes the rate cases that were completed during the six months ended March 31, 2018.

Division	State	Increase in Annual Operating Income		Effective Date
		(In thousands)
2018 Rate Case Filings:
Mid-Tex	City of Dallas (1)	$	84	02/14/2018
Total 2018 Rate Case Filings		$	84

(1) The operating income reflects a 21% federal income tax rate resulting from the TCJA.

Other Ratemaking Activity

The following table summarizes other ratemaking activity during the six months ended March 31, 2018.

Division	Jurisdiction	Rate Activity	Additional Annual Operating Income		Effective Date
			(In thousands)
2018 Other Rate Activity:
Colorado-Kansas	Kansas	Ad Valorem(1)	$	457	02/01/2018
Total 2018 Other Rate Activity			$	457

(1) The Ad Valorem filing relates to a collection of property taxes in excess of the amount included in our Kansas service area's base rates.

Pipeline and Storage Segment

Our pipeline and storage segment consists of the pipeline and storage operations of our Atmos Pipeline–Texas Division (APT) and our natural gas transmission operations in Louisiana. APT is one of the largest intrastate pipeline operations in Texas with a heavy concentration in the established natural gas producing areas of central, northern, eastern and western Texas, extending into or near the major producing areas of the Barnett Shale, the Texas Gulf Coast and the Delaware and Midland Basins of West Texas. APT provides transportation and storage services to our Mid-Tex Division, other third-party local

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distribution companies, industrial and electric generation customers, as well as marketers and producers. As part of its pipeline operations, APT manages five underground storage facilities in Texas.

Our natural gas transmission operations in Louisiana are comprised of a proprietary 21-mile pipeline located in the New Orleans, Louisiana area that is primarily used to aggregate gas supply for our distribution division in Louisiana under a long-term contract and on a more limited basis, to third parties. The demand fee charged to our Louisiana distribution division for these services is subject to regulatory approval by the Louisiana Public Service Commission. We also manage two asset management plans which have been approved by applicable state regulatory commissions. Generally, these asset management plans require us to share with our distribution customers a significant portion of the cost savings earned from these arrangements.

Our pipeline and storage segment is impacted by seasonal weather patterns, competitive factors in the energy industry and economic conditions in our Texas and Louisiana service areas. Natural gas prices do not directly impact the results of this segment as revenues are derived from the transportation and storage of natural gas. However, natural gas prices and demand for natural gas could influence the level of drilling activity in the markets that we serve, which may influence the level of throughput we may be able to transport on our pipeline. Further, natural gas price differences between the various hubs that we serve in Texas could influence the volumes of gas transported for shippers through our Texas pipeline system and the rates for such transportation.

The results of APT are also significantly impacted by the natural gas requirements of its local distribution company customers. Additionally, its operations may be impacted by the timing of when costs and expenses are incurred and when these costs and expenses are recovered through its tariffs.

APT annually uses GRIP to recover capital costs incurred in the prior calendar year. Following the conclusion of its rate case in August 2017, APT made a GRIP filing that covered changes in net investment from October 1, 2016 through December 31, 2016 with a requested increase in operating income of $29.0 million. On December 5, 2017, the filing was approved. On February 15, 2018, APT made a GRIP filing that covered changes in net investment from January 1, 2017 through December 31, 2017 with a requested increase in operating income of $42.2 million.

On December 21, 2016, the Louisiana Public Service Commission approved an annual increase of five percent to the demand fee charged by our natural gas transmission pipeline for each of the next 10 years, effective October 1, 2017.

Three Months Ended March 31, 2018 compared with Three Months Ended March 31, 2017

Financial and operational highlights for our pipeline and storage segment for the three months ended March 31, 2018 and 2017 are presented below.

	Three Months Ended March 31
	2018			2017			Change
	(In thousands, unless otherwise noted)
Mid-Tex / Affiliate transportation revenue	$	89,631		$	84,292		$	5,339
Third-party transportation revenue	28,414			22,824			5,590
Other revenue	2,910			4,856			(1,946		)
Total operating revenues	120,955			111,972			8,983
Total purchased gas cost	433			725			(292		)
Contribution margin	120,522			111,247			9,275
Operating expenses	61,440			52,879			8,561
Operating income	59,082			58,368			714
Miscellaneous expense	(646		)	(196		)	(450		)
Interest charges	10,406			10,019			387
Income before income taxes	48,030			48,153			(123		)
Income tax expense	14,281			17,286			(3,005		)
Net income	$	33,749		$	30,867		$	2,882
Gross pipeline transportation volumes — MMcf	237,167			195,233			41,934
Consolidated pipeline transportation volumes — MMcf	148,980			131,151			17,829

Income before income taxes for our pipeline and storage segment was flat year over year, due to a $9.3 million increase in contribution margin, partially offset by an $8.6 million increase in operating expenses. The increase in contribution margin primarily reflects:

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• a $16.5 million increase in rates from the approved APT rate case and the GRIP filing approved in December 2017.

• a net increase of $1.7 million due to wider spreads and positive supply and demand dynamics affecting the Permian Basin.

• an $8.0 million decrease due to the inclusion of the lower statutory rate in our revenues due to implementation of the TCJA. Of this amount, $0.2 million has been reflected in customer bills. The remaining $7.8 million relates to the establishment of regulatory liabilities for the difference between the former 35% federal statutory rate and the current 21% federal statutory rate as further described in Note 6.

Operating expenses increased $8.6 million, primarily due to higher depreciation expense and higher system maintenance expense.

The decrease in income tax expense reflects a reduction in our effective tax rate from 35.9% to 29.7%, as a result of the TCJA.

Six Months Ended March 31, 2018 and Six Months Ended March 31, 2017

Financial and operational highlights for our pipeline and storage segment for the six months ended March 31, 2018 and 2017 are presented below.

	Six Months Ended March 31
	2018			2017			Change
	(In thousands, unless otherwise noted)
Mid-Tex / Affiliate transportation revenue	$	183,529		$	166,760		$	16,769
Third-party transportation revenue	57,345			45,044			12,301
Other revenue	6,544			10,120			(3,576		)
Total operating revenues	247,418			221,924			25,494
Total purchased gas cost	1,345			1,080			265
Contribution margin	246,073			220,844			25,229
Operating expenses	118,186			107,451			10,735
Operating income	127,887			113,393			14,494
Miscellaneous expense	(1,281		)	(557		)	(724		)
Interest charges	20,547			19,931			616
Income before income taxes	106,059			92,905			13,154
One-time, non-cash income tax benefit	(21,733		)	—			(21,733		)
Income tax expense	29,010			33,364			(4,354		)
Net income	$	98,782		$	59,541		$	39,241
Gross pipeline transportation volumes — MMcf	450,304			382,013			68,291
Consolidated pipeline transportation volumes — MMcf	304,085			266,127			37,958

Income before income taxes for our pipeline and storage segment increased 14 percent, primarily due to a $25.2 million increase in contribution margin, offset by a $10.7 million increase in operating expenses. The increase in contribution margin primarily reflects:

• a $30.4 million increase in rates from the approved APT rate case and the GRIP filing approved in December 2017.

• a net increase of $3.1 million due to wider spreads and positive supply and demand dynamics affecting the Permian Basin.

• an $8.0 million decrease in rates due to the implementation of the TCJA, as discussed above.

Operating expenses increased $10.7 million, primarily due to higher depreciation expense partially offset by the timing of system maintenance expense.

The decrease in income tax expense primarily reflects a reduction in our effective tax rate from 35.9% to 27.4%, as a result of the TCJA.

Natural Gas Marketing Segment

Through December 31, 2016, we were engaged in an unregulated natural gas marketing business, which was conducted by Atmos Energy Marketing (AEM). AEM’s primary business was to aggregate and purchase gas supply, arrange

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transportation and storage logistics and ultimately deliver gas to customers at competitive prices. Additionally, AEM utilized proprietary and customer-owned transportation and storage assets to provide various services its customers requested.

As more fully described in Note 13, effective January 1, 2017, we sold all of the equity interests of AEM to CenterPoint Energy Services, Inc. (CES), a subsidiary of CenterPoint Energy Inc. As a result of the sale, Atmos Energy fully exited the nonregulated natural gas marketing business. Accordingly, a gain on sale from discontinued operations for $2.7 million was recorded for the three and six months ended March 31, 2017 and net income of $11.0 million for AEM is reported as discontinued operations for the six months ended March 31, 2017.Liquidity and Capital Resources

The liquidity required to fund our working capital, capital expenditures and other cash needs is provided from a combination of internally generated cash flows and external debt and equity financing. External debt financing is provided primarily through the issuance of long-term debt, a $1.5 billion commercial paper program and three committed revolving credit facilities with a total availability from third-party lenders of approximately $1.5 billion. The commercial paper program and credit facilities provide cost-effective, short-term financing until it can be replaced with a balance of long-term debt and equity financing that achieves the Company's desired capital structure with an equity-to-total-capitalization ratio between 50% and 60%, inclusive of long-term and short-term debt. Additionally, we have various uncommitted trade credit lines with our gas suppliers that we utilize to purchase natural gas on a monthly basis. The liquidity provided by these sources is expected to be sufficient to fund the Company's working capital needs and capital expenditure program for the remainder of fiscal year 2018 and beyond. Please refer to the TCJA Impact section above regarding anticipated impacts on our liquidity, capital resources and cash flows.

To support our capital market activities, we have a registration statement on file with the SEC that permits us to issue a total of $2.5 billion in common stock and/or debt securities. Under the shelf registration statement, we recently filed a prospectus supplement for an at-the-market (ATM) equity distribution program under which we may issue and sell shares of our common stock up to an aggregate offering price of $500 million. At March 31, 2018, approximately $1.2 billion of securities remained available for issuance under the shelf registration statement.

The following table presents our capitalization inclusive of short-term debt and the current portion of long-term debt as of March 31, 2018, September 30, 2017 and March 31, 2017:

	March 31, 2018				September 30, 2017				March 31, 2017
	(In thousands, except percentages)
Short-term debt	$	129,602	1.6	%	$	447,745	6.0	%	$	670,607	9.5	%
Long-term debt(1)	3,067,892		38.8	%	3,067,045		41.4	%	2,564,620		36.3	%
Shareholders’ equity	4,721,346		59.6	%	3,898,666		52.6	%	3,834,864		54.2	%
Total	$	7,918,840	100.0	%	$	7,413,456	100.0	%	$	7,070,091	100.0	%

(1) In March 2019, $450 million of long-term debt will mature. We plan to issue new senior notes to replace the maturing debt. We have executed forward starting interest rate swaps to effectively fix the Treasury yield component associated with this anticipated issuance at 3.78%.

Cash Flows

Our internally generated funds may change in the future due to a number of factors, some of which we cannot control. These include regulatory changes, prices for our products and services, demand for such products and services, margin requirements resulting from significant changes in commodity prices, operational risks and other factors.

Cash flows from operating, investing and financing activities for the six months ended March 31, 2018 and 2017 are presented below.

41

	Six Months Ended March 31
	2018			2017			Change
	(In thousands)
Total cash provided by (used in)
Operating activities	$	751,367		$	552,003		$	199,364
Investing activities	(688,144		)	(516,670		)	(171,474		)
Financing activities	(18,558		)	(37,464		)	18,906
Change in cash and cash equivalents	44,665			(2,131		)	46,796
Cash and cash equivalents at beginning of period	26,409			47,534			(21,125		)
Cash and cash equivalents at end of period	$	71,074		$	45,403		$	25,671

Cash flows from operating activities

Period-over-period changes in our operating cash flows are primarily attributable to changes in net income and working capital changes, particularly within our distribution segment resulting from changes in the price of natural gas and the timing of customer collections, payments for natural gas purchases and deferred gas cost recoveries.

For the six months ended March 31, 2018, we generated cash flow of $751.4 million from operating activities compared with $552.0 million for the six months ended March 31, 2017. The $199.4 million increase in operating cash flows reflects the positive cash effects of successful rate case outcomes achieved in fiscal 2017 and changes in working capital, primarily as a result of the timing of gas cost recoveries under our purchase gas cost mechanisms as a result of a period-over-period increase in sales volumes. This increase in sale volumes also contributed to the period-over-period increase in operating cash flow.

Cash flows from investing activities

In recent years, we have incurred capital expenditures to support our distribution and transmission system modernization and integrity enhancement efforts, expand our natural gas distribution services and expand our intrastate pipeline network. Over the last three fiscal years, approximately 80 percent of our capital spending has been committed to improving the safety and reliability of our system.

For the six months ended March 31, 2018, cash used for investing activities was $688.1 million compared to $516.7 million in the prior-year period. Capital spending increased by $134.6 million, or 24 percent, as a result of planned increases in our distribution segment to repair and replace vintage pipe, and increases in spending in our pipeline and storage segment to improve the reliability of gas service to our local distribution company customers. The period-over-period increase also reflects the absence in the current year period of $133.6 million in net proceeds received from the sale of AEM and the $85.7 million used to acquire the North Texas Pipeline in December 2016.

Cash flows from financing activities

For the six months ended March 31, 2018, our financing activities used $18.6 million of cash compared with $37.5 million in the prior-year period. The $18.9 million decrease in cash used in financing activities primarily reflects an increase in operating cash flow that exceeded an increase in cash used for investing activities during the six months ended March 31, 2018.

In the six months ended March 31, 2018, we used $395.1 million in net proceeds from equity financing to reduce short-term debt, to support our capital spending and for other general corporate purposes. Cash dividends increased due to a 7.8% increase in our dividend rate and an increase in shares outstanding.

In the six months ended March 31, 2017, we issued $125 million of long-term debt under our three year, $200 million term loan agreement and received $49.4 million from the issuance of common stock under our ATM program. The net proceeds from these debt and equity issuances were used to reduce short-term debt and support our capital expenditures program. Additionally, the return of cash collateral related to our forward-starting interest rate swaps due to an increase in interest rates provided cash from financing activities of $25.7 million.

42

The following table summarizes our share issuances for the six months ended March 31, 2018 and 2017:

	Six Months Ended   March 31
	2018	2017
Shares issued:
Direct Stock Purchase Plan	90,042	54,366
1998 Long-Term Incentive Plan	257,400	426,835
Retirement Savings Plan and Trust	49,848	172,932
At-the-Market (ATM) Equity Distribution Program	—	690,812
Equity Issuance	4,558,404	—
Total shares issued	4,955,694	1,344,945

Credit Ratings

Our credit ratings directly affect our ability to obtain short-term and long-term financing, in addition to the cost of such financing. In determining our credit ratings, the rating agencies consider a number of quantitative factors, including debt to total capitalization, operating cash flow relative to outstanding debt, operating cash flow coverage of interest and pension liabilities and funding status. In addition, the rating agencies consider qualitative factors such as consistency of our earnings over time, the quality of our management and business strategy, the risks associated with our businesses and the regulatory structures that govern our rates in the states where we operate.

Our debt is rated by two rating agencies: Standard & Poor’s Corporation (S&P) and Moody’s Investors Service (Moody’s). As of March 31, 2018, both rating agencies maintained a stable outlook. Our current debt ratings are all considered investment grade and are as follows:

	S&P	Moody’s
Senior unsecured long-term debt	A	A2
Short-term debt	A-1	P-1

A significant degradation in our operating performance or a significant reduction in our liquidity caused by more limited access to the private and public credit markets as a result of deteriorating global or national financial and credit conditions could trigger a negative change in our ratings outlook or even a reduction in our credit ratings by the three credit rating agencies. This would mean more limited access to the private and public credit markets and an increase in the costs of such borrowings.

A credit rating is not a recommendation to buy, sell or hold securities. The highest investment grade credit rating is AAA for S&P and Aaa for Moody’s. The lowest investment grade credit rating is BBB- for S&P and Baa3 for Moody’s. Our credit ratings may be revised or withdrawn at any time by the rating agencies, and each rating should be evaluated independently of any other rating. There can be no assurance that a rating will remain in effect for any given period of time or that a rating will not be lowered, or withdrawn entirely, by a rating agency if, in its judgment, circumstances so warrant.

Debt Covenants

We were in compliance with all of our debt covenants as of March 31, 2018. Our debt covenants are described in greater detail in Note 5 to the unaudited condensed consolidated financial statements.

Contractual Obligations and Commercial Commitments

Except as noted in Note 9 to the unaudited condensed consolidated financial statements, there were no significant changes in our contractual obligations and commercial commitments during the six months ended March 31, 2018.

Risk Management Activities

In our distribution and pipeline and storage segments, we use a combination of physical storage, fixed physical contracts and fixed financial contracts to reduce our exposure to unusually large winter-period gas price increases. Additionally, we manage interest rate risk by entering into financial instruments to effectively fix the Treasury yield component of the interest cost associated with anticipated financings. Through December 31, 2016, we managed our exposure to the risk of natural gas price changes in our natural gas marketing segment by locking in our contribution margin through a combination of storage and financial instruments, including futures, over-the-counter and exchange-traded options and swap contracts with counterparties.

43

The following table shows the components of the change in fair value of our financial instruments for the three and six months ended March 31, 2018 and 2017:

	Three Months Ended   March 31						Six Months Ended   March 31
	2018			2017			2018			2017
	(In thousands)
Fair value of contracts at beginning of period	$	(116,529	)	$	(121,722	)	$	(109,159	)	$	(279,543	)
Contracts realized/settled	(2,360		)	1,793			(1,200		)	11,756
Fair value of new contracts	(147		)	(2,560		)	(716		)	(1,597		)
Other changes in value	32,694			8,485			24,733			155,380
Fair value of contracts at end of period	(86,342		)	(114,004		)	(86,342		)	(114,004		)
Netting of cash collateral	—			—			—			—
Cash collateral and fair value of contracts at period end	$	(86,342	)	$	(114,004	)	$	(86,342	)	$	(114,004	)

The fair value of our financial instruments at March 31, 2018 is presented below by time period and fair value source:

	Fair Value of Contracts at March 31, 2018
	Maturity in Years
Source of Fair Value	Less Than 1			1-3		4-5		Greater Than 5		Total Fair Value
	(In thousands)
Prices actively quoted	$	(86,342	)	$	—	$	—	$	—	$	(86,342	)
Prices based on models and other valuation methods	—			—		—		—		—
Total Fair Value	$	(86,342	)	$	—	$	—	$	—	$	(86,342	)

Pension and Postretirement Benefits Obligations

For the six months ended March 31, 2018 and 2017, our total net periodic pension and other benefits costs were $20.9 million and $23.2 million. A substantial portion of those costs is recoverable through our rates; however, a portion of these costs is capitalized into our rate base. The remaining costs are recorded as a component of operation and maintenance expense.

Our fiscal 2018 costs were determined using a September 30, 2017 measurement date. As of September 30, 2017, interest and corporate bond rates were higher than the rates as of September 30, 2016. Therefore, we increased the discount rate used to measure our fiscal 2018 net periodic cost from 3.73 percent to 3.89 percent. We lowered the expected return on plan assets to 6.75 percent in the determination of our fiscal 2018 net periodic pension cost based upon expected market returns for our targeted asset allocation. As a result of the net impact of changes in these and other assumptions, we expect our fiscal 2018 net periodic pension cost to be approximately 25 percent lower than fiscal 2017.

The amount of funding required for our defined benefit plan is determined in accordance with the Pension Protection Act of 2006 (PPA) and is influenced by the funded position of the plan when the funding requirements are determined on January 1 of each year. Based upon the determination as of January 1, 2017, we were not required to make a minimum contribution to our defined benefit plan during fiscal 2018. However, we will consider whether a voluntary contribution is prudent to maintain certain funding levels.

For the six months ended March 31, 2018 we contributed $7.5 million to our postretirement medical plans. We anticipate contributing a total of between $10 million and $20 million to our postretirement plans during fiscal 2018.

The projected pension liability, future funding requirements and the amount of pension expense or income recognized for the plans are subject to change, depending upon the actuarial value of plan assets in the plans and the determination of future benefit obligations as of each subsequent actuarial calculation date. These amounts will be determined by actual investment returns, changes in interest rates, values of assets in the plans and changes in the demographic composition of the participants in the plans.

44

OPERATING STATISTICS AND OTHER INFORMATION

The following tables present certain operating statistics for our distribution and pipeline and storage segments for the three and six-month periods ended March 31, 2018 and 2017.

Distribution Sales and Statistical Data

	Three Months Ended   March 31					Six Months Ended   March 31
	2018			2017		2018			2017
METERS IN SERVICE, end of period
Residential	2,964,137			2,929,455		2,964,137			2,929,455
Commercial	270,795			269,055		270,795			269,055
Industrial	1,673			1,690		1,673			1,690
Public authority and other	8,407			8,332		8,407			8,332
Total meters	3,245,012			3,208,532		3,245,012			3,208,532
INVENTORY STORAGE BALANCE — Bcf	29.7			40.0		29.7			40.0
SALES VOLUMES — MMcf(1)
Gas sales volumes
Residential	80,525			56,931		129,473			98,431
Commercial	40,956			31,739		67,905			55,475
Industrial	9,708			6,708		18,166			14,140
Public authority and other	2,857			2,376		4,809			4,138
Total gas sales volumes	134,046			97,754		220,353			172,184
Transportation volumes	47,843			42,142		87,702			81,207
Total throughput	181,889			139,896		308,055			253,391
OPERATING REVENUES (000’s)(1)
Gas sales revenues
Residential	$	805,134		$	609,771	$	1,361,654		$	1,091,444
Commercial	318,312			251,174		541,892			451,662
Industrial	39,604			47,986		73,017			78,017
Public authority and other	19,008			17,607		32,569			29,716
Total gas sales revenues	1,182,058			926,538		2,009,132			1,650,839
Transportation revenues	29,939			24,307		55,301			46,788
Other gas revenues	(12,706		)	11,696		(4,350		)	19,570
Total operating revenues	$	1,199,291		$	962,541	$	2,060,083		$	1,717,197
Average cost of gas per Mcf sold	$	5.42		$	5.25	$	5.40		$	5.28

See footnote following these tables.

45

Pipeline and Storage Operations Sales and Statistical Data

	Three Months Ended   March 31				Six Months Ended   March 31
	2018		2017		2018		2017
CUSTOMERS, end of period
Industrial	92		91		92		91
Other	231		226		231		226
Total	323		317		323		317
INVENTORY STORAGE BALANCE — Bcf	0.4		0.6		0.4		0.6
PIPELINE TRANSPORTATION VOLUMES — MMcf(1)	237,167		195,233		450,304		382,013
OPERATING REVENUES (000’s)(1)	$	120,955	$	111,972	$	247,418	$	221,924

Note to preceding tables:

⁽¹⁾  Sales volumes and revenues reflect segment operations, including intercompany sales and transportation amounts.

RECENT ACCOUNTING DEVELOPMENTS

Recent accounting developments and their impact on our financial position, results of operations and cash flows are described in Note 2 to the unaudited condensed consolidated financial statements.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Information regarding our quantitative and qualitative disclosures about market risk are disclosed in Item 7A in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. During the six months ended March 31, 2018, there were no material changes in our quantitative and qualitative disclosures about market risk.

Item 4. Controls and Procedures

Management’s Evaluation of Disclosure Controls and Procedures

We carried out an evaluation, under the supervision and with the participation of our management, including our principal executive officer and principal financial officer, of the effectiveness of the Company’s disclosure controls and procedures, as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (Exchange Act). Based on this evaluation, the Company’s principal executive officer and principal financial officer have concluded that the Company’s disclosure controls and procedures were effective as of March 31, 2018 to provide reasonable assurance that information required to be disclosed by us, including our consolidated entities, in the reports that we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified by the SEC’s rules and forms, including a reasonable level of assurance that such information is accumulated and communicated to our management, including our principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

We did not make any changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the second quarter of the fiscal year ended September 30, 2018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

46

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

During the six months ended March 31, 2018, except as noted in Note 9 to the unaudited condensed consolidated financial statements, there were no material changes in the status of the litigation and other matters that were disclosed in Note 11 to our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. We continue to believe that the final outcome of such litigation and other matters or claims will not have a material adverse effect on our financial condition, results of operations or cash flows.

Item 6. Exhibits

The following exhibits are filed as part of this Quarterly Report.

Exhibit Number	Description	Page Number or Incorporation by Reference to
2.1	Membership Interest Purchase Agreement by and between Atmos Energy Holdings, Inc. as Seller and CenterPoint Energy Services, Inc. as Buyer, dated as of October 29, 2016	Exhibit 2.1 to Form 8-K dated October 29, 2016 (File No. 1-10042)
10	Equity Distribution Agreement, dated as of November 14, 2017, among Atmos Energy Corporation, Goldman Sachs & Co. LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated, Morgan Stanley & Co. LLC, and J.P. Morgan Securities LLC	Exhibit 1.1 to Form 8-K dated November 14, 2017 (File No. 1-10042)
12	Computation of ratio of earnings to fixed charges
15	Letter regarding unaudited interim financial information
31	Rule 13a-14(a)/15d-14(a) Certifications
32	Section 1350 Certifications*
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema
101.CAL	XBRL Taxonomy Extension Calculation Linkbase
101.DEF	XBRL Taxonomy Extension Definition Linkbase
101.LAB	XBRL Taxonomy Extension Labels Linkbase
101.PRE	XBRL Taxonomy Extension Presentation Linkbase

* These certifications, which were made pursuant to 18 U.S.C. Section 1350 by the Company’s Chief Executive Officer and Chief Financial Officer, furnished as Exhibit 32 to this Quarterly Report on Form 10-Q, will not be deemed to be filed with the Commission or incorporated by reference into any filing by the Company under the Securities Act of 1933 or the Securities Exchange Act of 1934, except to the extent that the Company specifically incorporates such certifications by reference.

47

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

ATMOS ENERGY CORPORATION

               (Registrant)

By: /s/    CHRISTOPHER T. FORSYTHE

Christopher T. Forsythe

Senior Vice President and Chief Financial Officer

(Duly authorized signatory)

Date: May 2, 2018

48

EX-12

Exhibit 12

Atmos Energy Corporation

Computation of Earnings to Fixed Charges

	Three Months Ended   March 31				Six Months Ended   March 31
	2018		2017		2018		2017
	(Dollars in thousands)
Income from continuing operations before provision for income taxes per statement of income	$	241,431	$	259,061	$	449,448	$	436,955
Add:
Portion of rents representative of the interest factor	3,539		3,029		6,824		6,268
Interest on debt & amortization of debt expense	27,304		26,944		58,813		57,974
Income as adjusted	$	272,274	$	289,034	$	515,085	$	501,197
Fixed charges:
Interest on debt & amortization of debt expense (1)	$	27,304	$	26,944	$	58,813	$	57,974
Capitalized interest (2)	1,206		469		2,749		915
Rents	10,615		9,088		20,471		18,804
Portion of rents representative of the interest factor (3)	3,539		3,029		6,824		6,268
Fixed charges (1)+(2)+(3)	$	32,049	$	30,442	$	68,386	$	65,157
Ratio of earnings to fixed charges	8.50		9.49		7.53		7.69

EX-15

Exhibit 15

Board of Directors

Atmos Energy Corporation

We are aware of the incorporation by reference in the Registration Statements (Form S-3, No. 33-37869; Form S-3, No. 33-58220; Form S-3D/A, No. 33-70212; Form S-3, No. 33-56915; Form S-3/A, No. 333-03339; Form S-3/A, No. 333-32475; Form S-3/A, No. 333-50477; Form S-3, No. 333-95525; Form S-3/A, No. 333-93705; Form S-3, No. 333-75576; Form S-3D, No. 333-113603; Form S-3, No. 333-118706; Form S-3D, No. 333-155666; Form S-3D, No. 333-208317; Form S-3ASR, No. 333-210424; Form S-4, No. 333-13429; Form S-8, No. 33-57687; Form S-8, No. 33-57695; Form S-8, No. 333-32343; Form S-8, No. 333-46337; Form S-8, No. 333-73143; Form S-8, No. 333-73145; Form S-8, No. 333-63738; Form S-8, No. 333-88832; Form S-8, No. 333-116367; Form S-8, No. 333-138209; Form S-8, No. 333-145817; Form S-8, No. 333-155570; Form S-8, No. 333-166639; Form S-8, No. 333-177593; Form S-8, No. 333-199301; Form S-8, No. 333-210461; and Form S-8, No. 333-217739) of Atmos Energy Corporation and in the related Prospectuses of our report dated May 2, 2018, relating to the unaudited condensed consolidated interim financial statements of Atmos Energy Corporation, which are included in its Form 10-Q for the quarter ended March 31, 2018.

/s/ ERNST & YOUNG LLP

Dallas, Texas

May 2, 2018

EX-31

EXHIBIT 31

RULE 13a-14(a)/15d-14(a) CERTIFICATIONS

I, Michael E. Haefner, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Atmos Energy Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and     

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: May 2, 2018

/s/ MICHAEL E. HAEFNER

Michael E. Haefner

President and

Chief Executive Officer

I, Christopher T. Forsythe, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Atmos Energy Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and     

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing equivalent functions):

(a) All significant deficiencies or material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: May 2, 2018

/s/ CHRISTOPHER T. FORSYTHE

Christopher T. Forsythe

Senior Vice President and

Chief Financial Officer

EX-32

Exhibit 32

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

(18 U.S.C. SECTION 1350)

In connection with the Quarterly Report of Atmos Energy Corporation (the “Company”) on Form 10-Q for the second quarter of the fiscal year ended September 30, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Michael E. Haefner, President and Chief Executive Officer of the Company, certify pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

May 2, 2018

/s/ MICHAEL E. HAEFNER

Michael E. Haefner

President and

Chief Executive Officer

A signed original of this written statement has been provided to Atmos Energy Corporation and will be retained by Atmos Energy Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

(18 U.S.C. SECTION 1350)

In connection with the Quarterly Report of Atmos Energy Corporation (the “Company”) on Form 10-Q for the second quarter of the fiscal year ended September 30, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Christopher T. Forsythe, Senior Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

May 2, 2018

/s/ CHRISTOPHER T. FORSYTHE

Christopher T. Forsythe

Senior Vice President and

Chief Financial Officer

A signed original of this written statement has been provided to Atmos Energy Corporation and will be retained by Atmos Energy Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - shares	6 Months Ended
	Mar. 31, 2018	Apr. 27, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	Atmos Energy Corporation
Entity Central Index Key	0000731802
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		111,064,659

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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($)	Mar. 31, 2018	Sep. 30, 2017
ASSETS
Property, plant and equipment	$ 11,903,715,000	$ 11,301,304,000
Less accumulated depreciation and amortization	2,142,386,000	2,042,122,000
Net property, plant and equipment	9,761,329,000	9,259,182,000
Current assets
Cash and cash equivalents	71,074,000	26,409,000
Accounts receivable, net	407,134,000	222,263,000
Gas stored underground	89,265,000	184,653,000
Other current assets	55,263,000	106,321,000
Total current assets	622,736,000	539,646,000
Goodwill	730,132,000	730,132,000
Deferred charges and other assets	242,125,000	220,636,000
Total assets	11,356,322,000	10,749,596,000
Shareholders' equity
Common stock, no par value (stated at $.005 per share)	555,000	531,000
Additional paid-in capital	2,951,545,000	2,536,365,000
Accumulated other comprehensive income (loss)	(85,011,000)	(105,254,000)
Retained earnings	1,854,257,000	1,467,024,000
Shareholders' equity	4,721,346,000	3,898,666,000
Long-term debt	2,617,892,000	3,067,045,000
Total capitalization	7,339,238,000	6,965,711,000
Current liabilities
Accounts payable and accrued liabilities	230,823,000	233,050,000
Other current liabilities	538,702,000	332,648,000
Short-term debt	129,602,000	447,745,000
Current maturities of long-term debt	450,000,000	0
Total current liabilities	1,349,127,000	1,013,443,000
Deferred income taxes	1,107,036,000	1,878,699,000
Regulatory Liability, Excess Deferred Tax	737,798,000	0
Regulatory cost of removal obligation	484,746,000	485,420,000
Pension and postretirement liabilities	237,448,000	230,588,000
Deferred credits and other liabilities	100,929,000	175,735,000
Total shareholders' equity and liabilities	$ 11,356,322,000	$ 10,749,596,000

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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (PARENTHETICALS) - $ / shares	Mar. 31, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Common Stock, No Par Value	$ 0.005	$ 0.005
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Shares, Issued	111,060,328	106,104,634
Common Stock, Shares, Outstanding	111,060,328	106,104,634

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Operating revenues [Abstract]
Operating revenues	$ 1,219,409	$ 988,186	$ 2,108,601	$ 1,768,354
Purchase Gas Cost [Abstract]
Purchased gas cost	626,960	427,494	993,877	738,799
Operation and maintenance expense	161,073	132,239	290,640	257,177
Depreciation and amortization expense	89,381	77,667	177,755	154,625
Taxes, other than income, expense	73,007	65,614	135,780	122,663
Operating income	268,988	285,172	510,549	495,090
Miscellaneous income (expense)	(253)	833	(2,288)	(161)
Interest charges	27,304	26,944	58,813	57,974
Income (loss) from continuing operations before income taxes	241,431	259,061	449,448	436,955
Income tax expense (benefit)	62,439	97,049	(43,676)	160,905
Income from continuing operations	178,992	162,012	493,124	276,050
Gain on sale of discontinued operations, net of tax	0	2,716	0	2,716
Income from discontinued operations, net of tax			0	10,994
Net income (loss)	$ 178,992	$ 164,728	$ 493,124	$ 289,760
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$ 1.60	$ 1.52	$ 4.47	$ 2.61
Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share	0.00	0.03	0.00	0.13
Basic and diluted net income per share	1.60	1.55	4.47	2.74
Cash dividends per share	$ 0.485	$ 0.450	$ 0.97	$ 0.90
Weighted average shares outstanding:
Weighted Average Number of Shares Outstanding, Basic and Diluted	111,706	105,935	110,135	105,610
Distribution Segment [Member]
Operating revenues [Abstract]
Operating revenues	$ 1,199,291	$ 962,541	$ 2,060,083	$ 1,717,197
Purchase Gas Cost [Abstract]
Purchased gas cost	727,053	513,096	1,190,811	908,442
Operation and maintenance expense	131,991	103,703	235,728	196,417
Depreciation and amortization expense	65,649	61,302	131,083	122,459
Taxes, other than income, expense	64,692	57,636	119,799	108,182
Operating income	209,906	226,804	382,662	381,697
Miscellaneous income (expense)	393	1,029	(1,007)	396
Interest charges	16,898	16,925	38,266	38,043
Income (loss) from continuing operations before income taxes	193,401	210,908	343,389	344,050
Income tax expense (benefit)	48,158	79,763	(50,953)	127,541
Income from continuing operations		131,145		216,509
Gain on sale of discontinued operations, net of tax		0		0
Income from discontinued operations, net of tax				0
Net income (loss)	145,243	131,145	394,342	216,509
Pipeline and Storage Segment [Member]
Operating revenues [Abstract]
Operating revenues	120,955	111,972	247,418	221,924
Purchase Gas Cost [Abstract]
Purchased gas cost	433	725	1,345	1,080
Operation and maintenance expense	29,393	28,536	55,533	60,804
Depreciation and amortization expense	23,732	16,365	46,672	32,166
Taxes, other than income, expense	8,315	7,978	15,981	14,481
Operating income	59,082	58,368	127,887	113,393
Miscellaneous income (expense)	(646)	(196)	(1,281)	(557)
Interest charges	10,406	10,019	20,547	19,931
Income (loss) from continuing operations before income taxes	48,030	48,153	106,059	92,905
Income tax expense (benefit)	14,281	17,286	7,277	33,364
Income from continuing operations		30,867		59,541
Gain on sale of discontinued operations, net of tax		0		0
Income from discontinued operations, net of tax				0
Net income (loss)	33,749	30,867	98,782	59,541
Intersegment Elimination [Member]
Operating revenues [Abstract]
Operating revenues	(100,837)	(86,327)	(198,900)	(170,767)
Purchase Gas Cost [Abstract]
Purchased gas cost	(100,526)	(86,327)	(198,279)	(170,723)
Operation and maintenance expense	(311)	0	(621)	(44)
Depreciation and amortization expense	0	0	0	0
Taxes, other than income, expense	0	0	0	0
Operating income	0	0	0	0
Miscellaneous income (expense)	0	0	0	0
Interest charges	0	0	0	0
Income (loss) from continuing operations before income taxes	0	0	0	0
Income tax expense (benefit)	0	0	0	0
Income from continuing operations		0		0
Gain on sale of discontinued operations, net of tax		0		0
Income from discontinued operations, net of tax				0
Net income (loss)	$ 0	$ 0	$ 0	$ 0

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (PARENTHETICALS) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017
Consolidated Statements of Income [Abstract]
Discontinued Operation, Tax Effect of Discontinued Operation		$ 0	$ 6,841
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation	$ 0	$ 0	$ 10,215

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017		Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 178,992	$ 164,728		$ 493,124	$ 289,760
Other comprehensive income (loss), net of tax
Net unrealized holding gains (losses) on available-for-sale securities, net of tax	(939)	1,530		(1,046)	702
Schedule of Other Comprehensive Income (Loss), Cash Flow Hedges [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	22,244	4,230	[1]	21,289	100,426	[1]
Total other comprehensive income (loss)	21,305	5,760		20,243	101,128
Total comprehensive income (loss)	200,297	170,488		513,367	390,888
Interest Rate Contract [Member]
Schedule of Other Comprehensive Income (Loss), Cash Flow Hedges [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	22,244	4,230		21,289	95,444
Commodity Contract [Member]
Schedule of Other Comprehensive Income (Loss), Cash Flow Hedges [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	$ 0	$ 0		$ 0	$ 4,982

[1] Utilizing an income tax rate ranging from 37 percent to 39 percent based on the effective rates in each taxing jurisdiction for the three and six-month period ended March 31, 2017.

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (PARENTHETICALS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Other Comprehensive Income Loss Tax Portion Attributable To Parent Abstract
Unrealized holding gains (losses) on available-for-sale securities, tax	$ (276)	$ 879	$ (338)	$ 403
Interest Rate Contract [Member]
Schedule of Other Comprehensive Income (Loss), Tax, Cash Flow Hedges [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	6,575	2,432	6,026	54,861
Commodity Contract [Member]
Schedule of Other Comprehensive Income (Loss), Tax, Cash Flow Hedges [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	$ 0	$ 0	$ 0	$ 3,183

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows From Operating Activities
Net income	$ 493,124	$ 289,760
Adjustments to reconcile net income to net cash provided by operating activities:
Charged to depreciation and amortization	177,755	154,810
Deferred income taxes	116,023	148,657
One-Time Income Tax Benefit, TCJA	(165,675)	0
Gain on sale of discontinued operations	0	(12,931)
Discontinued cash flow hedging for natural gas marketing commodity contracts	0	(10,579)
Other	12,252	10,391
Net assets / liabilities from risk management activities	812	26,757
Net change in operating assets and liabilities	117,076	(54,862)
Net cash provided by operating activities	751,367	552,003
Cash Flows From Investing Activities
Capital expenditures	(693,978)	(559,385)
Acquisition	0	(85,714)
Proceeds from the sale of discontinued operations	3,000	133,560
Available-for-sale securities activities, net	(1,175)	(8,918)
Other, net	4,009	3,787
Net cash used in investing activities	(688,144)	(516,670)
Cash Flows From Financing Activities
Net increase in short-term debt	(318,143)	(159,204)
Net proceeds from equity offering	395,092	49,400
Issuance of common stock through stock purchase and employee retirement plans	11,902	16,984
Proceeds from issuance of long-term debt, net of discount	0	125,000
Interest rate agreements cash collateral	0	25,670
Cash dividends paid	(105,891)	(95,314)
Repurchase of equity awards	(1,518)	0
Net cash provided by (used in) financing activities	(18,558)	(37,464)
Net increase (decrease) in cash and cash equivalents	44,665	(2,131)
Cash and cash equivalents at beginning of period	26,409	47,534
Cash and cash equivalents at end of period	$ 71,074	$ 45,403

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Nature of Business

6 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of Business

Nature of Business

Atmos Energy Corporation (“Atmos Energy” or the “Company”) is engaged in the regulated natural gas distribution and pipeline and storage businesses. Our distribution business is subject to federal and state regulation and/or regulation by local authorities in each of the states in which our regulated divisions and subsidiaries operate.

Our distribution business delivers natural gas through sales and transportation arrangements to over three million residential, commercial, public authority and industrial customers through our six regulated distribution divisions, which at March 31, 2018, covered service areas located in eight states.

Our pipeline and storage business, which is also subject to federal and state regulations, includes the transportation of natural gas to our Texas and Louisiana distribution systems and the management of our underground storage facilities used to support our distribution business in various states.

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Unaudited Financial Information

6 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Unaudited Financial Information

Unaudited Financial Information

These consolidated interim-period financial statements have been prepared in accordance with accounting principles generally accepted in the United States on the same basis as those used for the Company’s audited consolidated financial statements included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. In the opinion of management, all material adjustments (consisting of normal recurring accruals) necessary for a fair presentation have been made to the unaudited consolidated interim-period financial statements. These consolidated interim-period financial statements are condensed as permitted by the instructions to Form 10-Q and should be read in conjunction with the audited consolidated financial statements of Atmos Energy Corporation included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. Because of seasonal and other factors, the results of operations for the six-month period ended March 31, 2018 are not indicative of our results of operations for the full 2018 fiscal year, which ends September 30, 2018.

Except for the filed formula rate mechanisms as discussed in Note 9, no events have occurred subsequent to the balance sheet date that would require recognition or disclosure in the condensed consolidated financial statements.

Significant accounting policies

Our accounting policies are described in Note 2 to the consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017.

During the second quarter of fiscal 2018, we completed our annual goodwill impairment assessment using a qualitative assessment, as permitted under U.S. GAAP. We test goodwill for impairment at the reporting unit level on an annual basis and between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of the reporting unit. Based on the assessment performed, we determined that our goodwill was not impaired.

In May 2014, the Financial Accounting Standards Board (FASB) issued a comprehensive new revenue recognition standard that will supersede virtually all existing revenue recognition guidance under generally accepted accounting principles in the United States. Under the new standard, an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies may need to use more judgment and make more estimates than under current guidance. The new guidance will become effective for us October 1, 2018 and can be applied either retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption.

As of March 31, 2018, we had substantially completed the evaluation of our sources of revenue and the impact that the new guidance will have on our financial position, results of operations, cash flows and business processes. Based on this evaluation, we currently do not believe the implementation of the new guidance will have a material effect on our financial position, results of operations, cash flows or business processes. We expect to apply the new guidance using the modified retrospective method on the date of adoption. We are currently still evaluating the impact on our financial statement presentation and related disclosures.

In January 2016, the FASB issued guidance related to the classification and measurement of financial instruments. The amendments modify the accounting and presentation for certain financial liabilities and equity investments not consolidated or reported using the equity method. The guidance is effective for us beginning October 1, 2018; limited early adoption is permitted. We are currently evaluating the potential impact of this new guidance on our financial position, results of operations and cash flows.

In February 2016, the FASB issued a comprehensive new leasing standard that will require lessees to recognize a lease liability and a right-of-use asset for all leases, including operating leases, with a term greater than 12 months on its balance sheet. The new standard will be effective for us beginning on October 1, 2019; early adoption is permitted. The new leasing standard requires modified retrospective transition, which requires application of the new guidance at the beginning of the earliest comparative period presented in the year of adoption. Additionally, in January 2018, the FASB issued amendments to the standard that provides a practical expedient for entities to not evaluate existing or expired land easements that were not previously accounted for as leases under the current guidance. We are currently evaluating the effect of this standard and amendments on our financial position, results of operations and cash flows.

In June 2016, the FASB issued new guidance which will require credit losses on most financial assets measured at amortized cost and certain other instruments to be measured using an expected credit loss model. Under this model, entities will estimate credit losses over the entire contractual term of the instrument from the date of initial recognition of that instrument. In contrast, current U.S. GAAP is based on an incurred loss model that delays recognition of credit losses until it is probable the loss has been incurred. The new guidance also introduces a new impairment recognition model for available-for-sale securities that will require credit losses for available-for-sale debt securities to be recorded through an allowance account. The new standard will be effective for us beginning on October 1, 2021; early adoption is permitted beginning on October 1, 2019. We are currently evaluating the potential impact of this new guidance on our financial position, results of operations and cash flows. 

In January 2017, the FASB issued new guidance that simplifies the accounting for goodwill impairments by eliminating step 2 from the goodwill impairment test. Under the new guidance, if the carrying amount of a reporting unit exceeds its fair value, an impairment loss will be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. The new standard will be effective for our fiscal 2021 goodwill impairment test; however, early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. We early adopted the new standard, effective for our goodwill impairment test performed in our second fiscal quarter of 2018. The new standard did not have a material impact on our results of operations, consolidated balance sheets or cash flows. 

In March 2017, the FASB issued new guidance related to the income statement presentation of the components of net periodic benefit cost for an entity’s sponsored defined benefit pension and other postretirement plans. The new guidance requires entities to disaggregate the current service cost component of the net benefit cost from the other components and present it with other current compensation costs for related employees in the statement of income. The other components of net benefit cost will be presented outside of income from operations on the statement of income. In addition, only the service cost component of net benefit cost is eligible for capitalization (e.g., as part of inventory or property, plant, and equipment). The Federal Energy Regulatory Commission (“FERC”), which regulates interstate transmission pipelines and also establishes, through its Uniform System of Accounts, accounting practices of rate-regulated entities, has issued guidance that states it will permit an election to either continue to capitalize non-service benefit costs or to cease capitalizing such costs for regulatory purposes.  Accounting guidelines by the FERC are typically also upheld by state commissions.  As such, we plan to continue to capitalize all components of net periodic benefit cost for ratemaking purposes and will defer the non-service cost components as a regulatory asset for U.S. GAAP reporting purposes. The new guidance will be effective for us in the fiscal year beginning on October 1, 2018 and for interim periods within that year.  The standard requires retrospective application of the amendment related to the presentation of non-service cost components outside of income from operations in the statement of income and prospective application of the change in eligible costs for capitalization. We do not anticipate the new standard will have a material impact on our financial position, results of operations and cash flows.

In February 2018, the FASB issued new guidance as a result of the Tax Cuts and Jobs Act of 2017 (the "TCJA"), related to the treatment of certain tax effects from accumulated other comprehensive income. The new guidance allows entities to reclassify from accumulated other comprehensive income to retained earnings the stranded tax effects resulting from the adoption of the TCJA. The new guidance will be effective for us in the fiscal year beginning on October 1, 2019 and for interim periods within that year. Early adoption is permitted, including adoption in any interim period for public business entities for reporting periods for which financial statements have not yet been issued and should be applied either in the period of adoption or retrospectively to each period (or periods) in which the effect of the change in the U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act is recognized. We are currently evaluating the impact of this new guidance on our financial results and disclosures.

Regulatory assets and liabilities

Accounting principles generally accepted in the United States require cost-based, rate-regulated entities that meet certain criteria to reflect the authorized recovery of costs due to regulatory decisions in their financial statements. As a result, certain costs are permitted to be capitalized rather than expensed because they can be recovered through rates. We record certain costs as regulatory assets when future recovery through customer rates is considered probable. Regulatory liabilities are recorded when it is probable that revenues will be reduced for amounts that will be credited to customers through the ratemaking process. Substantially all of our regulatory assets are recorded as a component of deferred charges and other assets and a portion of our regulatory liabilities are recorded as a component of deferred credits and other liabilities. Deferred gas costs are recorded either in other current assets or liabilities and our regulatory excess deferred taxes and regulatory cost of removal obligation is reported separately.

Significant regulatory assets and liabilities as of March 31, 2018 and September 30, 2017 included the following:

	March 31, 2018		September 30, 2017
	(In thousands)
Regulatory assets:
Pension and postretirement benefit costs(1)	$	20,918	$	26,826
Infrastructure mechanisms(2)	65,286		46,437
Deferred gas costs	—		65,714
Recoverable loss on reacquired debt	9,954		11,208
Deferred pipeline record collection costs	14,646		11,692
APT annual adjustment mechanism	—		2,160
Rate case costs	3,016		2,629
Other	8,064		10,132
	$	121,884	$	176,798
Regulatory liabilities:
Regulatory excess deferred taxes(3)	$	737,798	$	—
Regulatory cost of service reserve(4)	29,042		—
Regulatory cost of removal obligation	526,483		521,330
Deferred gas costs	167,036		15,559
Asset retirement obligation	12,827		12,827
APT annual adjustment mechanism	5,081		—
Other	14,740		5,941
	$	1,493,007	$	555,657

(1) Includes $7.8 million and $9.4 million of pension and postretirement expense deferred pursuant to regulatory authorization.

(2) Infrastructure mechanisms in Texas and Louisiana allow for the deferral of all eligible expenses associated with capital expenditures incurred pursuant to these rules, including the recording of interest on deferred expenses until the next rate proceeding (rate case or annual rate filing), at which time investment and costs would be recoverable through base rates.

(3) The TCJA resulted in the remeasurement of the net deferred tax liability included in our rate base. The excess deferred taxes will be returned to utility customers in accordance with regulatory requirements. See Note 6 for further information.

(4) Effective January 1, 2018, regulators in each of our service areas required us to establish a regulatory liability for the difference in recoverable federal taxes included in revenues based on the former 35% federal statutory rate and the new 21% federal statutory rate for service provided on or after January 1, 2018. This liability will be returned to utility customers in accordance with regulatory requirements. See Note 6 for further information.

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Segment Information

6 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

Segment Information

 We manage and review our consolidated operations through the following reportable segments:

• The distribution segment is primarily comprised of our regulated natural gas distribution and related sales operations in eight states.

• The pipeline and storage segment is comprised primarily of the pipeline and storage operations of our Atmos Pipeline-Texas division and our natural gas transmission operations in Louisiana.

• Thenatural gas marketing segment was comprised of our discontinued natural gas marketing business.

Our determination of reportable segments considers the strategic operating units under which we manage sales of various products and services to customers in differing regulatory environments. Although our distribution segment operations are geographically dispersed, they are aggregated and reported as a single segment as each natural gas distribution division has similar economic characteristics. In addition, because the pipeline and storage operations of our Atmos Pipeline-Texas division and our natural gas transmission operations in Louisiana have similar economic characteristics, they have been aggregated and reported as a single segment.

The accounting policies of the segments are the same as those described in the summary of significant accounting policies found in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. We evaluate performance based on net income or loss of the respective operating units. We allocate interest and pension expense to the pipeline and storage segment; however, there is no debt or pension liability recorded on the pipeline and storage segment balance sheet. All material intercompany transactions have been eliminated; however, we have not eliminated intercompany profits when such amounts are probable of recovery under the affiliates’ rate regulation process. Income taxes are allocated to each segment as if each segment’s taxes were calculated on a separate return basis.

Income statements and capital expenditures for the three and six months endedMarch 31, 2018 and 2017 by segment are presented in the following tables:

	Three Months Ended March 31, 2018
	Distribution		Pipeline and Storage			Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	1,198,309	$	21,100		$	—		$	1,219,409
Intersegment revenues	982		99,855			(100,837		)	—
Total operating revenues	1,199,291		120,955			(100,837		)	1,219,409
Purchased gas cost	727,053		433			(100,526		)	626,960
Operation and maintenance expense	131,991		29,393			(311		)	161,073
Depreciation and amortization expense	65,649		23,732			—			89,381
Taxes, other than income	64,692		8,315			—			73,007
Operating income	209,906		59,082			—			268,988
Miscellaneous income (expense)	393		(646		)	—			(253		)
Interest charges	16,898		10,406			—			27,304
Income before income taxes	193,401		48,030			—			241,431
Income tax expense	48,158		14,281			—			62,439
Net income	$	145,243	$	33,749		$	—		$	178,992
Capital expenditures	$	224,235	$	86,505		$	—		$	310,740

	Three Months Ended March 31, 2017
	Distribution		Pipeline and Storage			Natural Gas Marketing		Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	962,217	$	25,969		$	—	$	—		$	988,186
Intersegment revenues	324		86,003			—		(86,327		)	—
Total operating revenues	962,541		111,972			—		(86,327		)	988,186
Purchased gas cost	513,096		725			—		(86,327		)	427,494
Operation and maintenance expense	103,703		28,536			—		—			132,239
Depreciation and amortization expense	61,302		16,365			—		—			77,667
Taxes, other than income	57,636		7,978			—		—			65,614
Operating income	226,804		58,368			—		—			285,172
Miscellaneous income (expense)	1,029		(196		)	—		—			833
Interest charges	16,925		10,019			—		—			26,944
Income from continuing operations before income taxes	210,908		48,153			—		—			259,061
Income tax expense	79,763		17,286			—		—			97,049
Income from continuing operations	131,145		30,867			—		—			162,012
Gain on sale of discontinued operations, net of tax	—		—			2,716		—			2,716
Net income	$	131,145	$	30,867		$	2,716	$	—		$	164,728
Capital expenditures	$	208,185	$	53,238		$	—	$	—		$	261,423

	Six Months Ended March 31, 2018
	Distribution			Pipeline and Storage			Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	2,058,762		$	49,839		$	—		$	2,108,601
Intersegment revenues	1,321			197,579			(198,900		)	—
Total operating revenues	2,060,083			247,418			(198,900		)	2,108,601
Purchased gas cost	1,190,811			1,345			(198,279		)	993,877
Operation and maintenance expense	235,728			55,533			(621		)	290,640
Depreciation and amortization expense	131,083			46,672			—			177,755
Taxes, other than income	119,799			15,981			—			135,780
Operating income	382,662			127,887			—			510,549
Miscellaneous expense	(1,007		)	(1,281		)	—			(2,288		)
Interest charges	38,266			20,547			—			58,813
Income before income taxes	343,389			106,059			—			449,448
Income tax (benefit) expense	(50,953		)	7,277			—			(43,676		)
Net income	$	394,342		$	98,782		$	—		$	493,124
Capital expenditures	$	465,484		$	228,494		$	—		$	693,978

	Six Months Ended March 31, 2017
	Distribution		Pipeline and Storage			Natural Gas Marketing		Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	1,716,483	$	51,871		$	—	$	—		$	1,768,354
Intersegment revenues	714		170,053			—		(170,767		)	—
Total operating revenues	1,717,197		221,924			—		(170,767		)	1,768,354
Purchased gas cost	908,442		1,080			—		(170,723		)	738,799
Operation and maintenance expense	196,417		60,804			—		(44		)	257,177
Depreciation and amortization expense	122,459		32,166			—		—			154,625
Taxes, other than income	108,182		14,481			—		—			122,663
Operating income	381,697		113,393			—		—			495,090
Miscellaneous income (expense)	396		(557		)	—		—			(161		)
Interest charges	38,043		19,931			—		—			57,974
Income from continuing operations before income taxes	344,050		92,905			—		—			436,955
Income tax expense	127,541		33,364			—		—			160,905
Income from continuing operations	216,509		59,541			—		—			276,050
Income from discontinued operations, net of tax	—		—			10,994		—			10,994
Gain on sale of discontinued operations, net of tax	—		—			2,716		—			2,716
Net income	$	216,509	$	59,541		$	13,710	$	—		$	289,760
Capital expenditures	$	430,669	$	128,716		$	—	$	—		$	559,385

Balance sheet information at March 31, 2018 and September 30, 2017 by segment is presented in the following tables:

	March 31, 2018
	Distribution		Pipeline and Storage		Eliminations			Consolidated
	(In thousands)
Property, plant and equipment, net	$	7,202,673	$	2,558,656	$	—		$	9,761,329
Total assets	$	10,723,398	$	2,779,330	$	(2,146,406	)	$	11,356,322

	September 30, 2017
	Distribution		Pipeline and Storage		Eliminations			Consolidated
	(In thousands)
Property, plant and equipment, net	$	6,849,517	$	2,409,665	$	—		$	9,259,182
Total assets	$	10,050,164	$	2,621,601	$	(1,922,169	)	$	10,749,596

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Earnings Per Share

6 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

We use the two-class method of computing earnings per share because we have participating securities in the form of non-vested restricted stock units with a nonforfeitable right to dividend equivalents, for which vesting is predicated solely on the passage of time. The calculation of earnings per share using the two-class method excludes income attributable to these participating securities from the numerator and excludes the dilutive impact of those shares from the denominator. Basic and diluted earnings per share for the three and six months ended March 31, 2018 and 2017 are calculated as follows:

	Three Months Ended   March 31				Six Months Ended   March 31
	2018		2017		2018		2017
	(In thousands, except per share amounts)
Basic and Diluted Earnings Per Share from continuing operations
Income from continuing operations	$	178,992	$	162,012	$	493,124	$	276,050
Less: Income from continuing operations allocated to participating securities	161		193		459		348
Income from continuing operations available to common shareholders	$	178,831	$	161,819	$	492,665	$	275,702
Basic and diluted weighted average shares outstanding	111,706		105,935		110,135		105,610
Income from continuing operations per share — Basic and Diluted	$	1.60	$	1.52	$	4.47	$	2.61
Basic and Diluted Earnings Per Share from discontinued operations
Income from discontinued operations	$	—	$	2,716	$	—	$	13,710
Less: Income from discontinued operations allocated to participating securities	—		2		—		15
Income from discontinued operations available to common shareholders	$	—	$	2,714	$	—	$	13,695
Basic and diluted weighted average shares outstanding	111,706		105,935		110,135		105,610
Income from discontinued operations per share — Basic and Diluted	$	—	$	0.03	$	—	$	0.13
Net income per share — Basic and Diluted	$	1.60	$	1.55	$	4.47	$	2.74

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Debt

6 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

Debt

The nature and terms of our debt instruments and credit facilities are described in detail in Note 5 to the consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. There were no material changes in the terms of our debt instruments during the six months ended March 31, 2018.

Long-term debt at March 31, 2018 and September 30, 2017 consisted of the following:

	March 31, 2018			September 30, 2017
	(In thousands)
Unsecured 8.50% Senior Notes, due March 2019	$	450,000		$	450,000
Unsecured 3.00% Senior Notes, due 2027	500,000			500,000
Unsecured 5.95% Senior Notes, due 2034	200,000			200,000
Unsecured 5.50% Senior Notes, due 2041	400,000			400,000
Unsecured 4.15% Senior Notes, due 2043	500,000			500,000
Unsecured 4.125% Senior Notes, due 2044	750,000			750,000
Medium-term note Series A, 1995-1, 6.67%, due 2025	10,000			10,000
Unsecured 6.75% Debentures, due 2028	150,000			150,000
Floating-rate term loan, due September 2019(1)	125,000			125,000
Total long-term debt	3,085,000			3,085,000
Less:
Original issue premium / discount on unsecured senior notes and debentures	(4,412		)	(4,384		)
Debt issuance cost	21,520			22,339
Current maturities	450,000			—
	$	2,617,892		$	3,067,045

(1) Up to $200 million can be drawn under this term loan.

We utilize short-term debt to provide cost-effective, short-term financing until it can be replaced with a balance of long-term debt and equity financing that achieves the Company’s desired capital structure with an equity-to-total-capitalization ratio between 50% and 60%, inclusive of long-term and short-term debt. Our short-term borrowing requirements are affected primarily by the seasonal nature of the natural gas business. Changes in the price of natural gas and the amount of natural gas we need to supply our customers’ needs could significantly affect our borrowing requirements. Our short-term borrowings typically reach their highest levels in the winter months.

Currently, our short-term borrowing requirements are satisfied through a combination of a $1.5 billion commercial paper program and three committed revolving credit facilities with third-party lenders that provide approximately $1.5 billion of total working capital funding. The primary source of our funding is our commercial paper program, which is supported by a five-year unsecured $1.5 billion credit facility. On March 26, 2018, we executed one of our two one-year extension options which extended the maturity date from September 25, 2021 to September 25, 2022. The facility bears interest at a base rate or at a LIBOR-based rate for the applicable interest period, plus a spread ranging from zero percent to 1.25 percent, based on the Company’s credit ratings. Additionally, the facility contains a $250 million accordion feature, which provides the opportunity to increase the total committed loan to $1.75 billion. At March 31, 2018 and September 30, 2017, a total of $129.6 million and $447.7 million was outstanding under our commercial paper program.

Additionally, we have a $25 million 364-day unsecured facility, which was renewed effective April 1, 2018 and expires March 31, 2019, and a $10 million 364-day unsecured revolving credit facility, which is used primarily to issue letters of credit. At March 31, 2018, there were no borrowings outstanding under either of these facilities; however, outstanding letters of credit reduced the total amount available to us under our $10 million facility to $4.4 million.

The availability of funds under these credit facilities is subject to conditions specified in the respective credit agreements, all of which we currently satisfy. These conditions include our compliance with financial covenants and the continued accuracy of representations and warranties contained in these agreements. We are required by the financial covenants in each of these facilities to maintain, at the end of each fiscal quarter, a ratio of total-debt-to-total-capitalization of no greater than 70 percent. At March 31, 2018, our total-debt-to-total-capitalization ratio, as defined in the agreements, was 41 percent. In addition, both the interest margin and the fee that we pay on unused amounts under certain of these facilities are subject to adjustment depending upon our credit ratings.

These credit facilities and our public indentures contain usual and customary covenants for our business, including covenants substantially limiting liens, substantial asset sales and mergers. Additionally, our public debt indentures relating to our senior notes and debentures, as well as certain of our revolving credit agreements, each contain a default provision that is triggered if outstanding indebtedness arising out of any other credit agreements in amounts ranging from in excess of $15 million to in excess of $100 million becomes due by acceleration or is not paid at maturity. We were in compliance with all of our debt covenants as of March 31, 2018. If we were unable to comply with our debt covenants, we would likely be required to repay our outstanding balances on demand, provide additional collateral or take other corrective actions.

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Tax Cuts and Jobs Act of 2017 Impacts

6 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

Tax Cuts and Jobs Act of 2017

On December 22, 2017, the Tax Cuts and Jobs Act of 2017 (the "TCJA") was signed into law. The TCJA introduced several significant changes to corporate income tax laws in the United States. The most significant change that affects Atmos Energy is the reduction of the federal statutory income tax rate from 35% to 21%. As a rate-regulated entity, the accelerated capital expensing and the limitation on interest deductibility provisions included in the TCJA are not applicable to us.

Under generally accepted accounting principles, we use the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled.

At September 30, 2017, we measured our net deferred tax liability using the enacted federal statutory tax rate of 35%. The enactment of the TCJA on December 22, 2017 required us to remeasure our deferred tax assets and liabilities, including our U.S. federal income tax net operating loss carryforwards, at the newly enacted federal statutory income tax rate. As the Company’s fiscal year end is September 30, the Internal Revenue Code requires the Company to use a blended statutory federal corporate income tax rate of 24.5% for fiscal 2018.

The decrease in the federal statutory income tax rate reduced our net deferred tax liability by $903.5 million. Of this amount, $737.8 million relates to regulated operations and has been recorded as a regulatory liability, which will be returned to utility customers. The period and timing of these revenue adjustments are subject to Internal Revenue Code provisions and regulatory actions in each of the eight states in which we operate. The remaining $165.7 million has been reflected as a one-time income tax benefit in our condensed consolidated statement of income for the six months ended March 31, 2018, because these taxes were not considered in our cost of service ratemaking. During the three months ended March 31, 2018, we refined the calculations performed to remeasure the Company's net deferred tax liabilities, which resulted in the recognition of a $3.8 million income tax benefit.

At March 31, 2018, we had $274.7 million of remeasured federal net operating loss carryforwards. The federal net operating loss carryforwards are available to offset future taxable income and will begin to expire in 2029. The Company also has $10.1 million of federal alternative minimum tax credit carryforwards that do not expire and are expected to be fully refunded to us between 2019 and 2022 as a result of changes introduced by the TCJA. These credit carryforwards are now reflected as taxes receivable within the deferred charges and other assets line item on our condensed consolidated balance sheet. In addition, the Company has $5.2 million in remeasured charitable contribution carryforwards to offset future taxable income. The Company’s charitable contribution carryforwards expire between 2018 and 2023.

The Company also has $21.5 million of state net operating loss carryforwards and $1.5 million of state tax credit carryforwards (net of $5.7 million and $0.4 million of remeasured federal effects). Depending on the jurisdiction in which the state net operating loss was generated, the carryforwards will begin to expire between 2018 and 2032.

Due to the changes introduced by the TCJA, we now believe it is more likely than not that the benefit from certain charitable contribution carryforwards for which a valuation allowance was previously established will be realized. As a result, we reduced our valuation allowance by $4.2 million during the first quarter. This amount is included in the $165.7 million one-time income tax benefit.

The SEC issued guidance in Staff Accounting Bulletin 118 (SAB 118), which allows us to record provisional amounts during a one-year measurement period, similar to the measurement period in accounting for business combinations. The Company has determined a reasonable estimate for the measurement and accounting for certain effects of the TCJA, including the remeasurement of our net deferred tax liabilities and the establishment of a regulatory liability, which have been reflected as provisional amounts in the March 31, 2018 condensed consolidated financial statements and are described in further detail above. The amounts represent our best estimates based upon records, information and current guidance. We are still analyzing certain aspects of the TCJA, refining our calculations and expecting additional guidance relating to the TCJA from the U.S. Department of the Treasury and the Internal Revenue Service.  Any additional guidance issued or future actions of our regulators could potentially affect the final determination of the accounting effects arising from the implementation of the TCJA.

We are actively working with our regulators in each jurisdiction to address the impact of the TCJA on our cost of service based rates. Accounting orders have been issued for all our service areas that required us to establish, effective January 1, 2018, a separate regulatory liability for the difference in taxes included in our rates that have been calculated based on a 35% statutory income tax rate and the new 21% statutory income tax rate. The establishment of this regulatory liability relating to our cost of service rates resulted in a reduction to our revenues beginning in the second quarter of fiscal 2018. The period and timing of the return of these liabilities to utility customers will be determined by regulators in each of our jurisdictions.

During the fiscal 2018 second quarter, we received approval from regulators to update our cost of service rates to reflect the decrease in the statutory income tax rate in our Colorado, Kansas, Kentucky and Texas service areas. The return to customers of regulatory liabilities recorded for differences in our cost of service rates due to the change in the federal statutory income tax rate and the excess deferred taxes created upon implementation of the TCJA will be addressed in future regulatory proceedings. We are still working with regulators in Louisiana, Mississippi, Tennessee and Virginia to reflect the effects of the TCJA in our cost of service in rates.

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Shareholders' Equity

6 Months Ended

Mar. 31, 2018

Equity [Abstract]

Shareholders' Equity

Shareholders' Equity

Shelf Registration, At-the-Market Equity Sales Program and Equity Issuance

On March 28, 2016, we filed a registration statement with the Securities and Exchange Commission (SEC) that originally permitted us to issue, from time to time, up to $2.5 billion in common stock and/or debt securities, which expires March 28, 2019. At March 31, 2018, approximately $1.2 billion of securities remained available for issuance under the shelf registration statement.

On November 14, 2017, we filed a prospectus supplement under the registration statement relating to an at-the-market (ATM) equity sales program under which we may issue and sell shares of our common stock up to an aggregate offering price of $500 million, which expires March 28, 2019. During the six months ended March 31, 2018, no shares of common stock were sold under the ATM program.

On November 30, 2017, we filed a prospectus supplement under the registration statement relating to an underwriting agreement to sell 4,558,404 shares of our common stock. We received aggregate gross proceeds of $400 million and received net proceeds, after expenses, of $395.1 million from the offering.

Accumulated Other Comprehensive Income (Loss)

We record deferred gains (losses) in AOCI related to available-for-sale securities, interest rate cash flow hedges and prior to the sale of Atmos Energy Marketing, LLC (AEM) on January 3, 2017, commodity contract cash flow hedges. Deferred gains (losses) for our available-for-sale securities and commodity contract cash flow hedges are recognized in earnings upon settlement, while deferred gains (losses) related to our interest rate agreement cash flow hedges are recognized in earnings as they are amortized. The following tables provide the components of our accumulated other comprehensive income (loss) balances, net of the related tax effects allocated to each component of other comprehensive income (loss):

	Available- for-Sale Securities			Interest Rate Agreement Cash Flow Hedges			Total
	(In thousands)
September 30, 2017	$	7,048		$	(112,302	)	$	(105,254	)
Other comprehensive income (loss) before reclassifications	(167		)	20,454			20,287
Amounts reclassified from accumulated other comprehensive income	(879		)	835			(44		)
Net current-period other comprehensive income (loss)	(1,046		)	21,289			20,243
March 31, 2018	$	6,002		$	(91,013	)	$	(85,011	)

	Available- for-Sale Securities		Interest Rate Agreement Cash Flow Hedges			Commodity Contracts Cash Flow Hedges			Total
	(In thousands)
September 30, 2016	$	4,484	$	(187,524	)	$	(4,982	)	$	(188,022	)
Other comprehensive income before reclassifications	634		95,271			9,847			105,752
Amounts reclassified from accumulated other comprehensive income	68		173			(4,865		)	(4,624		)
Net current-period other comprehensive income	702		95,444			4,982			101,128
March 31, 2017	$	5,186	$	(92,080	)	$	—		$	(86,894	)

The following tables detail reclassifications out of AOCI for the three and six months ended March 31, 2018 and 2017. Amounts in parentheses below indicate decreases to net income in the statement of income:

	Three Months Ended March 31, 2018
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement of Income
	(In thousands)
Available-for-sale securities	$	1,139		Operation and maintenance expense
	1,139			Total before tax
	(260		)	Tax expense
	$	879		Net of tax
Cash flow hedges
Interest rate agreements	$	(593	)	Interest charges
	(593		)	Total before tax
	135			Tax benefit
	$	(458	)	Net of tax
Total reclassifications	$	421		Net of tax

	Three Months Ended March 31, 2017
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement of Income
	(In thousands)
Available-for-sale securities	$	(107	)	Operation and maintenance expense
	(107		)	Total before tax
	39			Tax benefit
	$	(68	)	Net of tax
Cash flow hedges
Interest rate agreements	$	(136	)	Interest charges
	(136		)	Total before tax
	50			Tax benefit
	$	(86	)	Net of tax
Total reclassifications	$	(154	)	Net of tax

	Six Months Ended March 31, 2018
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in  the Statement of Income
	(In thousands)
Available-for-sale securities	$	1,139		Operation and maintenance expense
	1,139			Total before tax
	(260		)	Tax expense
	$	879		Net of tax
Cash flow hedges
Interest rate agreements	$	(1,187	)	Interest charges
	(1,187		)	Total before tax
	352			Tax benefit
	$	(835	)	Net of tax
Total reclassifications	$	44		Net of tax

	Six Months Ended March 31, 2017
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in  the Statement of Income
	(In thousands)
Available-for-sale securities	$	(107	)	Operation and maintenance expense
	(107		)	Total before tax
	39			Tax benefit
	$	(68	)	Net of tax
Cash flow hedges
Interest rate agreements	$	(273	)	Interest charges
Commodity contracts	7,967			Purchased gas cost(1)
	7,694			Total before tax
	(3,002		)	Tax expense
	$	4,692		Net of tax
Total reclassifications	$	4,624		Net of tax

(1) Amount is presented as part of income from discontinued operations in the condensed consolidated statement of income.

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Interim Pension and Other Postretirement Benefit Plan Information

6 Months Ended

Mar. 31, 2018

Retirement Benefits, Description [Abstract]

Interim Pension and Postretirement Benefit Plans

Interim Pension and Other Postretirement Benefit Plan Information

The components of our net periodic pension cost for our pension and other postretirement benefit plans for the three and six months endedMarch 31, 2018 and 2017 are presented in the following tables. Most of these costs are recoverable through our tariff rates; however, a portion of these costs is capitalized into our rate base. The remaining costs are recorded as a component of operation and maintenance expense. In the second quarter of fiscal 2018, due to the retirement of certain executives, we recognized a settlement loss of $2.4 million associated with our Supplemental Executive Retirement Plan and revalued the net periodic pension cost for the remainder of fiscal 2018. The revaluation of the net periodic pension cost for our Supplemental Executive Retirement Plan resulted in an increase in the discount rate, effective March 1, 2018, to 4.12%, which will increase our net periodic pension cost by approximately $0.1 million for the remainder of the fiscal year.

	Three Months Ended March 31
	Pension Benefits						Other Benefits
	2018			2017			2018			2017
	(In thousands)
Components of net periodic pension cost:
Service cost	$	4,575		$	5,217		$	3,019		$	3,109
Interest cost	6,433			6,297			2,727			2,670
Expected return on assets	(6,916		)	(6,994		)	(2,001		)	(1,797		)
Amortization of prior service cost (credit)	(58		)	(58		)	3			(411		)
Amortization of actuarial (gain) loss	3,085			4,249			(1,619		)	(707		)
Settlements	2,415			—			—			—
Net periodic pension cost	$	9,534		$	8,711		$	2,129		$	2,864

	Six Months Ended March 31
	Pension Benefits						Other Benefits
	2018			2017			2018			2017
	(In thousands)
Components of net periodic pension cost:
Service cost	$	9,135		$	10,433		$	6,039		$	6,218
Interest cost	12,863			12,594			5,454			5,340
Expected return on assets	(13,833		)	(13,988		)	(4,003		)	(3,593		)
Amortization of prior service cost (credit)	(116		)	(116		)	6			(822		)
Amortization of actuarial (gain) loss	6,174			8,498			(3,237		)	(1,414		)
Settlements	2,415			—			—			—
Net periodic pension cost	$	16,638		$	17,421		$	4,259		$	5,729

The assumptions used to develop our net periodic pension cost for the three and six months endedMarch 31, 2018 and 2017 are as follows:

	Supplemental Executive Retirement Plan		Pension Benefits		Other Benefits
	2018	2017	2018	2017	2018	2017
Discount rate	4.12%	3.73%	3.89%	3.73%	3.89%	3.73%
Rate of compensation increase	3.50%	3.50%	3.50%	3.50%	N/A	N/A
Expected return on plan assets	N/A	N/A	6.75%	7.00%	4.29%	4.45%

The discount rate used to compute the present value of a plan’s liabilities generally is based on rates of high-grade corporate bonds with maturities similar to the average period over which the benefits will be paid. Generally, our funding policy has been to contribute annually an amount in accordance with the requirements of the Employee Retirement Income Security Act of 1974. In accordance with the Pension Protection Act of 2006 (PPA), we determined the funded status of our plan as of January 1, 2017. Based on that determination, we are not required to make a minimum contribution to our defined benefit plan during fiscal 2018; however, we may consider whether a voluntary contribution is prudent to maintain certain funding levels.

We contributed $7.5 million to our other post-retirement benefit plans during the six months ended March 31, 2018. We expect to contribute a total of between $10 million and $20 million to these plans during fiscal 2018.

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Commitments and Contingencies

6 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Litigation and Environmental Matters

In the normal course of business, we are subject to various legal and regulatory proceedings. For such matters, we record liabilities when they are considered probable and estimable, based on currently available facts, our historical experience, and our estimates of the ultimate outcome or resolution of the liability in the future. While the outcome of these proceedings is uncertain and a loss in excess of the amount we have accrued is possible though not reasonably estimable, it is the opinion of management that any amounts exceeding the accruals will not have a material adverse impact on our financial position, results of operations, or cash flows.

We maintain liability insurance for various risks associated with the operation of our natural gas pipelines and facilities, including for property damage and bodily injury. These liability insurance policies generally require us to be responsible for the first $1.0 million (self-insured retention) of each incident.

The National Transportation Safety Board (NTSB) is investigating an incident that occurred at a Dallas, Texas residence on February 23, 2018 that resulted in one fatality and injuries to four other residents. Together with the Railroad Commission of Texas and the Pipeline and Hazardous Materials Safety Administration, Atmos Energy is a party to the investigation and in that capacity is working closely with the NTSB to help determine the cause of this incident.

On March 29, 2018, a civil action was filed in Dallas, Texas against Atmos Energy in response to the February 23rd incident. The plaintiffs seek over $1.0 million in damages for, among with others, wrongful death and personal injury.

We are a party to various other litigation and environmental-related matters or claims that have arisen in the ordinary course of our business. While the results of such litigation and response actions to such environmental-related matters or claims cannot be predicted with certainty, we continue to believe the final outcome of such litigation and matters or claims will not have a material adverse effect on our financial condition, results of operations or cash flows.

Purchase Commitments

Our distribution divisions maintain supply contracts with several vendors that generally cover a period of up to one year. Commitments for estimated base gas volumes are established under these contracts on a monthly basis at contractually negotiated prices. Commitments for incremental daily purchases are made as necessary during the month in accordance with the terms of the individual contract.

Our Mid-Tex Division also maintains a limited number of long-term supply contracts to ensure a reliable source of gas for our customers in its service area, which obligate it to purchase specified volumes at prices indexed to natural gas hubs. At March 31, 2018, we were committed to purchase 55.0 Bcf within one year and 64.7 Bcf within two to three years under indexed contracts.

Regulatory Matters

Various regulatory agencies, including the SEC and the Commodities Futures Trading Commission, continue to adopt regulations implementing many of the provisions of the Dodd-Frank Act of 2010. We continue to enact new procedures and modify existing business practices and contractual arrangements to comply with such regulations.  Additional rulemakings are pending which we believe will result in new reporting and disclosure obligations. The costs associated with hedging certain risks inherent in our business may be further increased when these expected additional regulations are adopted.

As of March 31, 2018, formula rate mechanisms were pending regulatory approval in our Louisiana and Tennessee service areas, infrastructure mechanisms were pending regulatory approval in our Mid-Tex, Mississippi and West Texas service areas as well as the Atmos Pipeline–Texas Division and rate cases were pending regulatory approval in our Colorado and Kentucky service areas. These regulatory proceedings are discussed in further detail below in Management’s Discussion and Analysis — Recent Ratemaking Developments. On April 3, 2018, we filed formula rate mechanisms in our Mid-Tex and West Texas service areas, seeking increases in operating income. Additionally, as discussed in further detail in Note 6, all jurisdictions are addressing impacts of the TCJA.

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Financial Instruments

6 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments

Financial Instruments

We currently use financial instruments to mitigate commodity price risk and interest rate risk. The objectives and strategies for using financial instruments and the related accounting for these financial instruments are fully described in Notes 2 and 13 to the consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. During the six months ended March 31, 2018, there were no material changes in our objectives, strategies and accounting for using financial instruments. Our financial instruments do not contain any credit-risk-related or other contingent features that could cause payments to be accelerated when our financial instruments are in net liability positions. The following summarizes those objectives and strategies.

Commodity Risk Management Activities

Our purchased gas cost adjustment mechanisms essentially insulate our distribution segment from commodity price risk; however, our customers are exposed to the effects of volatile natural gas prices. We manage this exposure through a combination of physical storage, fixed-price forward contracts and financial instruments, primarily over-the-counter swap and option contracts, in an effort to minimize the impact of natural gas price volatility on our customers during the winter heating season.

We typically seek to hedge between 25 and 50 percent of anticipated heating season gas purchases using financial instruments. For the 2017-2018 heating season (generally October through March), in the jurisdictions where we are permitted to utilize financial instruments, we hedged approximately 26 percent, or 15.0 Bcf of the winter flowing gas requirements. We have not designated these financial instruments as hedges for accounting purposes.

Interest Rate Risk Management Activities

We periodically manage interest rate risk by entering into financial instruments to effectively fix the Treasury yield component of the interest cost associated with anticipated financings.

As of March 31, 2018, we had forward starting interest rate swaps to effectively fix the Treasury yield component associated with the anticipated issuance of $450 million unsecured senior notes in fiscal 2019 at 3.78%, which we designated as a cash flow hedge at the time the swaps were executed. As of March 31, 2018, we had $49.1 million of net realized losses in accumulated other comprehensive income (AOCI) associated with the settlement of financial instruments used to fix the Treasury yield component of the interest cost of financing various issuances of long-term debt and senior notes, which will be recognized as a component of interest expense over the life of the associated notes from the date of settlement. The remaining amortization periods for these settled amounts extend through fiscal 2045.

Quantitative Disclosures Related to Financial Instruments

The following tables present detailed information concerning the impact of financial instruments on our condensed consolidated balance sheet and income statements.

As of March 31, 2018, our financial instruments were comprised of both long and short commodity positions. A long position is a contract to purchase the commodity, while a short position is a contract to sell the commodity. As of March 31, 2018, we had 6,251 MMcf of net short commodity contracts outstanding. These contracts have not been designated as hedges.

Financial Instruments on the Balance Sheet

The following tables present the fair value and balance sheet classification of our financial instruments as of March 31, 2018 and September 30, 2017. The gross amounts of recognized assets and liabilities are netted within our unaudited Condensed Consolidated Balance Sheets to the extent that we have netting arrangements with our counterparties.

	Balance Sheet Location	Assets		Liabilities
		(In thousands)
March 31, 2018
Designated As Hedges:
Interest rate contracts	Other current assets / Other current liabilities	$	—	$	(85,948	)
Total		—		(85,948		)
Not Designated As Hedges:
Commodity contracts	Other current assets / Other current liabilities	602		(996		)
Total		602		(996		)
Gross Financial Instruments		602		(86,944		)
Gross Amounts Offset on Consolidated Balance Sheet:
Contract netting		—		—
Net Financial Instruments		602		(86,944		)
Cash collateral		—		—
Net Assets/Liabilities from Risk Management Activities		$	602	$	(86,944	)

	Balance Sheet Location	Assets		Liabilities
		(In thousands)
September 30, 2017
Designated As Hedges:
Interest rate contracts	Deferred charges and other assets / Deferred credits and other liabilities	$	—	$	(112,076	)
Total		—		(112,076		)
Not Designated As Hedges:
Commodity contracts	Other current assets / Other current liabilities	2,436		(322		)
Commodity contracts	Deferred charges and other assets / Deferred credits and other liabilities	803		—
Total		3,239		(322		)
Gross Financial Instruments		3,239		(112,398		)
Gross Amounts Offset on Consolidated Balance Sheet:
Contract netting		—		—
Net Financial Instruments		3,239		(112,398		)
Cash collateral		—		—
Net Assets/Liabilities from Risk Management Activities		$	3,239	$	(112,398	)

Impact of Financial Instruments on the Income Statement

Cash Flow Hedges

As discussed above, our distribution segment has interest rate swap agreements, which we designated as a cash flow hedge at the time the swaps were executed. The net loss on settled interest rate agreements reclassified from AOCI into interest charges on our condensed consolidated statements of income for the three months ended March 31, 2018 and 2017 was $0.6 million and $0.1 million and for the six months ended March 31, 2018 and 2017 was $1.2 million and $0.3 million.

The following table summarizes the gains and losses arising from hedging transactions that were recognized as a component of other comprehensive income (loss), net of taxes, for the three and six months ended March 31, 2018 and 2017. The amounts included in the table below exclude gains and losses arising from ineffectiveness because those amounts are immediately recognized in the income statement as incurred.

	Three Months Ended   March 31				Six Months Ended   March 31
	2018		2017 (1)		2018		2017 (1)
	(In thousands)
Increase in fair value:
Interest rate agreements	$	21,786	$	4,144	$	20,454	$	95,271
Forward commodity contracts(2)	—		—		—		9,847
Recognition of (gains) losses in earnings due to settlements:
Interest rate agreements	458		86		835		173
Forward commodity contracts(2)	—		—		—		(4,865		)
Total other comprehensive income from hedging, net of tax	$	22,244	$	4,230	$	21,289	$	100,426

(1) Utilizing an income tax rate ranging from 37 percent to 39 percent based on the effective rates in each taxing jurisdiction for the three and six-month period ended March 31, 2017.

(2) Due to the sale of AEM, these amounts are included in income from discontinued operations.

Deferred gains (losses) recorded in AOCI associated with our interest rate agreements are recognized in earnings as they are amortized over the terms of the underlying debt instruments. The following amounts, net of deferred taxes, represent the expected recognition in earnings, as of March 31, 2018, of the deferred losses recorded in AOCI associated with our financial instruments, based upon the fair values of these financial instruments at the date of settlement. However, the table below does not include the expected recognition in earnings of our outstanding interest rate agreements as those instruments have not yet settled.

	Interest Rate Agreements
	(In thousands)
Next twelve months	$	(1,833	)
Thereafter	(47,281		)
Total	$	(49,114	)

Financial Instruments Not Designated as Hedges

As discussed above, financial instruments used in our distribution segment are not designated as hedges. However, there is no earnings impact on our distribution segment as a result of the use of these financial instruments because the gains and losses arising from the use of these financial instruments are recognized in the consolidated statement of income as a component of purchased gas cost when the related costs are recovered through our rates and recognized in revenue. Accordingly, the impact of these financial instruments is excluded from this presentation.

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Fair Value Measurements

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

We report certain assets and liabilities at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). We record cash and cash equivalents, accounts receivable and accounts payable at carrying value, which substantially approximates fair value due to the short-term nature of these assets and liabilities. For other financial assets and liabilities, we primarily use quoted market prices and other observable market pricing information to minimize the use of unobservable pricing inputs in our measurements when determining fair value. The methods used to determine fair value for our assets and liabilities are fully described in Note 2 to the financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. During the six months ended March 31, 2018, there were no changes in these methods.

Fair value measurements also apply to the valuation of our pension and postretirement plan assets. Current accounting guidance requires employers to annually disclose information about fair value measurements of the assets of a defined benefit pension or other postretirement plan. The fair value of these assets is presented in Note 7 to the financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017.

Quantitative Disclosures

Financial Instruments

The classification of our fair value measurements requires judgment regarding the degree to which market data is observable or corroborated by observable market data. Authoritative accounting literature establishes a fair value hierarchy that prioritizes the inputs used to measure fair value based on observable and unobservable data. The hierarchy categorizes the inputs into three levels, with the highest priority given to unadjusted quoted prices in active markets for identical assets and liabilities (Level 1), with the lowest priority given to unobservable inputs (Level 3). The following tables summarize, by level within the fair value hierarchy, our assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2018 and September 30, 2017. Assets and liabilities are categorized in their entirety based on the lowest level of input that is significant to the fair value measurement.

	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)(1)		Significant Other Unobservable Inputs (Level 3)		Netting and Cash Collateral		March 31, 2018
	(In thousands)
Assets:
Financial instruments	$	—	$	602	$	—	$	—	$	602
Available-for-sale securities
Registered investment companies	39,783		—		—		—		39,783
Bond mutual funds	16,308		—		—		—		16,308
Bonds	—		31,137		—		—		31,137
Money market funds	—		6,437		—		—		6,437
Total available-for-sale securities	56,091		37,574		—		—		93,665
Total assets	$	56,091	$	38,176	$	—	$	—	$	94,267
Liabilities:
Financial instruments	$	—	$	86,944	$	—	$	—	$	86,944

	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)(1)		Significant Other Unobservable Inputs (Level 3)		Netting and Cash Collateral		September 30, 2017
	(In thousands)
Assets:
Financial instruments	$	—	$	3,239	$	—	$	—	$	3,239
Available-for-sale securities
Registered investment companies	41,097		—		—		—		41,097
Bond mutual funds	16,371		—		—		—		16,371
Bonds	—		29,104		—		—		29,104
Money market funds	—		1,837		—		—		1,837
Total available-for-sale securities	57,468		30,941		—		—		88,409
Total assets	$	57,468	$	34,180	$	—	$	—	$	91,648
Liabilities:
Financial instruments	$	—	$	112,398	$	—	$	—	$	112,398

(1) Our Level 2 measurements consist of over-the-counter options and swaps which are valued using a market-based approach in which observable market prices are adjusted for criteria specific to each instrument, such as the strike price, notional amount or basis differences, municipal and corporate bonds which are valued based on the most recent available quoted market prices and money market funds which are valued at cost.

Available-for-sale securities are comprised of the following:

	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
	(In thousands)
As of March 31, 2018
Domestic equity mutual funds	$	25,515	$	8,194	$	(95	)	$	33,614
Foreign equity mutual funds	4,138		2,031		—			6,169
Bond mutual funds	16,548		—		(240		)	16,308
Bonds	31,295		4		(162		)	31,137
Money market funds	6,437		—		—			6,437
	$	83,933	$	10,229	$	(497	)	$	93,665
As of September 30, 2017
Domestic equity mutual funds	$	25,361	$	8,920	$	—		$	34,281
Foreign equity mutual funds	4,581		2,235		—			6,816
Bond mutual funds	16,391		2		(22		)	16,371
Bonds	29,074		46		(16		)	29,104
Money market funds	1,837		—		—			1,837
	$	77,244	$	11,203	$	(38	)	$	88,409

At March 31, 2018 and September 30, 2017, our available-for-sale securities included $46.2 million and $42.9 million related to assets held in separate rabbi trusts for our supplemental executive benefit plans. At March 31, 2018, we maintained investments in bonds that have contractual maturity dates ranging from April 2018 through January 2021.

These securities are reported at market value with unrealized gains and losses shown as a component of accumulated other comprehensive income (loss). We regularly evaluate the performance of these investments on a fund by fund basis for impairment, taking into consideration the fund’s purpose, volatility and current returns. If a determination is made that a decline in fair value is other than temporary, the related fund is written down to its estimated fair value and the other-than-temporary impairment is recognized in the income statement.

Other Fair Value Measures

Our debt is recorded at carrying value. The fair value of our debt is determined using third party market value quotations, which are considered Level 1 fair value measurements for debt instruments with a recent, observable trade or Level 2 fair value measurements for debt instruments where fair value is determined using the most recent available quoted market price. The following table presents the carrying value and fair value of our debt as of March 31, 2018 and September 30, 2017:

	March 31, 2018		September 30, 2017
	(In thousands)
Carrying Amount	$	3,085,000	$	3,085,000
Fair Value	$	3,291,629	$	3,382,272

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Concentration of Credit Risk

6 Months Ended

Mar. 31, 2018

Risks and Uncertainties [Abstract]

Concentration of Credit Risk

Concentration of Credit Risk

Information regarding our concentration of credit risk is disclosed in Note 16 to the financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. During the six months ended March 31, 2018, there were no material changes in our concentration of credit risk.

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Divestitures and Acquisitions

6 Months Ended

Mar. 31, 2018

Divestitures and Acquisitions [Abstract]

Divestitures and Acquisitions [Text Block]

Discontinued Operations

On October 29, 2016, we entered into a Membership Interest Purchase Agreement (the Agreement) with CenterPoint Energy Services, Inc., a subsidiary of CenterPoint Energy, Inc. (CES) to sell all of the equity interests of Atmos Energy Marketing, LLC (AEM). The transaction closed on January 3, 2017, with an effective date of January 1, 2017. CES paid a cash purchase price of $38.3 million plus working capital of $109.0 million for total cash consideration of $147.3 million. Of this amount, $7.0 million was placed into escrow and was to be paid to the Company within 24 months of the closing date, net of any indemnification claims agreed upon between the two companies. In January 2018, $3.0 million of this escrowed amount was released and received by the Company. We recognized a net gain of $0.03 per diluted share on the sale in the second quarter of fiscal 2017 and completed the working capital true–up during the third quarter of fiscal 2017.

The operating results of our natural gas marketing reportable segment have been reported on the condensed consolidated statement of income as income from discontinued operations, net of income tax, for the six months ended March 31, 2017.  Accordingly, expenses related to allocable general corporate overhead and interest expense are not included in these results. 

The tables below set forth selected financial information related to discontinued operations. Operating expenses include operation and maintenance expense, provision for doubtful accounts, depreciation and amortization expense and taxes, other than income. At March 31, 2018 and September 30, 2017 we did not have any assets or liabilities held for sale. As AEM was sold effective January 1, 2017, no operating results are reported on the condensed consolidated statement of income as discontinued operations for the three months ended March 31, 2017. During the three months ended March 31, 2017, we recorded a gain on sale from discontinued operations for $2.7 million, net of tax of $10.2 million.

The following table presents statement of income data related to discontinued operations:

	Six Months Ended   March 31, 2017
	(In thousands)
Operating revenues	$	303,474
Purchased gas cost	277,554
Operating expenses	7,874
Operating income	18,046
Other nonoperating expense	(211		)
Income from discontinued operations before income taxes	17,835
Income tax expense	6,841
Income from discontinued operations	10,994
Gain on sale from discontinued operations, net of tax ($10,215)	2,716
Net income from discontinued operations	$	13,710

The following table presents statement of cash flow data related to discontinued operations:

	Six Months Ended   March 31, 2017
	(In thousands)
Depreciation and amortization expense	$	185
Capital expenditures	$	—
Non-cash loss in commodity contract cash flow hedges	$	(8,165	)

Natural Gas Marketing Commodity Risk Management Activities

Our discontinued natural gas marketing segment was exposed to risks associated with changes in the market price of natural gas through the purchase, sale and delivery of natural gas to its customers at competitive prices. Through December 31, 2016, we managed our exposure to such risks through a combination of physical storage and financial instruments, including futures, over-the-counter and exchange-traded options and swap contracts with counterparties. Effective January 1, 2017, as a result of the sale of AEM, these activities were discontinued.

Due to the sale of AEM, we determined that the cash flows associated with our natural gas marketing commodity cash flow hedges were no longer probable of occurring; therefore, we discontinued hedge accounting as of December 31, 2016. As a result, we reclassified the gain in accumulated other comprehensive income associated with the commodity contracts into earnings as a reduction of purchased gas cost and recognized a pre-tax gain of $10.6 million, which is included in income from discontinued operations on the condensed consolidated statement of income for the six months ended March 31, 2017.

The Company's other risk management activities are discussed in Note 10.

Impact of Financial Instruments on the Income Statement

Hedge ineffectiveness for our natural gas marketing segment was recorded as a component of purchased gas cost, which is included in discontinued operations on the condensed consolidated statements of income, and primarily results from differences in the location and timing of the derivative instrument and the hedged item. For the six months endedMarch 31, 2017, we recognized a gain arising from fair value and cash flow hedge ineffectiveness of $3.4 million. Additional information regarding ineffectiveness recognized in the income statement is included in the tables below.

Fair Value Hedges

The impact of our natural gas marketing segment commodity contracts designated as fair value hedges and the related hedged item on the results of discontinued operations on our condensed consolidated income statement for the six months endedMarch 31, 2017 is presented below.

	Six Months Ended   March 31, 2017
	(In thousands)
Commodity contracts	$	(9,567	)
Fair value adjustment for natural gas inventory designated as the hedged item	12,858
Total decrease in purchased gas cost reflected in income from discontinued operations	$	3,291
The decrease in purchased gas cost reflected in income from discontinued operations is comprised of the following:
Basis ineffectiveness	$	(597	)
Timing ineffectiveness	3,888
	$	3,291

Basis ineffectiveness arises from natural gas market price differences between the locations of the hedged inventory and the delivery location specified in the hedge instruments. Timing ineffectiveness arises due to changes in the difference between the spot price and the futures price, as well as the difference between the timing of the settlement of the futures and the valuation of the underlying physical commodity.

Cash Flow Hedges

The impact of our natural gas marketing segment cash flow hedges on our condensed consolidated income statements for the six months endedMarch 31, 2017 is presented below:

	Six Months Ended   March 31, 2017
	(In thousands)
Loss reclassified from AOCI for effective portion of natural gas marketing commodity contracts	$	(2,612	)
Gain arising from ineffective portion of natural gas marketing commodity contracts	111
Gain on discontinuance of cash flow hedging of natural gas marketing commodity contracts reclassified from AOCI	10,579
Total impact on purchased gas cost reflected in income from discontinued operations	$	8,078

Financial Instruments Not Designated as Hedges

The impact of the natural gas marketing segment's financial instruments that had not been designated as hedges on our condensed consolidated income statements for the six months endedMarch 31, 2017 was a decrease in purchased gas cost of $6.8 million, which is included in discontinued operations on the condensed consolidated statements of income.

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Accounting Policies (Policy)

6 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Regulatory assets and liabilities

Regulatory assets and liabilities

Accounting principles generally accepted in the United States require cost-based, rate-regulated entities that meet certain criteria to reflect the authorized recovery of costs due to regulatory decisions in their financial statements. As a result, certain costs are permitted to be capitalized rather than expensed because they can be recovered through rates. We record certain costs as regulatory assets when future recovery through customer rates is considered probable. Regulatory liabilities are recorded when it is probable that revenues will be reduced for amounts that will be credited to customers through the ratemaking process. Substantially all of our regulatory assets are recorded as a component of deferred charges and other assets and a portion of our regulatory liabilities are recorded as a component of deferred credits and other liabilities. Deferred gas costs are recorded either in other current assets or liabilities and our regulatory excess deferred taxes and regulatory cost of removal obligation is reported separately.

Segment Reporting

Segment Information

 We manage and review our consolidated operations through the following reportable segments:

• The distribution segment is primarily comprised of our regulated natural gas distribution and related sales operations in eight states.

• The pipeline and storage segment is comprised primarily of the pipeline and storage operations of our Atmos Pipeline-Texas division and our natural gas transmission operations in Louisiana.

• Thenatural gas marketing segment was comprised of our discontinued natural gas marketing business.

Our determination of reportable segments considers the strategic operating units under which we manage sales of various products and services to customers in differing regulatory environments. Although our distribution segment operations are geographically dispersed, they are aggregated and reported as a single segment as each natural gas distribution division has similar economic characteristics. In addition, because the pipeline and storage operations of our Atmos Pipeline-Texas division and our natural gas transmission operations in Louisiana have similar economic characteristics, they have been aggregated and reported as a single segment.

The accounting policies of the segments are the same as those described in the summary of significant accounting policies found in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. We evaluate performance based on net income or loss of the respective operating units. We allocate interest and pension expense to the pipeline and storage segment; however, there is no debt or pension liability recorded on the pipeline and storage segment balance sheet. All material intercompany transactions have been eliminated; however, we have not eliminated intercompany profits when such amounts are probable of recovery under the affiliates’ rate regulation process. Income taxes are allocated to each segment as if each segment’s taxes were calculated on a separate return basis.

Earnings Per Share

Earnings Per Share

We use the two-class method of computing earnings per share because we have participating securities in the form of non-vested restricted stock units with a nonforfeitable right to dividend equivalents, for which vesting is predicated solely on the passage of time. The calculation of earnings per share using the two-class method excludes income attributable to these participating securities from the numerator and excludes the dilutive impact of those shares from the denominator.

Fair Value Measurements

Fair Value Measurements

We report certain assets and liabilities at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). We record cash and cash equivalents, accounts receivable and accounts payable at carrying value, which substantially approximates fair value due to the short-term nature of these assets and liabilities. For other financial assets and liabilities, we primarily use quoted market prices and other observable market pricing information to minimize the use of unobservable pricing inputs in our measurements when determining fair value. The methods used to determine fair value for our assets and liabilities are fully described in Note 2 to the financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. During the six months ended March 31, 2018, there were no changes in these methods.

Income Tax

Under generally accepted accounting principles, we use the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled.

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Unaudited Financial Information (Table)

6 Months Ended

Mar. 31, 2018

Regulatory Assets And Liabilities Table [Abstract]

Schedule Of Regulatory Assets And Liabilities [Table Text Block]

Significant regulatory assets and liabilities as of March 31, 2018 and September 30, 2017 included the following:

	March 31, 2018		September 30, 2017
	(In thousands)
Regulatory assets:
Pension and postretirement benefit costs(1)	$	20,918	$	26,826
Infrastructure mechanisms(2)	65,286		46,437
Deferred gas costs	—		65,714
Recoverable loss on reacquired debt	9,954		11,208
Deferred pipeline record collection costs	14,646		11,692
APT annual adjustment mechanism	—		2,160
Rate case costs	3,016		2,629
Other	8,064		10,132
	$	121,884	$	176,798
Regulatory liabilities:
Regulatory excess deferred taxes(3)	$	737,798	$	—
Regulatory cost of service reserve(4)	29,042		—
Regulatory cost of removal obligation	526,483		521,330
Deferred gas costs	167,036		15,559
Asset retirement obligation	12,827		12,827
APT annual adjustment mechanism	5,081		—
Other	14,740		5,941
	$	1,493,007	$	555,657

(1) Includes $7.8 million and $9.4 million of pension and postretirement expense deferred pursuant to regulatory authorization.

(2) Infrastructure mechanisms in Texas and Louisiana allow for the deferral of all eligible expenses associated with capital expenditures incurred pursuant to these rules, including the recording of interest on deferred expenses until the next rate proceeding (rate case or annual rate filing), at which time investment and costs would be recoverable through base rates.

(3) The TCJA resulted in the remeasurement of the net deferred tax liability included in our rate base. The excess deferred taxes will be returned to utility customers in accordance with regulatory requirements. See Note 6 for further information.

(4) Effective January 1, 2018, regulators in each of our service areas required us to establish a regulatory liability for the difference in recoverable federal taxes included in revenues based on the former 35% federal statutory rate and the new 21% federal statutory rate for service provided on or after January 1, 2018. This liability will be returned to utility customers in accordance with regulatory requirements. See Note 6 for further information.

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Segment Information (Table)

6 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Income statements and capital expenditures for the three and six months endedMarch 31, 2018 and 2017 by segment are presented in the following tables:

	Three Months Ended March 31, 2018
	Distribution		Pipeline and Storage			Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	1,198,309	$	21,100		$	—		$	1,219,409
Intersegment revenues	982		99,855			(100,837		)	—
Total operating revenues	1,199,291		120,955			(100,837		)	1,219,409
Purchased gas cost	727,053		433			(100,526		)	626,960
Operation and maintenance expense	131,991		29,393			(311		)	161,073
Depreciation and amortization expense	65,649		23,732			—			89,381
Taxes, other than income	64,692		8,315			—			73,007
Operating income	209,906		59,082			—			268,988
Miscellaneous income (expense)	393		(646		)	—			(253		)
Interest charges	16,898		10,406			—			27,304
Income before income taxes	193,401		48,030			—			241,431
Income tax expense	48,158		14,281			—			62,439
Net income	$	145,243	$	33,749		$	—		$	178,992
Capital expenditures	$	224,235	$	86,505		$	—		$	310,740

	Three Months Ended March 31, 2017
	Distribution		Pipeline and Storage			Natural Gas Marketing		Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	962,217	$	25,969		$	—	$	—		$	988,186
Intersegment revenues	324		86,003			—		(86,327		)	—
Total operating revenues	962,541		111,972			—		(86,327		)	988,186
Purchased gas cost	513,096		725			—		(86,327		)	427,494
Operation and maintenance expense	103,703		28,536			—		—			132,239
Depreciation and amortization expense	61,302		16,365			—		—			77,667
Taxes, other than income	57,636		7,978			—		—			65,614
Operating income	226,804		58,368			—		—			285,172
Miscellaneous income (expense)	1,029		(196		)	—		—			833
Interest charges	16,925		10,019			—		—			26,944
Income from continuing operations before income taxes	210,908		48,153			—		—			259,061
Income tax expense	79,763		17,286			—		—			97,049
Income from continuing operations	131,145		30,867			—		—			162,012
Gain on sale of discontinued operations, net of tax	—		—			2,716		—			2,716
Net income	$	131,145	$	30,867		$	2,716	$	—		$	164,728
Capital expenditures	$	208,185	$	53,238		$	—	$	—		$	261,423

	Six Months Ended March 31, 2018
	Distribution			Pipeline and Storage			Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	2,058,762		$	49,839		$	—		$	2,108,601
Intersegment revenues	1,321			197,579			(198,900		)	—
Total operating revenues	2,060,083			247,418			(198,900		)	2,108,601
Purchased gas cost	1,190,811			1,345			(198,279		)	993,877
Operation and maintenance expense	235,728			55,533			(621		)	290,640
Depreciation and amortization expense	131,083			46,672			—			177,755
Taxes, other than income	119,799			15,981			—			135,780
Operating income	382,662			127,887			—			510,549
Miscellaneous expense	(1,007		)	(1,281		)	—			(2,288		)
Interest charges	38,266			20,547			—			58,813
Income before income taxes	343,389			106,059			—			449,448
Income tax (benefit) expense	(50,953		)	7,277			—			(43,676		)
Net income	$	394,342		$	98,782		$	—		$	493,124
Capital expenditures	$	465,484		$	228,494		$	—		$	693,978

	Six Months Ended March 31, 2017
	Distribution		Pipeline and Storage			Natural Gas Marketing		Eliminations			Consolidated
	(In thousands)
Operating revenues from external parties	$	1,716,483	$	51,871		$	—	$	—		$	1,768,354
Intersegment revenues	714		170,053			—		(170,767		)	—
Total operating revenues	1,717,197		221,924			—		(170,767		)	1,768,354
Purchased gas cost	908,442		1,080			—		(170,723		)	738,799
Operation and maintenance expense	196,417		60,804			—		(44		)	257,177
Depreciation and amortization expense	122,459		32,166			—		—			154,625
Taxes, other than income	108,182		14,481			—		—			122,663
Operating income	381,697		113,393			—		—			495,090
Miscellaneous income (expense)	396		(557		)	—		—			(161		)
Interest charges	38,043		19,931			—		—			57,974
Income from continuing operations before income taxes	344,050		92,905			—		—			436,955
Income tax expense	127,541		33,364			—		—			160,905
Income from continuing operations	216,509		59,541			—		—			276,050
Income from discontinued operations, net of tax	—		—			10,994		—			10,994
Gain on sale of discontinued operations, net of tax	—		—			2,716		—			2,716
Net income	$	216,509	$	59,541		$	13,710	$	—		$	289,760
Capital expenditures	$	430,669	$	128,716		$	—	$	—		$	559,385

Balance sheet information at March 31, 2018 and September 30, 2017 by segment is presented in the following tables:

	March 31, 2018
	Distribution		Pipeline and Storage		Eliminations			Consolidated
	(In thousands)
Property, plant and equipment, net	$	7,202,673	$	2,558,656	$	—		$	9,761,329
Total assets	$	10,723,398	$	2,779,330	$	(2,146,406	)	$	11,356,322

	September 30, 2017
	Distribution		Pipeline and Storage		Eliminations			Consolidated
	(In thousands)
Property, plant and equipment, net	$	6,849,517	$	2,409,665	$	—		$	9,259,182
Total assets	$	10,050,164	$	2,621,601	$	(1,922,169	)	$	10,749,596

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Earnings Per Share (Table)

6 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings per share table

Basic and diluted earnings per share for the three and six months ended March 31, 2018 and 2017 are calculated as follows:

	Three Months Ended   March 31				Six Months Ended   March 31
	2018		2017		2018		2017
	(In thousands, except per share amounts)
Basic and Diluted Earnings Per Share from continuing operations
Income from continuing operations	$	178,992	$	162,012	$	493,124	$	276,050
Less: Income from continuing operations allocated to participating securities	161		193		459		348
Income from continuing operations available to common shareholders	$	178,831	$	161,819	$	492,665	$	275,702
Basic and diluted weighted average shares outstanding	111,706		105,935		110,135		105,610
Income from continuing operations per share — Basic and Diluted	$	1.60	$	1.52	$	4.47	$	2.61
Basic and Diluted Earnings Per Share from discontinued operations
Income from discontinued operations	$	—	$	2,716	$	—	$	13,710
Less: Income from discontinued operations allocated to participating securities	—		2		—		15
Income from discontinued operations available to common shareholders	$	—	$	2,714	$	—	$	13,695
Basic and diluted weighted average shares outstanding	111,706		105,935		110,135		105,610
Income from discontinued operations per share — Basic and Diluted	$	—	$	0.03	$	—	$	0.13
Net income per share — Basic and Diluted	$	1.60	$	1.55	$	4.47	$	2.74

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Debt (Table)

6 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Components of Debt

Long-term debt at March 31, 2018 and September 30, 2017 consisted of the following:

	March 31, 2018			September 30, 2017
	(In thousands)
Unsecured 8.50% Senior Notes, due March 2019	$	450,000		$	450,000
Unsecured 3.00% Senior Notes, due 2027	500,000			500,000
Unsecured 5.95% Senior Notes, due 2034	200,000			200,000
Unsecured 5.50% Senior Notes, due 2041	400,000			400,000
Unsecured 4.15% Senior Notes, due 2043	500,000			500,000
Unsecured 4.125% Senior Notes, due 2044	750,000			750,000
Medium-term note Series A, 1995-1, 6.67%, due 2025	10,000			10,000
Unsecured 6.75% Debentures, due 2028	150,000			150,000
Floating-rate term loan, due September 2019(1)	125,000			125,000
Total long-term debt	3,085,000			3,085,000
Less:
Original issue premium / discount on unsecured senior notes and debentures	(4,412		)	(4,384		)
Debt issuance cost	21,520			22,339
Current maturities	450,000			—
	$	2,617,892		$	3,067,045

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Shareholders' Equity (Table)

6 Months Ended

Mar. 31, 2018

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following tables provide the components of our accumulated other comprehensive income (loss) balances, net of the related tax effects allocated to each component of other comprehensive income (loss):

	Available- for-Sale Securities			Interest Rate Agreement Cash Flow Hedges			Total
	(In thousands)
September 30, 2017	$	7,048		$	(112,302	)	$	(105,254	)
Other comprehensive income (loss) before reclassifications	(167		)	20,454			20,287
Amounts reclassified from accumulated other comprehensive income	(879		)	835			(44		)
Net current-period other comprehensive income (loss)	(1,046		)	21,289			20,243
March 31, 2018	$	6,002		$	(91,013	)	$	(85,011	)

	Available- for-Sale Securities		Interest Rate Agreement Cash Flow Hedges			Commodity Contracts Cash Flow Hedges			Total
	(In thousands)
September 30, 2016	$	4,484	$	(187,524	)	$	(4,982	)	$	(188,022	)
Other comprehensive income before reclassifications	634		95,271			9,847			105,752
Amounts reclassified from accumulated other comprehensive income	68		173			(4,865		)	(4,624		)
Net current-period other comprehensive income	702		95,444			4,982			101,128
March 31, 2017	$	5,186	$	(92,080	)	$	—		$	(86,894	)

Reclassification out of Accumulated Other Comprehensive Income

The following tables detail reclassifications out of AOCI for the three and six months ended March 31, 2018 and 2017. Amounts in parentheses below indicate decreases to net income in the statement of income:

	Three Months Ended March 31, 2018
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement of Income
	(In thousands)
Available-for-sale securities	$	1,139		Operation and maintenance expense
	1,139			Total before tax
	(260		)	Tax expense
	$	879		Net of tax
Cash flow hedges
Interest rate agreements	$	(593	)	Interest charges
	(593		)	Total before tax
	135			Tax benefit
	$	(458	)	Net of tax
Total reclassifications	$	421		Net of tax

	Three Months Ended March 31, 2017
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in the Statement of Income
	(In thousands)
Available-for-sale securities	$	(107	)	Operation and maintenance expense
	(107		)	Total before tax
	39			Tax benefit
	$	(68	)	Net of tax
Cash flow hedges
Interest rate agreements	$	(136	)	Interest charges
	(136		)	Total before tax
	50			Tax benefit
	$	(86	)	Net of tax
Total reclassifications	$	(154	)	Net of tax

	Six Months Ended March 31, 2018
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in  the Statement of Income
	(In thousands)
Available-for-sale securities	$	1,139		Operation and maintenance expense
	1,139			Total before tax
	(260		)	Tax expense
	$	879		Net of tax
Cash flow hedges
Interest rate agreements	$	(1,187	)	Interest charges
	(1,187		)	Total before tax
	352			Tax benefit
	$	(835	)	Net of tax
Total reclassifications	$	44		Net of tax

	Six Months Ended March 31, 2017
Accumulated Other Comprehensive Income Components	Amount Reclassified from Accumulated Other Comprehensive Income			Affected Line Item in  the Statement of Income
	(In thousands)
Available-for-sale securities	$	(107	)	Operation and maintenance expense
	(107		)	Total before tax
	39			Tax benefit
	$	(68	)	Net of tax
Cash flow hedges
Interest rate agreements	$	(273	)	Interest charges
Commodity contracts	7,967			Purchased gas cost(1)
	7,694			Total before tax
	(3,002		)	Tax expense
	$	4,692		Net of tax
Total reclassifications	$	4,624		Net of tax

(1) Amount is presented as part of income from discontinued operations in the condensed consolidated statement of income.

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Interim Pension and Other Postretirement Benefits (Table)

6 Months Ended

Mar. 31, 2018

Retirement Benefits, Description [Abstract]

Components of net periodic pension cost table

The components of our net periodic pension cost for our pension and other postretirement benefit plans for the three and six months endedMarch 31, 2018 and 2017 are presented in the following tables. Most of these costs are recoverable through our tariff rates; however, a portion of these costs is capitalized into our rate base. The remaining costs are recorded as a component of operation and maintenance expense. In the second quarter of fiscal 2018, due to the retirement of certain executives, we recognized a settlement loss of $2.4 million associated with our Supplemental Executive Retirement Plan and revalued the net periodic pension cost for the remainder of fiscal 2018. The revaluation of the net periodic pension cost for our Supplemental Executive Retirement Plan resulted in an increase in the discount rate, effective March 1, 2018, to 4.12%, which will increase our net periodic pension cost by approximately $0.1 million for the remainder of the fiscal year.

	Three Months Ended March 31
	Pension Benefits						Other Benefits
	2018			2017			2018			2017
	(In thousands)
Components of net periodic pension cost:
Service cost	$	4,575		$	5,217		$	3,019		$	3,109
Interest cost	6,433			6,297			2,727			2,670
Expected return on assets	(6,916		)	(6,994		)	(2,001		)	(1,797		)
Amortization of prior service cost (credit)	(58		)	(58		)	3			(411		)
Amortization of actuarial (gain) loss	3,085			4,249			(1,619		)	(707		)
Settlements	2,415			—			—			—
Net periodic pension cost	$	9,534		$	8,711		$	2,129		$	2,864

	Six Months Ended March 31
	Pension Benefits						Other Benefits
	2018			2017			2018			2017
	(In thousands)
Components of net periodic pension cost:
Service cost	$	9,135		$	10,433		$	6,039		$	6,218
Interest cost	12,863			12,594			5,454			5,340
Expected return on assets	(13,833		)	(13,988		)	(4,003		)	(3,593		)
Amortization of prior service cost (credit)	(116		)	(116		)	6			(822		)
Amortization of actuarial (gain) loss	6,174			8,498			(3,237		)	(1,414		)
Settlements	2,415			—			—			—
Net periodic pension cost	$	16,638		$	17,421		$	4,259		$	5,729

Schedule of assumptions used table text block

The assumptions used to develop our net periodic pension cost for the three and six months endedMarch 31, 2018 and 2017 are as follows:

	Supplemental Executive Retirement Plan		Pension Benefits		Other Benefits
	2018	2017	2018	2017	2018	2017
Discount rate	4.12%	3.73%	3.89%	3.73%	3.89%	3.73%
Rate of compensation increase	3.50%	3.50%	3.50%	3.50%	N/A	N/A
Expected return on plan assets	N/A	N/A	6.75%	7.00%	4.29%	4.45%

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Financial Instruments (Table)

6 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial instruments on the balance sheet

The following tables present the fair value and balance sheet classification of our financial instruments as of March 31, 2018 and September 30, 2017. The gross amounts of recognized assets and liabilities are netted within our unaudited Condensed Consolidated Balance Sheets to the extent that we have netting arrangements with our counterparties.

	Balance Sheet Location	Assets		Liabilities
		(In thousands)
March 31, 2018
Designated As Hedges:
Interest rate contracts	Other current assets / Other current liabilities	$	—	$	(85,948	)
Total		—		(85,948		)
Not Designated As Hedges:
Commodity contracts	Other current assets / Other current liabilities	602		(996		)
Total		602		(996		)
Gross Financial Instruments		602		(86,944		)
Gross Amounts Offset on Consolidated Balance Sheet:
Contract netting		—		—
Net Financial Instruments		602		(86,944		)
Cash collateral		—		—
Net Assets/Liabilities from Risk Management Activities		$	602	$	(86,944	)

	Balance Sheet Location	Assets		Liabilities
		(In thousands)
September 30, 2017
Designated As Hedges:
Interest rate contracts	Deferred charges and other assets / Deferred credits and other liabilities	$	—	$	(112,076	)
Total		—		(112,076		)
Not Designated As Hedges:
Commodity contracts	Other current assets / Other current liabilities	2,436		(322		)
Commodity contracts	Deferred charges and other assets / Deferred credits and other liabilities	803		—
Total		3,239		(322		)
Gross Financial Instruments		3,239		(112,398		)
Gross Amounts Offset on Consolidated Balance Sheet:
Contract netting		—		—
Net Financial Instruments		3,239		(112,398		)
Cash collateral		—		—
Net Assets/Liabilities from Risk Management Activities		$	3,239	$	(112,398	)

Other comprehensive income from hedging table

The following table summarizes the gains and losses arising from hedging transactions that were recognized as a component of other comprehensive income (loss), net of taxes, for the three and six months ended March 31, 2018 and 2017. The amounts included in the table below exclude gains and losses arising from ineffectiveness because those amounts are immediately recognized in the income statement as incurred.

	Three Months Ended   March 31				Six Months Ended   March 31
	2018		2017 (1)		2018		2017 (1)
	(In thousands)
Increase in fair value:
Interest rate agreements	$	21,786	$	4,144	$	20,454	$	95,271
Forward commodity contracts(2)	—		—		—		9,847
Recognition of (gains) losses in earnings due to settlements:
Interest rate agreements	458		86		835		173
Forward commodity contracts(2)	—		—		—		(4,865		)
Total other comprehensive income from hedging, net of tax	$	22,244	$	4,230	$	21,289	$	100,426

(1) Utilizing an income tax rate ranging from 37 percent to 39 percent based on the effective rates in each taxing jurisdiction for the three and six-month period ended March 31, 2017.

(2) Due to the sale of AEM, these amounts are included in income from discontinued operations.

Expected recognition in earnings of deferred gains/(losses) in AOCI table

The following amounts, net of deferred taxes, represent the expected recognition in earnings, as of March 31, 2018, of the deferred losses recorded in AOCI associated with our financial instruments, based upon the fair values of these financial instruments at the date of settlement. However, the table below does not include the expected recognition in earnings of our outstanding interest rate agreements as those instruments have not yet settled.

	Interest Rate Agreements
	(In thousands)
Next twelve months	$	(1,833	)
Thereafter	(47,281		)
Total	$	(49,114	)

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Fair Value Measurements (Table)

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair value measurements table

The following tables summarize, by level within the fair value hierarchy, our assets and liabilities that were accounted for at fair value on a recurring basis as of March 31, 2018 and September 30, 2017. Assets and liabilities are categorized in their entirety based on the lowest level of input that is significant to the fair value measurement.

	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)(1)		Significant Other Unobservable Inputs (Level 3)		Netting and Cash Collateral		March 31, 2018
	(In thousands)
Assets:
Financial instruments	$	—	$	602	$	—	$	—	$	602
Available-for-sale securities
Registered investment companies	39,783		—		—		—		39,783
Bond mutual funds	16,308		—		—		—		16,308
Bonds	—		31,137		—		—		31,137
Money market funds	—		6,437		—		—		6,437
Total available-for-sale securities	56,091		37,574		—		—		93,665
Total assets	$	56,091	$	38,176	$	—	$	—	$	94,267
Liabilities:
Financial instruments	$	—	$	86,944	$	—	$	—	$	86,944

	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)(1)		Significant Other Unobservable Inputs (Level 3)		Netting and Cash Collateral		September 30, 2017
	(In thousands)
Assets:
Financial instruments	$	—	$	3,239	$	—	$	—	$	3,239
Available-for-sale securities
Registered investment companies	41,097		—		—		—		41,097
Bond mutual funds	16,371		—		—		—		16,371
Bonds	—		29,104		—		—		29,104
Money market funds	—		1,837		—		—		1,837
Total available-for-sale securities	57,468		30,941		—		—		88,409
Total assets	$	57,468	$	34,180	$	—	$	—	$	91,648
Liabilities:
Financial instruments	$	—	$	112,398	$	—	$	—	$	112,398

(1) Our Level 2 measurements consist of over-the-counter options and swaps which are valued using a market-based approach in which observable market prices are adjusted for criteria specific to each instrument, such as the strike price, notional amount or basis differences, municipal and corporate bonds which are valued based on the most recent available quoted market prices and money market funds which are valued at cost.

Schedule of Available-for-sale Securities Reconciliation Table

Available-for-sale securities are comprised of the following:

	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
	(In thousands)
As of March 31, 2018
Domestic equity mutual funds	$	25,515	$	8,194	$	(95	)	$	33,614
Foreign equity mutual funds	4,138		2,031		—			6,169
Bond mutual funds	16,548		—		(240		)	16,308
Bonds	31,295		4		(162		)	31,137
Money market funds	6,437		—		—			6,437
	$	83,933	$	10,229	$	(497	)	$	93,665
As of September 30, 2017
Domestic equity mutual funds	$	25,361	$	8,920	$	—		$	34,281
Foreign equity mutual funds	4,581		2,235		—			6,816
Bond mutual funds	16,391		2		(22		)	16,371
Bonds	29,074		46		(16		)	29,104
Money market funds	1,837		—		—			1,837
	$	77,244	$	11,203	$	(38	)	$	88,409

Other fair value measurements table

The following table presents the carrying value and fair value of our debt as of March 31, 2018 and September 30, 2017:

	March 31, 2018		September 30, 2017
	(In thousands)
Carrying Amount	$	3,085,000	$	3,085,000
Fair Value	$	3,291,629	$	3,382,272

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Divestitures and Acquisitions (Tables)

6 Months Ended

Mar. 31, 2018

Divestitures and Acquisitions [Abstract]

Disposal Groups, Including Discontinued Operations [Table Text Block]

The following table presents statement of income data related to discontinued operations:

	Six Months Ended   March 31, 2017
	(In thousands)
Operating revenues	$	303,474
Purchased gas cost	277,554
Operating expenses	7,874
Operating income	18,046
Other nonoperating expense	(211		)
Income from discontinued operations before income taxes	17,835
Income tax expense	6,841
Income from discontinued operations	10,994
Gain on sale from discontinued operations, net of tax ($10,215)	2,716
Net income from discontinued operations	$	13,710

The following table presents statement of cash flow data related to discontinued operations:

	Six Months Ended   March 31, 2017
	(In thousands)
Depreciation and amortization expense	$	185
Capital expenditures	$	—
Non-cash loss in commodity contract cash flow hedges	$	(8,165	)

Fair value hedges table

The impact of our natural gas marketing segment commodity contracts designated as fair value hedges and the related hedged item on the results of discontinued operations on our condensed consolidated income statement for the six months endedMarch 31, 2017 is presented below.

	Six Months Ended   March 31, 2017
	(In thousands)
Commodity contracts	$	(9,567	)
Fair value adjustment for natural gas inventory designated as the hedged item	12,858
Total decrease in purchased gas cost reflected in income from discontinued operations	$	3,291
The decrease in purchased gas cost reflected in income from discontinued operations is comprised of the following:
Basis ineffectiveness	$	(597	)
Timing ineffectiveness	3,888
	$	3,291

Cash flow hedges

The impact of our natural gas marketing segment cash flow hedges on our condensed consolidated income statements for the six months endedMarch 31, 2017 is presented below:

	Six Months Ended   March 31, 2017
	(In thousands)
Loss reclassified from AOCI for effective portion of natural gas marketing commodity contracts	$	(2,612	)
Gain arising from ineffective portion of natural gas marketing commodity contracts	111
Gain on discontinuance of cash flow hedging of natural gas marketing commodity contracts reclassified from AOCI	10,579
Total impact on purchased gas cost reflected in income from discontinued operations	$	8,078

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Nature of Business (Details) customers in Millions	Mar. 31, 2018 state customers regulated_gas_distributions_divisions
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Customers, Regulated Distribution | customers	3
Number of Divisions, Regulated Distribution | regulated_gas_distributions_divisions	6
Number of States in which Entity Operates | state	8

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Unaudited Interim Financial Information (Details) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
		Mar. 31, 2018		Sep. 30, 2017
Regulatory Asset [Line Items]
Regulatory assets		$ 121,884		$ 176,798
Regulatory asset - future recoverable pension costs		7,800		9,400
Regulatory Liabilities [Line Items]
Regulatory liabilities		$ 1,493,007		$ 555,657
Federal Statutory Income Tax Rate, Pre TCJA, Percent		35.00%		35.00%
Federal Statutory Income Tax Rate, Post TCJA, Percent		21.00%
Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities		$ 737,798	[1]	$ 0
Regulatory Cost of Removal [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities		526,483		521,330
Deferred Gas Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities		167,036		15,559
Asset Retirement Obligation Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities		12,827		12,827
Revenue Subject to Refund [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities		5,081		0
Other [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities		14,740		5,941
Regulatory Cost of Service Reserve [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities		29,042	[2]	0
Pension And Postretirement Benefit Costs [Member]
Regulatory Asset [Line Items]
Regulatory assets	[3]	20,918		26,826
Infrastructure Mechanisms [Member]
Regulatory Asset [Line Items]
Regulatory assets	[4]	65,286		46,437
Deferred Gas Costs [Member]
Regulatory Asset [Line Items]
Regulatory assets		0		65,714
Recoverable Loss On Reacquired Debt [Member]
Regulatory Asset [Line Items]
Regulatory assets		9,954		11,208
Deferred Project Costs [Member]
Regulatory Asset [Line Items]
Regulatory assets		14,646		11,692
APT Annual Adjustment Mechanism [Member]
Regulatory Asset [Line Items]
Regulatory assets		0		2,160
Rate Case Costs [Member]
Regulatory Asset [Line Items]
Regulatory assets		3,016		2,629
Other [Member]
Regulatory Asset [Line Items]
Regulatory assets		$ 8,064		$ 10,132

[1] The TCJA resulted in the remeasurement of the net deferred tax liability included in our rate base. The excess deferred taxes will be returned to utility customers in accordance with regulatory requirements. See Note 6 for further information.

[2] Effective January 1, 2018, regulators in each of our service areas required us to establish a regulatory liability for the difference in recoverable federal taxes included in revenues based on the former 35% federal statutory rate and the new 21% federal statutory rate for service provided on or after January 1, 2018. This liability will be returned to utility customers in accordance with regulatory requirements. See Note 6 for further information.

[3] Includes $7.8 million and $9.4 million of pension and postretirement expense deferred pursuant to regulatory authorization.

[4] Infrastructure mechanisms in Texas and Louisiana allow for the deferral of all eligible expenses associated with capital expenditures incurred pursuant to these rules, including the recording of interest on deferred expenses until the next rate proceeding (rate case or annual rate filing), at which time investment and costs would be recoverable through base rates

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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Segment Reporting Information Profit Loss [Abstract]
Total operating revenues	$ 1,219,409	$ 988,186	$ 2,108,601	$ 1,768,354
Purchased gas cost	626,960	427,494	993,877	738,799
Operation and maintenance expense	161,073	132,239	290,640	257,177
Depreciation and amortization expense	89,381	77,667	177,755	154,625
Taxes, other than income, expense	73,007	65,614	135,780	122,663
Operating income	268,988	285,172	510,549	495,090
Miscellaneous income (expense)	(253)	833	(2,288)	(161)
Interest charges	27,304	26,944	58,813	57,974
Income (loss) from continuing operations before income taxes	241,431	259,061	449,448	436,955
Income tax expense (benefit)	62,439	97,049	(43,676)	160,905
Income from continuing operations	178,992	162,012	493,124	276,050
Income from discontinued operations, net of tax			0	10,994
Gain on sale of discontinued operations, net of tax	0	2,716	0	2,716
Net income (loss)	178,992	164,728	493,124	289,760
Capital expenditures	310,740	261,423	693,978	559,385
Segment Reporting Information, Balance Sheet [Abstract]
Net property, plant and equipment	9,761,329		9,761,329		$ 9,259,182
Total assets	11,356,322		11,356,322		10,749,596
Reportable Subsegments [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	1,219,409	988,186	2,108,601	1,768,354
Intersubsegment Eliminations [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	0	0	0	0
Distribution Segment [Member]
Segment Reporting Information Profit Loss [Abstract]
Total operating revenues	1,199,291	962,541	2,060,083	1,717,197
Purchased gas cost	727,053	513,096	1,190,811	908,442
Operation and maintenance expense	131,991	103,703	235,728	196,417
Depreciation and amortization expense	65,649	61,302	131,083	122,459
Taxes, other than income, expense	64,692	57,636	119,799	108,182
Operating income	209,906	226,804	382,662	381,697
Miscellaneous income (expense)	393	1,029	(1,007)	396
Interest charges	16,898	16,925	38,266	38,043
Income (loss) from continuing operations before income taxes	193,401	210,908	343,389	344,050
Income tax expense (benefit)	48,158	79,763	(50,953)	127,541
Income from continuing operations		131,145		216,509
Income from discontinued operations, net of tax				0
Gain on sale of discontinued operations, net of tax		0		0
Net income (loss)	145,243	131,145	394,342	216,509
Capital expenditures	224,235	208,185	465,484	430,669
Segment Reporting Information, Balance Sheet [Abstract]
Net property, plant and equipment	7,202,673		7,202,673		6,849,517
Total assets	10,723,398		10,723,398		10,050,164
Distribution Segment [Member] | Reportable Subsegments [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	1,198,309	962,217	2,058,762	1,716,483
Distribution Segment [Member] | Intersubsegment Eliminations [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	982	324	1,321	714
Pipeline and Storage Segment [Member]
Segment Reporting Information Profit Loss [Abstract]
Total operating revenues	120,955	111,972	247,418	221,924
Purchased gas cost	433	725	1,345	1,080
Operation and maintenance expense	29,393	28,536	55,533	60,804
Depreciation and amortization expense	23,732	16,365	46,672	32,166
Taxes, other than income, expense	8,315	7,978	15,981	14,481
Operating income	59,082	58,368	127,887	113,393
Miscellaneous income (expense)	(646)	(196)	(1,281)	(557)
Interest charges	10,406	10,019	20,547	19,931
Income (loss) from continuing operations before income taxes	48,030	48,153	106,059	92,905
Income tax expense (benefit)	14,281	17,286	7,277	33,364
Income from continuing operations		30,867		59,541
Income from discontinued operations, net of tax				0
Gain on sale of discontinued operations, net of tax		0		0
Net income (loss)	33,749	30,867	98,782	59,541
Capital expenditures	86,505	53,238	228,494	128,716
Segment Reporting Information, Balance Sheet [Abstract]
Net property, plant and equipment	2,558,656		2,558,656		2,409,665
Total assets	2,779,330		2,779,330		2,621,601
Pipeline and Storage Segment [Member] | Reportable Subsegments [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	21,100	25,969	49,839	51,871
Pipeline and Storage Segment [Member] | Intersubsegment Eliminations [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	99,855	86,003	197,579	170,053
Natural Gas Marketing Segment [Member]
Segment Reporting Information Profit Loss [Abstract]
Total operating revenues		0		0
Purchased gas cost		0		0
Operation and maintenance expense		0		0
Depreciation and amortization expense		0		0
Taxes, other than income, expense		0		0
Operating income		0		0
Miscellaneous income (expense)		0		0
Interest charges		0		0
Income (loss) from continuing operations before income taxes		0		0
Income tax expense (benefit)		0		0
Income from continuing operations		0		0
Income from discontinued operations, net of tax				10,994
Gain on sale of discontinued operations, net of tax		2,716		2,716
Net income (loss)		2,716		13,710
Capital expenditures		0		0
Natural Gas Marketing Segment [Member] | Reportable Subsegments [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues		0		0
Natural Gas Marketing Segment [Member] | Intersubsegment Eliminations [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues		0		0
Intersegment Elimination [Member]
Segment Reporting Information Profit Loss [Abstract]
Total operating revenues	(100,837)	(86,327)	(198,900)	(170,767)
Purchased gas cost	(100,526)	(86,327)	(198,279)	(170,723)
Operation and maintenance expense	(311)	0	(621)	(44)
Depreciation and amortization expense	0	0	0	0
Taxes, other than income, expense	0	0	0	0
Operating income	0	0	0	0
Miscellaneous income (expense)	0	0	0	0
Interest charges	0	0	0	0
Income (loss) from continuing operations before income taxes	0	0	0	0
Income tax expense (benefit)	0	0	0	0
Income from continuing operations		0		0
Income from discontinued operations, net of tax				0
Gain on sale of discontinued operations, net of tax		0		0
Net income (loss)	0	0	0	0
Capital expenditures	0	0	0	0
Segment Reporting Information, Balance Sheet [Abstract]
Net property, plant and equipment	0		0		0
Total assets	(2,146,406)		(2,146,406)		$ (1,922,169)
Intersegment Elimination [Member] | Reportable Subsegments [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	0	0	0	0
Intersegment Elimination [Member] | Intersubsegment Eliminations [Member]
Segment Reporting Information Profit Loss [Abstract]
Revenues	$ (100,837)	$ (86,327)	$ (198,900)	$ (170,767)

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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Income from continuing operations	$ 178,992	$ 162,012	$ 493,124	$ 276,050
Income allocated to participating securities	161	193	459	348
Income from continuing operations available to common shareholders	$ 178,831	$ 161,819	$ 492,665	$ 275,702
Income (Loss) from Continuing Operations, Per Basic and Diluted Share	$ 1.60	$ 1.52	$ 4.47	$ 2.61
Income from discontinued operations, net of tax	$ 0	$ 2,716	$ 0	$ 13,710
Undistributed Earnings From Discontinued Operations Allocated To Participating Securities	0	2	0	15
Income from discontinued operations available to common shareholders	$ 0	$ 2,714	$ 0	$ 13,695
Income (Loss) from Discontinued Operation, Net of Tax, Per Basic and Diluted Share	$ 0.00	$ 0.03	$ 0.00	$ 0.13
Basic and diluted net income per share	$ 1.60	$ 1.55	$ 4.47	$ 2.74
Weighted Average Number of Shares Outstanding, Basic and Diluted	111,706	105,935	110,135	105,610

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Debt (Details) - USD ($)		3 Months Ended
		Mar. 31, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Debt Instrument Carrying Amount		$ 3,085,000,000	$ 3,085,000,000
Debt Instrument, Unamortized Discount (Premium), Net		(4,412,000)	(4,384,000)
Debt Issuance Costs, Net		21,520,000	22,339,000
Current maturities of long-term debt		450,000,000	0
Long-term debt		2,617,892,000	3,067,045,000
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,500,000,000
Long Term Debt Other Disclosures [Abstract]
Term Loan Agreement, Maximum Borrowing Capacity		200,000,000	200,000,000
Commercial Paper		$ 129,600,000	447,700,000
Required by Covenant [Member]
Line Of Credit Facility [Line Items]
Ratio of Total Debt to Total Capital		70.00%
Actual [Member]
Line Of Credit Facility [Line Items]
Ratio of Total Debt to Total Capital		41.00%
Minimum [Member]
Line Of Credit Facility [Line Items]
Equity to Capitalization Ratio		50.00%
Minimum [Member] | Required by Covenant [Member]
Line Of Credit Facility [Line Items]
Excess of Debt		$ 15,000,000
Maximum [Member]
Line Of Credit Facility [Line Items]
Equity to Capitalization Ratio		60.00%
Maximum [Member] | Required by Covenant [Member]
Line Of Credit Facility [Line Items]
Excess of Debt		$ 100,000,000
Five Year Unsecured Revolving Credit Agreement [Member] | Commercial Paper [Member] | Regulated Operation [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,500,000,000.0
Line of Credit Facility, Accordion Feature		250,000,000
Line of Credit Facility, Maximum Borrowing Capacity with Accordion Feature		$ 1,750,000,000.00
Five Year Unsecured Revolving Credit Agreement [Member] | Commercial Paper [Member] | Minimum [Member] | Regulated Operation [Member]
Line Of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.00%
Five Year Unsecured Revolving Credit Agreement [Member] | Commercial Paper [Member] | Maximum [Member] | Regulated Operation [Member]
Line Of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.25%
$25 Million Bank Loan Agreement [Member] | Unsecured Loan Agreement [Member] | Regulated Operation [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 25,000,000
Line of Credit Facility, Fair Value of Amount Outstanding		0
$10 Million Revolving Credit Note [Member] | Unsecured Revolving Credit Note [Member] | Regulated Operation [Member]
Line Of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		10,000,000
Line of Credit Facility, Remaining Borrowing Capacity		4,400,000
Line of Credit Facility, Fair Value of Amount Outstanding		0
Unsecured Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount		$ 450,000,000	$ 450,000,000
Debt Instrument, Interest Rate, Stated Percentage		8.50%	8.50%
Debt Instrument, Maturity Date		Mar. 15, 2019	Mar. 15, 2019
Unsecured Senior Notes Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount		$ 500,000,000	$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage		3.00%	3.00%
Debt Instrument, Maturity Date		Jun. 15, 2027	Jun. 15, 2027
Unsecured Senior Notes Due 2034 [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount		$ 200,000,000	$ 200,000,000
Debt Instrument, Interest Rate, Stated Percentage		5.95%	5.95%
Debt Instrument, Maturity Date		Oct. 15, 2034	Oct. 15, 2034
Unsecured Senior Notes Due 2041 [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount		$ 400,000,000	$ 400,000,000
Debt Instrument, Interest Rate, Stated Percentage		5.50%	5.50%
Debt Instrument, Maturity Date		Jun. 15, 2041	Jun. 15, 2041
Unsecured Senior Notes Due 2043 [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount		$ 500,000,000	$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage		4.15%	4.15%
Debt Instrument, Maturity Date		Jan. 15, 2043	Jan. 15, 2043
Unsecured Senior Notes Due 2044 [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount		$ 750,000,000	$ 750,000,000
Debt Instrument, Interest Rate, Stated Percentage		4.125%	4.125%
Debt Instrument, Maturity Date		Oct. 15, 2044	Oct. 15, 2044
Medium Term Notes Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount		$ 10,000,000	$ 10,000,000
Debt Instrument, Interest Rate, Stated Percentage		6.67%	6.67%
Debt Instrument, Maturity Date		Dec. 15, 2025	Dec. 15, 2025
Unsecured Debentures Due 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount		$ 150,000,000	$ 150,000,000
Debt Instrument, Interest Rate, Stated Percentage		6.75%	6.75%
Debt Instrument, Maturity Date		Jul. 15, 2028	Jul. 15, 2028
Multi-Draw Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Amount	[1]	$ 125,000,000	$ 125,000,000
Debt Instrument, Maturity Date		Sep. 22, 2019	Sep. 22, 2019

[1] Up to $200 million can be drawn under this term loan.

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Tax Cuts and Jobs Act of 2017 Impacts (Details) - USD ($)
$ in Thousands

3 Months Ended

6 Months Ended

12 Months Ended

Apr. 03, 2018

Mar. 31, 2018

Mar. 31, 2018

Mar. 31, 2017

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Federal Statutory Income Tax Rate, Pre TCJA, Percent

35.00%

35.00%

Federal Statutory Income Tax Rate, Post TCJA, Percent

21.00%

Blended Federal Statutory Income Tax Rate, Percent

24.50%

Deferred Tax Liabilities, TCJA Deduction

$ 903,500

Regulatory Liability, Excess Deferred Tax

$ 737,798

737,798

$ 0

One-Time Income Tax Benefit, TCJA

3,800

165,675

$ 0

Deferred Tax Assets, Charitable Contribution Carryforwards [Abstract]

Deferred Tax Assets, Charitable Contribution Carryforwards

5,200

$ 5,200

Charitable Contribution Carryforwards, Expiration Date, Minimum

Dec. 31, 2018

Charitable Contribution Carryforwards, Expiration Date, Maximum

Dec. 31, 2023

Valuation Allowance, Tax Credit Carryforward [Member]

Valuation and Qualifying Accounts Disclosure [Line Items]

Valuation Allowances and Reserves, Deductions

$ 4,200

Subsequent Event [Member]

Subsequent Event [Line Items]

Subsequent Event, Description

On April 3, 2018, we filed formula rate mechanisms in our Mid-Tex and West Texas service areas, seeking increases in operating income

Domestic Tax Authority [Member]

Operating Loss Carryforwards [Line Items]

Operating Loss Carryforwards

274,700

274,700

Tax Credit Carryforward, Amount

10,100

$ 10,100

Domestic Tax Authority [Member] | Minimum [Member]

Operating Loss Carryforwards [Line Items]

Operating Loss Carryforwards, Expiration Date

Dec. 31, 2029

Tax Credit Carryforward, Expected Refund Date

Dec. 31, 2019

Domestic Tax Authority [Member] | Maximum [Member]

Operating Loss Carryforwards [Line Items]

Tax Credit Carryforward, Expected Refund Date

Dec. 31, 2022

State and Local Jurisdiction [Member]

Operating Loss Carryforwards [Line Items]

Operating Loss Carryforwards

21,500

$ 21,500

Operating Loss Carryforwards, Federal Tax Effects

5,700

5,700

Tax Credit Carryforward, Amount

1,500

1,500

Tax Credit Carryforward, Federal Tax Effects

$ 400

$ 400

State and Local Jurisdiction [Member] | Minimum [Member]

Operating Loss Carryforwards [Line Items]

Operating Loss Carryforwards, Expiration Date

Dec. 31, 2018

State and Local Jurisdiction [Member] | Maximum [Member]

Operating Loss Carryforwards [Line Items]

Operating Loss Carryforwards, Expiration Date

Dec. 31, 2032

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Shareholders' Equity Components (Details) - USD ($)	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' equity, beginning balance	$ 3,898,666,000
Shareholders' equity, ending balance	4,721,346,000
Shareholders' Equity Other Disclosures [Abstract]
Debt and Equity Securities Authorized for Issuance	2,500,000,000.0
Debt And Equity Securities Available For Issuance	1,200,000,000
ATM Equity Distribution Offering Price, Maximum Amount	$ 500,000,000
ATM Equity Distribution, Shares Issued	0
Block Trade, shares authorized for issuance	4,558,404
Block Trade, Gross Proceeds	$ 400,000,000
Block Trade, Net Proceeds	395,100,000
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' equity, beginning balance	7,048,000	$ 4,484,000
Other comprehensive income (loss) before reclassifications	(167,000)	634,000
Amounts reclassified from accumulated other comprehensive income	(879,000)	68,000
Net current-period other comprehensive income (loss)	(1,046,000)	702,000
Shareholders' equity, ending balance	6,002,000	5,186,000
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Interest Rate Contract [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' equity, beginning balance	(112,302,000)	(187,524,000)
Other comprehensive income (loss) before reclassifications	20,454,000	95,271,000
Amounts reclassified from accumulated other comprehensive income	835,000	173,000
Net current-period other comprehensive income (loss)	21,289,000	95,444,000
Shareholders' equity, ending balance	(91,013,000)	(92,080,000)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Commodity Contract [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' equity, beginning balance		(4,982,000)
Other comprehensive income (loss) before reclassifications		9,847,000
Amounts reclassified from accumulated other comprehensive income		(4,865,000)
Net current-period other comprehensive income (loss)		4,982,000
Shareholders' equity, ending balance		0
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' equity, beginning balance	(105,254,000)	(188,022,000)
Other comprehensive income (loss) before reclassifications	20,287,000	105,752,000
Amounts reclassified from accumulated other comprehensive income	(44,000)	(4,624,000)
Net current-period other comprehensive income (loss)	20,243,000	101,128,000
Shareholders' equity, ending balance	$ (85,011,000)	$ (86,894,000)

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Shareholders' Equity AOCI Affected Line Item in the Statement of Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operation and maintenance expense		$ (161,073)	$ (132,239)	$ (290,640)	$ (257,177)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		241,431	259,061	449,448	436,955
Income Tax Expense		(62,439)	(97,049)	43,676	(160,905)
Interest charges		(27,304)	(26,944)	(58,813)	(57,974)
Purchased gas cost		626,960	427,494	993,877	738,799
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from continuing operations		421	(154)	44	4,624
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Operation and maintenance expense		1,139	(107)	1,139	(107)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		1,139	(107)	1,139	(107)
Income Tax Expense		(260)	39	(260)	39
Income (loss) from continuing operations		879	(68)	879	(68)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		(593)	(136)	(1,187)	7,694
Income Tax Expense		135	50	352	(3,002)
Income (loss) from continuing operations		(458)	(86)	(835)	4,692
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Commodity Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Purchased gas cost	[1]				7,967
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Interest Rate Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest charges		$ (593)	$ (136)	$ (1,187)	$ (273)

[1] Amount is presented as part of income from discontinued operations in the condensed consolidated statement of income.

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Interim Pension and Other Postretirement Benefits (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Pension Benefits [Member]
Components of net periodic pension cost [Abstract]
Service Cost		$ 4,575	$ 5,217	$ 9,135	$ 10,433
Interest Cost		6,433	6,297	12,863	12,594
Expected return on assets		(6,916)	(6,994)	(13,833)	(13,988)
Amortization of prior service (credit)/cost		(58)	(58)	(116)	(116)
Amortization of actuarial (gain) loss		3,085	4,249	6,174	8,498
Settlements		2,415	0	2,415	0
Net periodic pension cost		$ 9,534	$ 8,711	$ 16,638	$ 17,421
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost Abstract
Discount Rate		3.89%	3.73%	3.89%	3.73%
Rate of compensation increase		3.50%	3.50%	3.50%	3.50%
Expected return on plan assets		6.75%	7.00%	6.75%	7.00%
Supplemental Employee Retirement Plan [Member]
Components of net periodic pension cost [Abstract]
Settlements		$ (2,400)
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost Abstract
Discount Rate	4.12%	4.12%	3.73%	4.12%	3.73%
Rate of compensation increase		3.50%	3.50%	3.50%	3.50%
Current Year Benefit Plan Contributions [Abstract]
Change in Net Periodic Cost, Remainder of Year		$ 100
Other Benefits [Member]
Components of net periodic pension cost [Abstract]
Service Cost		3,019	$ 3,109	$ 6,039	$ 6,218
Interest Cost		2,727	2,670	5,454	5,340
Expected return on assets		(2,001)	(1,797)	(4,003)	(3,593)
Amortization of prior service (credit)/cost		3	(411)	6	(822)
Amortization of actuarial (gain) loss		(1,619)	(707)	(3,237)	(1,414)
Settlements		0	0	0	0
Net periodic pension cost		$ 2,129	$ 2,864	$ 4,259	$ 5,729
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Net Periodic Benefit Cost Abstract
Discount Rate		3.89%	3.73%	3.89%	3.73%
Expected return on plan assets		4.29%	4.45%	4.29%	4.45%
Current Year Benefit Plan Contributions [Abstract]
Contributions Actual				$ 7,500
Other Benefits [Member] | Minimum [Member]
Current Year Benefit Plan Contributions [Abstract]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year		$ 10,000		10,000
Other Benefits [Member] | Maximum [Member]
Current Year Benefit Plan Contributions [Abstract]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year		$ 20,000		$ 20,000

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Commitments and Contingencies Commitments and Contingencies (Details)
$ in Millions

3 Months Ended

Apr. 03, 2018

Mar. 31, 2018

USD ($)

MMcf

Loss Contingencies [Line Items]

Self-Insured Retention Expense | $

$ 1.0

Subsequent Event [Member]

Subsequent Event [Line Items]

Subsequent Event, Description

On April 3, 2018, we filed formula rate mechanisms in our Mid-Tex and West Texas service areas, seeking increases in operating income

Pending Litigation [Member]

Loss Contingencies [Line Items]

Loss Contingency, Damages Sought, Value | $

$ 1.0

Loss Contingency, Lawsuit Filing Date

March 29, 2018

Inventories Under Indexed Contracts [Member] | Distribution Segment [Member]

Long-term Purchase Commitment [Line Items]

Long Term Purchase Commitment Minimum Quantity Required Within One Year | MMcf

55,000

Long Term Purchase Commitment Minimum Quantity Required One To Three Years | MMcf

64,700

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Financial Instruments Descriptions (Details) $ in Millions	6 Months Ended
	Mar. 31, 2018 USD ($) MMcf
General Discussion Of Derivative Instruments And Hedging Activities [Abstract]
Minimum Hedge Percentage Of Anticipated Heating Season Gas	25.00%
Maximum Hedge Percentage Of Anticipated Heating Season Gas	50.00%
Hedge Percentage Of Anticipated Heating Season Gas	26.00%
Hedge Volume Of Anticipated Heating Season Gas | MMcf	15,000
Accumulated Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Interest Rate Agreements, Realized Gain (Loss), Net of Tax	$ (49.1)
Interest Rate Hedges, Senior Notes 2019 Issuance [Member]
Derivative [Line Items]
Notional Amount of Interest Rate Cash Flow Hedge Derivatives	450.0
Anticipated Debt Issuance, Amount	$ 450.0
Derivative, Average Forward Interest Rate	3.78%

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Financial Instruments Commodity Contract Volume (Details)	Mar. 31, 2018 MMcf
Nondesignated [Member]
Commodity Contract Outstanding Volumes [Line Items]
Investment Contract Volume	6,251

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Financial Instruments Balance Sheet Location (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Derivatives Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 602	$ 3,239
Derivative Asset, Contract Netting	0	0
Derivative Asset, Net of Contract Netting	602	3,239
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Asset	602	3,239
Derivative Liability, Fair Value, Gross Liability	(86,944)	(112,398)
Derivative Liability, Contract Netting	0	0
Derivative Liability, Net of Contract Netting	(86,944)	(112,398)
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	0	0
Derivative Liability	(86,944)	(112,398)
Designated As Hedging Instrument [Member]
Derivatives Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	(85,948)	(112,076)
Designated As Hedging Instrument [Member] | Other Current Assets [Member] | Interest Rate Contract [Member]
Derivatives Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Designated As Hedging Instrument [Member] | Deferred Charges and Other Assets [Member] | Interest Rate Contract [Member]
Derivatives Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		0
Designated As Hedging Instrument [Member] | Other Current Liabilities [Member] | Interest Rate Contract [Member]
Derivatives Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(85,948)
Designated As Hedging Instrument [Member] | Deferred Credits and Other Liabilities [Member] | Interest Rate Contract [Member]
Derivatives Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		(112,076)
Nondesignated [Member]
Derivatives Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	602	3,239
Derivative Liability, Fair Value, Gross Liability	(996)	(322)
Nondesignated [Member] | Other Current Assets [Member] | Commodity Contract [Member]
Derivatives Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	602	2,436
Nondesignated [Member] | Deferred Charges and Other Assets [Member] | Commodity Contract [Member]
Derivatives Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset		803
Nondesignated [Member] | Other Current Liabilities [Member] | Commodity Contract [Member]
Derivatives Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ (996)	(322)
Nondesignated [Member] | Deferred Credits and Other Liabilities [Member] | Commodity Contract [Member]
Derivatives Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability		$ 0

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Financial Instruments Cash Flow Hedges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Effect of Cash Flow Hedges on Results of Operations [Abstract]
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ (0.6)	$ (0.1)

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Financial Instruments Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	[1]	Mar. 31, 2018	Mar. 31, 2017
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Interest rate agreements fair value		$ 21,786	$ 4,144		$ 20,454	$ 95,271	[1]
Forward commodity contracts fair value	[2]	0	0		0	9,847	[1]
Interest rate agreements		458	86		835	173	[1]
Forward commodity contracts	[2]	0	0		0	(4,865)	[1]
Total other comprehensive income (loss) from hedging, net of tax		22,244	$ 4,230		21,289	$ 100,426	[1]
Regulated Segments Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate						37.00%
Nonregulated Segment Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate						39.00%
Expected Earnings [Line Items]
Expected Recognition in Earnings of Deferred Gain (Losses), Interest Rate Agreements		(49,114)			(49,114)
Next Twelve Months [Member]
Expected Earnings [Line Items]
Expected Recognition in Earnings of Deferred Gain (Losses), Interest Rate Agreements		(1,833)			(1,833)
Thereafter [Member]
Expected Earnings [Line Items]
Expected Recognition in Earnings of Deferred Gain (Losses), Interest Rate Agreements		$ (47,281)			$ (47,281)

[1] Utilizing an income tax rate ranging from 37 percent to 39 percent based on the effective rates in each taxing jurisdiction for the three and six-month period ended March 31, 2017.

[2] Due to the sale of AEM, these amounts are included in income from discontinued operations

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Fair Value Measurements (Details) - USD ($)		Mar. 31, 2018	Sep. 30, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		$ 0	$ 0
Derivative Asset		602,000	3,239,000
Available-for-sale Securities		93,665,000	88,409,000
Total assets		94,267,000	91,648,000
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset		0	0
Derivative Liability		86,944,000	112,398,000
Cash Held In Margin Accounts Classified Current Risk Management Asset		0	0
Cash Held In Margin Accounts Offset Current Risk Management Liabilities		0	0
Additional Fair Value Elements [Abstract]
Debt Instrument Carrying Amount		3,085,000,000	3,085,000,000
Debt Instrument Fair Value		3,291,629,000	3,382,272,000
Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		39,783,000	41,097,000
Fixed Income Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		16,308,000	16,371,000
Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		31,137,000	29,104,000
Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		6,437,000	1,837,000
Fair Value Inputs Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		0	0
Available-for-sale Securities		56,091,000	57,468,000
Total assets		56,091,000	57,468,000
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	0
Fair Value Inputs Level 1 [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		39,783,000	41,097,000
Fair Value Inputs Level 1 [Member] | Fixed Income Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		16,308,000	16,371,000
Fair Value Inputs Level 1 [Member] | Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Fair Value Inputs Level 1 [Member] | Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Fair Value Inputs Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	[1]	602,000	3,239,000
Available-for-sale Securities	[1]	37,574,000	30,941,000
Total assets	[1]	38,176,000	34,180,000
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	[1]	86,944,000	112,398,000
Fair Value Inputs Level 2 [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	0	0
Fair Value Inputs Level 2 [Member] | Fixed Income Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	0	0
Fair Value Inputs Level 2 [Member] | Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	31,137,000	29,104,000
Fair Value Inputs Level 2 [Member] | Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities	[1]	6,437,000	1,837,000
Fair Value Inputs Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement		0	0
Available-for-sale Securities		0	0
Total assets		0	0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement		0	0
Fair Value Inputs Level 3 [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Fair Value Inputs Level 3 [Member] | Fixed Income Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Fair Value Inputs Level 3 [Member] | Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		0	0
Fair Value Inputs Level 3 [Member] | Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale Securities		$ 0	$ 0

[1] Our Level 2 measurements consist of over-the-counter options and swaps which are valued using a market-based approach in which observable market prices are adjusted for criteria specific to each instrument, such as the strike price, notional amount or basis differences, municipal and corporate bonds which are valued based on the most recent available quoted market prices and money market funds which are valued at cost.

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Fair Value Measurements Available-For-Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 83,933	$ 77,244
Gross Unrealized Gain	10,229	11,203
Gross Unrealized Loss	(497)	(38)
Fair value	93,665	88,409
Available-for-sale Securities, Other Disclosure Items [Abstract]
Available-for-sale Securities, Supplemental Executive Benefit Plans	46,200	42,900
Equity Funds Domestic [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	25,515	25,361
Gross Unrealized Gain	8,194	8,920
Gross Unrealized Loss	(95)	0
Fair value	33,614	34,281
Equity Funds Foreign [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	4,138	4,581
Gross Unrealized Gain	2,031	2,235
Gross Unrealized Loss	0	0
Fair value	6,169	6,816
Fixed Income Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	16,548	16,391
Gross Unrealized Gain	0	2
Gross Unrealized Loss	(240)	(22)
Fair value	16,308	16,371
Debt Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	31,295	29,074
Gross Unrealized Gain	4	46
Gross Unrealized Loss	(162)	(16)
Fair value	31,137	29,104
Money Market Funds [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	6,437	1,837
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair value	$ 6,437	$ 1,837

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Divestitures and Acquisitions (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

6 Months Ended

12 Months Ended

Apr. 03, 2018

Mar. 31, 2018

Mar. 31, 2017

Mar. 31, 2018

Mar. 31, 2017

Sep. 30, 2017

Jan. 01, 2017

Disposal Group, Including Discontinued Operation, Additional Disclosures [Abstract]

Disposal Group, Including Discontinued Operation, Cash Purchase Price

$ 38,300

Disposal Group, Including Discontinued Operation, Working Capital Adjustment

109,000

Disposal Group, Including Discontinued Operation, Consideration

147,300

Disposal Group, Including Discontinued Operation, Consideration Placed in Escrow

$ 7,000

Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Diluted Share

$ 0.03

Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]

Income tax expense

$ 0

$ 6,841

Income from discontinued operations, net of tax

0

10,994

Gain on sale of discontinued operations, net of tax

$ 0

$ 2,716

0

2,716

Net income from discontinued operations

0

2,716

0

13,710

Summary of Cash Flow Hedge Activity [Abstract]

Gain (Loss) on Discontinuation of Cash Flow Hedge

0

10,579

Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation

0

$ 0

10,215

Subsequent Event [Member]

Subsequent Event [Line Items]

Subsequent Event, Description

On April 3, 2018, we filed formula rate mechanisms in our Mid-Tex and West Texas service areas, seeking increases in operating income

Natural Gas Marketing Segment [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]

Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]

Operating revenues

303,474

Purchased gas cost

277,554

Operating expenses

7,874

Operating income

18,046

Other nonoperating expense

(211)

Income from discontinued operations before income taxes

17,835

Income tax expense

6,841

Income from discontinued operations, net of tax

10,994

Gain on sale of discontinued operations, net of tax

2,716

2,716

Net income from discontinued operations

13,710

Discontinued Operation, Alternative Cash Flow Information [Abstract]

Depreciation and Amortization, Discontinued Operations

185

Capital Expenditure, Discontinued Operations

0

Noncash Change in Commodity Contract Cash Flow Hedges

(8,165)

Discontinued Operation, Additional Disclosures [Abstract]

Gain on Discontinuation of Cash Flow Hedge

10,600

Gain (Loss) On Hedge Ineffectiveness

3,400

Disposal Group, Including Discontinued Operation, Consideration Placed in Escrow Released

$ 3,000

Effect of Fair Value Hedges on Results of Operations [Abstract]

Commodity contracts

(9,567)

Fair value adjustment for natural gas inventory designated as the hedged item

12,858

Total (increase) decrease to purchased gas cost

3,291

Basis ineffectiveness

(597)

Timing ineffectiveness

3,888

Summary of Cash Flow Hedge Activity [Abstract]

Gain (loss) reclassified from AOCI into purchased gas cost for effective portion of commodity contracts

(2,612)

Gain (loss) arising from ineffective portion of commodity contracts

111

Gain (Loss) on Discontinuation of Cash Flow Hedge

10,579

Total impact on purchased gas cost

8,078

Gain (Loss) On Derivative Instruments Not Designated Hedges Net Pretax

$ 6,800

Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation

$ 10,215