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EMPLOYEE BENEFIT PLANS - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 53,521	$ 43,780	$ 41,764
Fair value
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	53,521	43,780
Fair value | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	3,369	1,018
Fair value | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	50,060	42,738
Fair value | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	5,223	7,299
Fair value | Bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	41,950	30,319
Fair value | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,887	5,120
Fair value | Oil and gas properties
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	92	24
Fair value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	53,429	43,756
Fair value | Level 1 | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	3,369	1,018
Fair value | Level 1 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	50,060	42,738
Fair value | Level 1 | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	5,223	7,299
Fair value | Level 1 | Bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	41,950	30,319
Fair value | Level 1 | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,887	5,120
Fair value | Level 1 | Oil and gas properties
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | Bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 2 | Oil and gas properties
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	92	24
Fair value | Level 3 | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3 | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3 | Bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3 | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	0	0
Fair value | Level 3 | Oil and gas properties
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 92	$ 24

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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