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Retirement benefits (Tables)
9 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of net pension benefit cost
Net pension benefit cost recognized included the following components:
 
Three Months Ended
 
Nine Months Ended
 
March 31,
 
March 31,
 
2019
 
2018
 
2019
 
2018
Service cost
$
19,126

 
$
20,711

 
$
57,618

 
$
62,011

Interest cost
40,124

 
36,027

 
120,541

 
107,851

Expected return on plan assets
(62,844
)
 
(64,437
)
 
(188,422
)
 
(192,963
)
Amortization of prior service cost
1,665

 
1,575

 
4,990

 
5,190

Amortization of net actuarial loss
29,988

 
36,278

 
89,973

 
110,428

Amortization of initial net obligation
4

 
4

 
13

 
14

Net pension benefit cost
$
28,063

 
$
30,158

 
$
84,713

 
$
92,531