EMPLOYEE BENEFIT PLANS - Significant unobservable inputs (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of fiscal year	$ 160,523
Fair value of plan assets at end of fiscal year	144,091	$ 160,523
Fair Value, Inputs, Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of fiscal year	11,286	9,362
Purchases, issuances and settlements	150
Gains and losses	(1,952)	1,924
Fair value of plan assets at end of fiscal year	$ 9,484	$ 11,286