Pension Plan and Retirement Benefits (Tables)

9 Months Ended

Jun. 30, 2022

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
	2021		2022		2021		2022		2021		2022		2021		2022
Service cost	$	1,407	$	1,182	$	274	$	456	$	4,221	$	3,546	$	822	$	1,368
Interest cost		1,808		1,923		572		559		5,424		5,769		1,718		1,677
Expected return		(3,978)		(3,561)		—		—		(11,934)		(10,683)		—		—
Amortizations		1,956		51		—		(60)		5,868		153		—		(180)
Net periodic benefit cost	$	1,193	$	(405)	$	846	$	955	$	3,579	$	(1,215)	$	2,540	$	2,865