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Retirement Plans and Postretirement Costs (Details 6) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 30, 2017
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Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | $ 111,466 | $ 112,524
Cash and Cash Equivalents |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | 7,617 | 7,233
Level 1 |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | 14,341 | 48,042
Level 2 |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | 97,125 | 64,482
Level 2 | Cash and Cash Equivalents |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | 7,617 | 7,233
Equity investments | Small Cap |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets |  | 1,008
Equity investments | Small Cap | Level 1 |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets |  | 1,008
Equity investments | Mid Cap |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | 4,953 | 12,414
Equity investments | Mid Cap | Level 1 |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | 4,953 | 12,414
Equity investments | Large Cap |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | 4,945 | 19,961
Equity investments | Large Cap | Level 1 |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | 4,945 | 19,961
Equity investments | International |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | 4,443 | 8,941
Equity investments | International | Level 1 |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | 4,443 | 8,941
Fixed Income Funds |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | 89,508 | 62,967
Fixed Income Funds | Level 1 |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets |  | 5,718
Fixed Income Funds | Level 2 |  |
Summary, by asset category, of the fair value of pension plan assets |  |
Fair value of pension plan assets | $ 89,508 | $ 57,249

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