Pension and Post-retirement Benefits (Tables)

9 Months Ended

Jun. 30, 2023

Pension and Post-retirement Benefits

Schedule of components of net periodic pension and postretirement benefit cost

	Three Months Ended June 30,								Nine Months Ended June 30,
	Pension Benefits				Other Benefits				Pension Benefits				Other Benefits
	2022		2023		2022		2023		2022		2023		2022		2023
Service cost	$	1,182	$	672	$	456	$	348	$	3,546	$	2,016	$	1,368	$	1,042
Interest cost		1,923		2,772		559		799		5,769		8,316		1,677		2,399
Expected return		(3,561)		(3,419)		—		—		(10,683)		(10,257)		—		—
Amortizations		51		52		(60)		(569)		153		154		(180)		(1,709)
Net periodic benefit cost	$	(405)	$	77	$	955	$	578	$	(1,215)	$	229	$	2,865	$	1,732