Pension and Other Postretirement Benefit Plans (Tables)

9 Months Ended

Jun. 30, 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 June 30,
	Pension				Other Postretirement
	2023		2022		2023		2022
Service cost	$	31	$	4	$	19	$	42
Interest cost *	106		48		161		102
Expected return on plan assets *	—		—		—		—
Amortization:
Prior service credit	—		(66)		(92)		(91)
Net actuarial loss *	(5)		88		(177)		—
Net benefit cost	$	132	$	74	$	(89)	$	53

	Nine months ended June 30,
	Pension				Other Postretirement
	2023		2022		2023		2022
Service cost	$	119	$	389	$	57	$	124
Interest cost *	354		1,086		483		308
Expected return on plan assets *	—		(1,042)		—		—
Amortization:
Prior service credit	—		(85)		(274)		(273)
Net actuarial loss *	(21)		380		(531)		—
Settlement losses *	1,271		30,856		—		—
Net benefit cost	$	1,723	$	31,584	$	(265)	$	159
* Non-service components of pension and postretirement expense are included in other income (deductions), net.