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Employee Benefit Plans (Tables)
3 Months Ended
Sep. 30, 2018
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 31,
 
 
2018
 
2017
(In thousands)
 
 
Service cost
 
$

 
$

Interest cost
 
1,426

 
1,432

Expected return on plan assets
 
(1,485
)
 
(1,456
)
Amortization of net loss(1)
 
370

 
418

Net periodic benefit cost
 
$
311

 
$
394

___________
(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
 
 
2019
 
2018
Discount rate
 
4.05%
 
3.80%
Expected long-term return on plan assets
 
6.75%
 
6.75%
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, 2018 and 2017. Net periodic postretirement benefit cost for the three months ended September 30, 2018 was based on employee census information and asset information as of June 30, 2018. 
 
 
Three Months Ended September 30,
 
 
2018
 
2017
(In thousands)
 
 
 
 
Components of Net Periodic Postretirement Benefit Cost (Credit):
 
 
 
 
Service cost
 
$
133

 
$
152

Interest cost
 
222

 
209

Amortization of net gain
 
(209
)
 
(210
)
Amortization of prior service credit
 
(439
)
 
(439
)
Net periodic postretirement benefit credit
 
$
(293
)
 
$
(288
)
Schedule of Assumptions Used [Table Text Block]
Weighted-Average Assumptions Used to Determine Net Periodic Postretirement Benefit Cost 
 
 
Fiscal
 
 
2019
 
2018
Retiree Medical Plan discount rate
 
4.25%
 
4.13%
Death Benefit discount rate
 
4.25%
 
4.12%