Employee Benefit Plans - Schedule of vesting by participant age (Details) - SERP	12 Months Ended
	Sep. 30, 2023
Before 62
Defined Benefit Plan Disclosure [Line Items]
Vested Percentage	0.00%
62
Defined Benefit Plan Disclosure [Line Items]
Vested Percentage	80.00%
63
Defined Benefit Plan Disclosure [Line Items]
Vested Percentage	90.00%
64
Defined Benefit Plan Disclosure [Line Items]
Vested Percentage	100.00%