Retirement benefits

6 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

Retirement benefits

Retirement benefits

Net pension benefit expense recognized included the following components:

	Three Months Ended				Six Months Ended
	December 31,				December 31,
	2020		2019		2020		2019
Service cost	$	19,389	$	21,449	$	42,199	$	40,998
Interest cost	25,755		35,851		51,172		69,844
Expected return on plan assets	(66,807)		(66,883)		(133,209)		(130,778)
Amortization of prior service cost	1,446		1,309		2,289		2,818
Amortization of net actuarial loss	52,829		42,779		105,160		82,340
Amortization of initial net obligation	4		5		9		9
Net pension benefit expense	$	32,616	$	34,510	$	67,620	$	65,231

During the three months ended December 31, 2020 and 2019, we recognized $385 and $510, respectively, in expense related to other postretirement benefits. During the six months ended December 31, 2020 and 2019, we recognized $770 and $967, respectively, in expense related to other postretirement benefits. Components of retirement benefits expense, other than service cost, are included in other (income), net in the Consolidated Statement of Income.