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Pension and Postretirement Benefit Plans (Tables)
 3 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Costs
The following table presents the components of net periodic benefit costs:

Three months ended September 30,
2017
 
2016
(In thousands)
 
 
 
Pension benefits
 
 
 
Service cost
$
3,251

 
$
3,137

Interest cost
1,470

 
1,225

Expected return on plan assets
(2,616
)
 
(2,298
)
Prior service cost amortization
72

 
48

Actuarial loss amortization
513

 
897

Net periodic benefit costs
$
2,690

 
$
3,009

 
 
 
 
Postretirement benefits
 
 
 
Service cost
$
19

 
$
23

Interest cost
82

 
80

Prior service credit amortization
(85
)
 
(98
)
Actuarial gain amortization
(81
)
 
(78
)
Net periodic benefit credit
$
(65
)
 
$
(73
)