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ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
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Sep. 30, 2016
Asset Retirement Obligation Disclosure [Abstract] |
Analysis of Change in ARO Liability | The following is an analysis of the change in the Company’s AROs for the fiscal year ended September 30:
(Thousands) | 2016 |  | 2015
Balance at October 1 | $ | 19,145 |  |  | $ | 30,495 |
Accretion | 1,206 |  |  | 2,262 |
Additions | 3,111 |  |  | 2,185 |
Revisions in estimated cash flows | 5,320 |  |  | (14,763 | )
Retirements | (403 | ) |  | (1,034 | )
Balance at period end | $ | 28,379 |  |  | $ | 19,145 |
Schedule of Future Accretion | Accretion for the next five years is estimated to be as follows:
(Thousands) |  |  |
Fiscal Year Ended September 30, | Estimated Accretion
2017 |  | $ | 1,552 |  |
2018 |  | 1,639 |  |
2019 |  | 1,712 |  |
2020 |  | 1,789 |  |
2021 |  | 1,870 |  |
Total |  | $ | 8,562 |  |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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