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Fair Value Measurements | 9 Months Ended
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Jun. 30, 2017
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 of our Fiscal 2016 Financial Statements. During the nine months ended June 30, 2017, 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 of our Fiscal 2016 Financial Statements. 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 June 30, 2017 and September 30, 2016. 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 |  | June 30, 2017
| (In thousands)
Assets: |  |  |  |  |  |  |  |  |
Financial instruments | $ | — |  |  | $ | 3,228 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,228 |
Available-for-sale securities |  |  |  |  |  |  |  |  |
Registered investment companies | 39,406 |  |  | — |  |  | — |  |  | — |  |  | 39,406 |
Bond mutual funds | 15,892 |  |  | — |  |  | — |  |  | — |  |  | 15,892 |
Bonds | — |  |  | 31,429 |  |  | — |  |  | — |  |  | 31,429 |
Money market funds | — |  |  | 2,884 |  |  | — |  |  | — |  |  | 2,884 |
Total available-for-sale securities | 55,298 |  |  | 34,313 |  |  | — |  |  | — |  |  | 89,611 |
Total assets | $ | 55,298 |  |  | $ | 37,541 |  |  | $ | — |  |  | $ | — |  |  | $ | 92,839 |
Liabilities: |  |  |  |  |  |  |  |  |
Financial instruments | $ | — |  |  | $ | 109,372 |  |  | $ | — |  |  | $ | — |  |  | $ | 109,372 |
| Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2)(1) |  | Significant Other Unobservable Inputs (Level 3) |  | Netting and Cash Collateral(2) |  | September 30, 2016
| (In thousands)
Assets: |  |  |  |  |  |  |  |  |
Financial instruments | $ | — |  |  | $ | 44,141 |  |  | $ | — |  |  | $ | (32,515 | ) |  | $ | 11,626 |
Hedged portion of gas stored underground | 52,578 |  |  | — |  |  | — |  |  | — |  |  | 52,578 |
Available-for-sale securities |  |  |  |  |  |  |  |  |
Registered investment companies | 38,677 |  |  | — |  |  | — |  |  | — |  |  | 38,677 |
Bonds | — |  |  | 31,394 |  |  | — |  |  | — |  |  | 31,394 |
Money market funds | — |  |  | 2,630 |  |  | — |  |  | — |  |  | 2,630 |
Total available-for-sale securities | 38,677 |  |  | 34,024 |  |  | — |  |  | — |  |  | 72,701 |
Total assets | $ | 91,255 |  |  | $ | 78,165 |  |  | $ | — |  |  | $ | (32,515 | ) |  | $ | 136,905 |
Liabilities: |  |  |  |  |  |  |  |  |
Financial instruments | $ | — |  |  | $ | 323,684 |  |  | $ | — |  |  | $ | (82,865 | ) |  | $ | 240,819 |
(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.
(2) | This column reflects adjustments to our gross financial instrument assets and liabilities to reflect netting permitted under our master netting agreements and the relevant authoritative accounting literature. As of September 30, 2016, we had $50.4 million of cash held in margin accounts to collateralize certain financial instruments. Of this amount, $43.6 million was used to offset current and noncurrent risk management liabilities under master netting arrangements with the remaining $6.8 million classified as current risk management assets.
Available-for-sale securities are comprised of the following:
| Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
| (In thousands)
As of June 30, 2017 |  |  |  |  |  |  |
Domestic equity mutual funds | $ | 25,236 |  |  | $ | 7,749 |  |  | $ | (17 | ) |  | $ | 32,968 |
Foreign equity mutual funds | 4,581 |  |  | 1,857 |  |  | — |  |  | 6,438 |
Bond mutual funds | 15,928 |  |  | — |  |  | (36 | ) |  | 15,892 |
Bonds | 31,407 |  |  | 52 |  |  | (30 | ) |  | 31,429 |
Money market funds | 2,884 |  |  | — |  |  | — |  |  | 2,884 |
| $ | 80,036 |  |  | $ | 9,658 |  |  | $ | (83 | ) |  | $ | 89,611 |
As of September 30, 2016 |  |  |  |  |  |  |
Domestic equity mutual funds | $ | 26,692 |  |  | $ | 6,419 |  |  | $ | (590 | ) |  | $ | 32,521 |
Foreign equity mutual funds | 4,954 |  |  | 1,202 |  |  | — |  |  | 6,156 |
Bonds | 31,296 |  |  | 108 |  |  | (10 | ) |  | 31,394 |
Money market funds | 2,630 |  |  | — |  |  | — |  |  | 2,630 |
| $ | 65,572 |  |  | $ | 7,729 |  |  | $ | (600 | ) |  | $ | 72,701 |
At June 30, 2017 and September 30, 2016, our available-for-sale securities included $42.3 million and $41.3 million related to assets held in separate rabbi trusts for our supplemental executive benefit plans. At June 30, 2017, we maintained investments in bonds that have contractual maturity dates ranging from July 2017 through December 2020. 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 June 30, 2017 and September 30, 2016:
| June 30, 2017 |  | September 30, 2016
| (In thousands)
Carrying Amount | $ | 3,085,000 |  |  | $ | 2,460,000 |
Fair Value | $ | 3,388,003 |  |  | $ | 2,844,990 |

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13504-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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