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Pension and Postretirement Benefit Plans (Tables)
 6 Months Ended
Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Net Benefit Costs
The following table presents the components of net periodic benefit costs:

 
Three Months
 
 
Six Months
Periods ended December 31,
2015
 
2014
 
 
2015
 
2014
(In thousands)
 
 
 
 
 
 
 
 
Pension benefits
 
 
 
 
 
 
 
 
Service cost
$
2,977

 
$
3,043

 
 
$
5,954

 
$
6,086

Interest cost
1,469

 
1,396

 
 
2,938

 
2,792

Expected return on plan assets
(2,746
)
 
(2,759
)
 
 
(5,492
)
 
(5,518
)
Prior service cost amortization
49

 
56

 
 
98

 
112

Actuarial loss amortization
157

 
169

 
 
314

 
338

Net periodic benefit costs
$
1,906

 
$
1,905

 
 
$
3,812

 
$
3,810

 
 
 
 
 
 
 
 
 
Postretirement benefits
 
 
 
 
 
 
 
 
Service cost
$
25

 
$
29

 
 
$
50

 
$
58

Interest cost
96

 
102

 
 
192

 
204

Prior service cost amortization
(107
)
 
(108
)
 
 
(214
)
 
(216
)
Actuarial gain amortization
(169
)
 
(108
)
 
 
(338
)
 
(216
)
Net periodic benefit credit
$
(155
)
 
$
(85
)
 
 
$
(310
)
 
$
(170
)