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Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Pension Benefits [Member] |  |  |  |
Components of net periodic cost: |  |  |  |
Service cost | $ 11 | $ 31 | $ 22 | $ 62
Interest cost | 174 | 184 | 348 | 367
Expected return on plan assets | (133) | (119) | (266) | (237)
Recognized net actuarial loss (gain) | 46 | 106 | 92 | 212
Amortization of prior service cost | 0 | 7 | 0 | 14
Net periodic cost (benefit) | 98 | 209 | 196 | 418
Postretirement Health Coverage [Member] |  |  |  |
Components of net periodic cost: |  |  |  |
Service cost | 4 | 4 | 8 | 9
Interest cost | 13 | 13 | 26 | 26
Expected return on plan assets | 0 | 0 | 0 | 0
Recognized net actuarial loss (gain) | (30) | (38) | (60) | (77)
Amortization of prior service cost | (92) | (92) | (184) | (184)
Net periodic cost (benefit) | $ (105) | $ (113) | $ (210) | $ (226)

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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