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Employee Benefit Plans (Tables)
3 Months Ended
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Periodic Benefit Costs
The net periodic benefit cost for the defined benefit pension plans is as follows:
 
 
Three Months Ended
September 30,
 
 
2017
 
2016
(In thousands)
 
 
Service cost
 
$

 
$
124

Interest cost
 
1,432

 
1,397

Expected return on plan assets
 
(1,456
)
 
(1,607
)
Amortization of net loss(1)
 
418

 
508

Net periodic benefit cost
 
$
394

 
$
422

___________
(1) These amounts represent the estimated portion of the net loss in AOCI that is expected to be recognized as a component of net periodic benefit cost over the current fiscal year. 
Pension Plan  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Assumptions Used [Table Text Block]
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost
 
Fiscal
 
2018
 
2017
Discount rate
3.80%
 
3.55%
Expected long-term return on plan assets
6.75%
 
7.75%
Other Postretirement Benefit Plan  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Periodic Benefit Costs
The following table shows the components of net periodic postretirement benefit cost for the Retiree Medical Plan and Death Benefit for the three months ended September 30, 2017 and 2016. Net periodic postretirement benefit cost for the three months ended September 30, 2017 was based on employee census information and asset information as of June 30, 2017. 
 
 
Three Months Ended
September 30,
 
 
2017
 
2016
(In thousands)
 
 
 
 
Service cost
 
$
152

 
$
190

Interest cost
 
209

 
207

Amortization of net gain
 
(210
)
 
(157
)
Amortization of prior service credit
 
(439
)
 
(439
)
Net periodic postretirement benefit credit
 
$
(288
)
 
$
(199
)

Schedule of Assumptions Used [Table Text Block]
Weighted-Average Assumptions Used to Determine Net Periodic Postretirement Benefit Cost 
 
Fiscal
 
2018
 
2017
Retiree Medical Plan discount rate
4.13%
 
3.73%
Death Benefit discount rate
4.12%
 
3.79%