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EMPLOYEE BENEFIT PLANS - Summary of Changes in the Fair Value of the Pension Plan's Level 3 Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Change in plan assets
Fair value of plan assets at beginning of year	$ 91,142	$ 94,897
Fair value of plan assets at end of year	86,103	91,142
Level 3
Change in plan assets
Fair value of plan assets at beginning of year	161	116
Unrealized gains (losses) relating to property still held at the reporting date	(78)	45
Fair value of plan assets at end of year	$ 83	$ 161

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.

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