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EMPLOYEE BENEFIT PLANS (Details 2) - USD ($) $ in Thousands | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
--- | --- | --- | ---
PLAN ASSETS |  |  |
Fair value of plan assets | $ 98,060 | $ 108,157 | $ 96,818
Oil and Gas Properties |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 387 | 301 | $ 287
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 97,673 | 107,856 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments. |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 2,248 | 2,250 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds: |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 78,060 | 88,507 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic stock funds |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 40,072 | 55,054 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Bond funds |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 25,344 | 24,722 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International stock funds |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 12,644 | 8,731 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic common stock |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 15,883 | 15,733 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign equity stock |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 1,482 | 1,366 |
Significant Unobservable Inputs (Level 3) |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 387 | 301 |
Significant Unobservable Inputs (Level 3) | Oil and Gas Properties |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 387 | 301 |
Total Measure at Fair Value |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 98,060 | 108,157 |
Total Measure at Fair Value | Short-term investments. |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 2,248 | 2,250 |
Total Measure at Fair Value | Mutual funds: |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 78,060 | 88,507 |
Total Measure at Fair Value | Domestic stock funds |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 40,072 | 55,054 |
Total Measure at Fair Value | Bond funds |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 25,344 | 24,722 |
Total Measure at Fair Value | International stock funds |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 12,644 | 8,731 |
Total Measure at Fair Value | Domestic common stock |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 15,883 | 15,733 |
Total Measure at Fair Value | Foreign equity stock |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | 1,482 | 1,366 |
Total Measure at Fair Value | Oil and Gas Properties |  |  |
PLAN ASSETS |  |  |
Fair value of plan assets | $ 387 | $ 301 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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