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Retirement benefits
 3 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Retirement benefits
Retirement benefits
Net pension benefit cost recognized included the following components:
 
Three Months Ended
 
September 30,
 
2018
 
2017
Service cost
$
20,509

 
$
23,058

Interest cost
39,866

 
35,686

Expected return on plan assets
(62,877
)
 
(63,176
)
Amortization of prior service cost
1,648

 
2,104

Amortization of net actuarial loss
29,293

 
38,682

Amortization of initial net obligation
4

 
5

Net pension benefit cost
$
28,443

 
$
36,359


During the three months ended September 30, 2018 and 2017, the Company recognized $650 and $1,089, respectively, in expense related to other postretirement benefits. Components of net pension benefit cost and other postretirement benefit cost, other than service cost, are included in other (income) expense, net in the Consolidated Statement of Income.
In September 2018, the Company made a discretionary $200 million cash contribution to its domestic qualified defined benefit plan.