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Debt | 9 Months Ended
--- | ---
Jun. 30, 2017
Debt Disclosure [Abstract] |
Debt | Debt The nature and terms of our debt instruments and credit facilities are described in detail in Note 5 in our Fiscal 2016 Financial Statements. Except as noted below, there were no material changes in the terms of our debt instruments during the nine months ended June 30, 2017. Long-term debt at June 30, 2017 and September 30, 2016 consisted of the following:
| June 30, 2017 |  | September 30, 2016
| (In thousands)
Unsecured 6.35% Senior Notes, due June 2017 | $ | — |  |  | $ | 250,000 |
Unsecured 8.50% Senior Notes, due 2019 | 450,000 |  |  | 450,000 |
Unsecured 3.00% Senior Notes, due 2027 | 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 |  |  | 500,000 |
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 2019 | 125,000 |  |  | — |
Total long-term debt | 3,085,000 |  |  | 2,460,000 |
Less: |  |  |
Original issue (premium) discount on unsecured senior notes and debentures | (4,370 | ) |  | 4,270 |
Debt issuance cost | 22,636 |  |  | 16,951 |
Current maturities | — |  |  | 250,000 |
| $ | 3,066,734 |  |  | $ | 2,188,779 |
On June 8, 2017, we completed a public offering of $500 million of 3.00% senior notes due 2027 and $250 million of 4.125% senior notes due 2044. The effective rate of these notes is 3.12% and 4.40%, after giving effect to the offering costs and the settlement of the associated forward starting interest rate swaps. The net proceeds (excluding the loss on the settlement of the interest rate swaps of $37 million) of approximately $753 million were used to repay our $250 million 6.35% senior unsecured notes at maturity on June 15, 2017 and for general corporate purposes, including the repayment of working capital borrowings pursuant to our commercial paper program. On September 22, 2016, we entered into a three year, $200 million multi-draw floating-rate term loan agreement with a syndicate of three lenders. Borrowings under the term loan may be made in increments of $1.0 million or higher, may be repaid at any time during the loan period and will bear interest at a rate dependent upon our credit ratings at the time of such borrowing and based, at our election, on a base rate or LIBOR for the applicable interest period. The term loan was used to repay short-term debt and for working capital, capital expenditures and other general corporate purposes. At June 30, 2017, there was $125.0 million outstanding under the term loan. We utilize short-term debt to fund ongoing working capital needs, such as our seasonal requirements for gas supply, general corporate liquidity and capital expenditures. 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. We currently finance our short-term borrowing requirements 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 that expires September 25, 2021. 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. This facility was amended in October 2016 to increase the total availability from $1.25 billion. At June 30, 2017 and September 30, 2016 a total of $258.6 million and $829.8 million was outstanding under our commercial paper program. Additionally, we have a $25 million unsecured facility, which was renewed on April 1, 2017, and a $10 million unsecured revolving credit facility, which is used primarily to issue letters of credit. At June 30, 2017, 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 unsecured revolving facility to $4.1 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 June 30, 2017, our total-debt-to-total-capitalization ratio, as defined in the agreements, was 47 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 June 30, 2017. 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. AEM had one uncommitted $25 million 364-day bilateral credit facility that was scheduled to expire on July 31, 2017 and one committed $15 million 364-day bilateral credit facility that was scheduled to expire on September 30, 2017. In connection with the sale of AEM discussed in Note 6, both facilities were terminated on January 3, 2017.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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