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Employee Benefit Plans (Tables) | 6 Months Ended
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Dec. 31, 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 December 31, |  | Six Months Ended December 31,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
(In thousands) |  |  |  |
Service cost |  | $ | — |  |  | $ | 124 |  |  | $ | — |  |  | $ | 248 |
Interest cost |  | 1,432 |  |  | 1,397 |  |  | 2,864 |  |  | 2,794 |
Expected return on plan assets |  | (1,456 | ) |  | (1,607 | ) |  | (2,912 | ) |  | (3,214 | )
Amortization of net loss(1) |  | 418 |  |  | 508 |  |  | 836 |  |  | 1,016 |
Net periodic benefit cost |  | $ | 394 |  |  | $ | 422 |  |  | $ | 788 |  |  | $ | 844 |
___________ (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 and six months ended December 31, 2017 and 2016. Net periodic postretirement benefit cost for the three and six months ended December 31, 2017 was based on employee census information and asset information as of June 30, 2017.
|  | Three Months Ended December 31, |  | Six Months Ended December 31,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
(In thousands) |  |  |  |  |  |  |  |
Service cost |  | $ | 152 |  |  | $ | 190 |  |  | $ | 304 |  |  | $ | 380 |
Interest cost |  | 209 |  |  | 207 |  |  | 418 |  |  | 414 |
Amortization of net gain |  | (210 | ) |  | (157 | ) |  | (420 | ) |  | (314 | )
Amortization of prior service credit |  | (439 | ) |  | (439 | ) |  | (878 | ) |  | (878 | )
Net periodic postretirement benefit credit |  | $ | (288 | ) |  | $ | (199 | ) |  | $ | (576 | ) |  | $ | (398 | )
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%

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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