Pension and Post-retirement Benefits (Tables)

9 Months Ended

Jun. 30, 2020

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
	2019		2020		2019		2020		2019		2020		2019		2020
Service cost	$	1,309	$	1,386	$	79	$	354	$	3,929	$	4,159	$	237	$	1,062
Interest cost		2,567		2,148		1,088		874		7,700		6,444		3,264		2,620
Expected return		(3,561)		(3,639)		—		—		(10,708)		(10,907)		—		—
Amortizations		402		1,860		372		462		1,205		5,578		1,116		1,386
Net periodic benefit cost	$	717	$	1,755	$	1,539	$	1,690	$	2,126	$	5,274	$	4,617	$	5,068