Pension and Post-retirement Benefits (Tables)

9 Months Ended

Jun. 30, 2019

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
	2018		2019		2018		2019		2018		2019		2018		2019
Service cost	$	1,385	$	1,309	$	83	$	79	$	4,153	$	3,929	$	251	$	237
Interest cost		2,530		2,567		1,078		1,088		7,761		7,700		3,234		3,264
Expected return		(3,508)		(3,561)		—		—		(10,807)		(10,708)		—		—
Amortizations		1,268		402		750		372		3,851		1,205		2,250		1,116
Net periodic benefit cost	$	1,675	$	717	$	1,911	$	1,539	$	4,958	$	2,126	$	5,735	$	4,617