Pension and Other Postretirement Benefit Plans (Tables)

6 Months Ended

Mar. 31, 2023

Retirement Benefits [Abstract]

Net Periodic Pension and Other Postretirement Benefit Cost

Net periodic pension and other postretirement benefit cost for the plans included the following:

	Three months ended March 31,
	Pension				Other Postretirement
	2023		2022		2023		2022
Service cost	$	31	$	5	$	19	$	41
Interest cost *	105		48		161		103
Expected return on plan assets *	—		—		—		—
Amortization:
Prior service credit	—		(66)		(91)		(91)
Net actuarial loss *	(6)		91		(177)		—
Net benefit cost	$	130	$	78	$	(88)	$	53

	Six months ended March 31,
	Pension				Other Postretirement
	2023		2022		2023		2022
Service cost	$	88	$	385	$	38	$	82
Interest cost *	248		1,038		322		206
Expected return on plan assets *	—		(1,042)		—		—
Amortization:
Prior service credit	—		(19)		(182)		(182)
Net actuarial loss *	(16)		292		(354)		—
Settlement losses *	1,271		30,856		—		—
Net benefit cost	$	1,591	$	31,510	$	(176)	$	106
* Non-service components of pension and postretirement expense are included in other income (deductions), net.