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Retirement benefits
6 Months Ended
Dec. 31, 2019
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,
 
2019
 
2018
 
2019
 
2018
Service cost
$
21,449

 
$
17,983

 
$
40,998

 
$
38,492

Interest cost
35,851

 
40,551

 
69,844

 
80,417

Expected return on plan assets
(66,883
)
 
(62,701
)
 
(130,778
)
 
(125,578
)
Amortization of prior service cost
1,309

 
1,677

 
2,818

 
3,325

Amortization of net actuarial loss
42,779

 
30,692

 
82,340

 
59,985

Amortization of initial net obligation
5

 
4

 
9

 
9

Net pension benefit expense
$
34,510

 
$
28,206

 
$
65,231

 
$
56,650


During the three months ended December 31, 2019 and 2018, we recognized $510 and $631, respectively, in expense related to other postretirement benefits. During the six months ended December 31, 2019 and 2018, we recognized $967 and $1,281, 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.