EMPLOYEE BENEFIT PLANS - DEFINED CONTRIBUTION (Details) - USD ($) $ in Millions	1 Months Ended	5 Months Ended	12 Months Ended
	Mar. 31, 2024	Feb. 29, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Defined contribution, company match of employee contribution		85.00%
Defined contribution plan, maximum employer contribution by percentage of employee salary		6.00%
Defined contribution plan, cost recognized			$ 7.2	$ 6.8	$ 5.9
Deferred compensation arrangement with individual, employer contribution			$ 4.2	$ 3.6	$ 2.1
First Matching Tier
Defined Benefit Plan Disclosure [Line Items]
Defined contribution, company match of employee contribution	100.00%
Defined contribution plan, maximum employer contribution by percentage of employee salary	3.00%
Second Matching Tier
Defined Benefit Plan Disclosure [Line Items]
Defined contribution, company match of employee contribution	80.00%
Defined contribution plan, maximum employer contribution by percentage of employee salary	3.00%
NJRHS | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contribution for employees not qualifying for the defined benefit plan			4.00%
NJRHS | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contribution for employees not qualifying for the defined benefit plan			5.00%