XML 30 R19.htm IDEA: XBRL DOCUMENT v3.8.0.1
Retirement benefits
 3 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Retirement benefits
Retirement benefits
Net pension benefit cost recognized included the following components:
 
 
Three Months Ended
 
September 30,
 
2017
 
2016
Service cost
$
23,058

 
$
24,223

Interest cost
35,686

 
31,496

Expected return on plan assets
(63,176
)
 
(57,617
)
Amortization of prior service cost
2,104

 
1,716

Amortization of net actuarial loss
38,682

 
51,427

Amortization of initial net obligation
5

 
5

Net pension benefit cost
$
36,359

 
$
51,250


During the three months ended September 30, 2017 and 2016, the Company recognized $1,089 and $1,116, respectively, in expense related to other postretirement benefits.