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Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Pension Benefits [Member] |  |  |  |
Components of net periodic cost: |  |  |  |
Service cost | $ 11 | $ 31 | $ 33 | $ 93
Interest cost | 174 | 182 | 522 | 549
Expected return on plan assets | (133) | (118) | (399) | (355)
Recognized net actuarial loss (gain) | 46 | 106 | 138 | 318
Amortization of prior service cost | 0 | 7 | 0 | 21
Net periodic cost (benefit) | 98 | 208 | 294 | 626
Postretirement Health Coverage [Member] |  |  |  |
Components of net periodic cost: |  |  |  |
Service cost | 4 | 5 | 12 | 14
Interest cost | 13 | 13 | 39 | 39
Expected return on plan assets | 0 | 0 | 0 | 0
Recognized net actuarial loss (gain) | (30) | (39) | (90) | (116)
Amortization of prior service cost | (92) | (92) | (276) | (276)
Net periodic cost (benefit) | $ (105) | $ (113) | $ (315) | $ (339)

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