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Retirement benefits (Tables)
 3 Months Ended
Sep. 30, 2017
Pension Plans  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of defined benefit plans disclosures
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