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EMPLOYEE BENEFIT PLANS - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 87,255	$ 86,103	$ 91,142
Fair value
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	87,255	86,103
Fair value | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,444	1,541
Fair value | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	84,790	84,479
Fair value | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	35,212	35,660
Fair value | Bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	17,679	17,328
Fair value | Balanced funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	17,520	17,447
Fair value | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	14,379	14,044
Fair value | Oil and gas properties
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	21	83
Fair value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	87,234	86,020
Fair value | Level 1 | Short-term investments
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	2,444	1,541
Fair value | Level 1 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	84,790	84,479
Fair value | Level 1 | Domestic stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	35,212	35,660
Fair value | Level 1 | Bond funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	17,679	17,328
Fair value | Level 1 | Balanced funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	17,520	17,447
Fair value | Level 1 | International stock funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of pension plan assets	14,379	14,044
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 | Balanced 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	21	83
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 | Balanced 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	$ 21	$ 83

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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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