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Retirement benefits (Tables)
3 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of defined benefit plans disclosures
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