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FAIR VALUE (Tables) | 3 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping | The estimated fair value of long-term debt, including current maturities and excluding capital leases, is as follows:
(Thousands) | December 31, 2013 | September 30, 2013
Carrying value | $ | 529,845 |  | $ | 529,845 |
Fair market value | $ | 553,460 |  | $ | 556,518 |
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis | Assets and liabilities measured at fair value on a recurring basis are summarized as follows:
| Quoted Prices in Active Markets for Identical Assets | Significant Other Observable Inputs | Significant Unobservable Inputs |
(Thousands) | (Level 1) | (Level 2) | (Level 3) | Total
As of December 31, 2013: |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |
Physical forward commodity contracts |  | $ | — |  |  |  | $ | 9,056 |  |  |  | $ | — |  |  | $ | 9,056 |
Financial derivative contracts - natural gas |  | 27,716 |  |  |  | — |  |  |  | — |  |  | 27,716 |
Financial derivative contracts - foreign exchange |  | — |  |  |  | 2 |  |  |  | — |  |  | 2 |
Available for sale equity securities - energy industry (1) |  | 11,192 |  |  |  | — |  |  |  | — |  |  | 11,192 |
Other (2) |  | 1,442 |  |  |  | — |  |  |  | — |  |  | 1,442 |
Total assets at fair value |  | $ | 40,350 |  |  |  | $ | 9,058 |  |  |  | $ | — |  |  | $ | 49,408 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Physical forward commodity contracts |  | $ | — |  |  |  | $ | 29,416 |  |  |  | $ | — |  |  | $ | 29,416 |
Financial derivative contracts - natural gas |  | 54,521 |  |  |  | — |  |  |  | — |  |  | 54,521 |
Financial derivative contracts - foreign exchange |  | — |  |  |  | 45 |  |  |  | — |  |  | 45 |
Total liabilities at fair value |  | $ | 54,521 |  |  |  | $ | 29,461 |  |  |  | $ | — |  |  | $ | 83,982 |
As of September 30, 2013: |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |
Physical forward commodity contracts |  | $ | — |  |  |  | $ | 11,823 |  |  |  | $ | — |  |  | $ | 11,823 |
Financial derivative contracts - natural gas |  | 44,249 |  |  |  | — |  |  |  | — |  |  | 44,249 |
Financial derivative contracts - foreign exchange |  | — |  |  |  | 16 |  |  |  | — |  |  | 16 |
Available for sale equity securities - energy industry (1) |  | 11,716 |  |  |  | — |  |  |  | — |  |  | 11,716 |
Other (2) |  | 1,129 |  |  |  | — |  |  |  | — |  |  | 1,129 |
Total assets at fair value |  | $ | 57,094 |  |  |  | $ | 11,839 |  |  |  | $ | — |  |  | $ | 68,933 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Physical forward commodity contracts |  | $ | — |  |  |  | $ | 14,595 |  |  |  | $ | — |  |  | $ | 14,595 |
Financial derivative contracts - natural gas |  | 28,248 |  |  |  | — |  |  |  | — |  |  | 28,248 |
Financial derivative contracts - foreign exchange |  | — |  |  |  | 5 |  |  |  | — |  |  | 5 |
Total liabilities at fair value |  | $ | 28,248 |  |  |  | $ | 14,600 |  |  |  | $ | — |  |  | $ | 42,848 |
(1) | Included in Other noncurrent assets on the Unaudited Condensed Consolidated Balance Sheets.
(2) | Includes various money market funds.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&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 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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