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Income Taxes - Components of the Temporary Differences (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | --- | ---
Deferred Tax Assets: [Abstract] |  |  |
Postretirement benefits | $ 20,775 | $ 18,862 |
Accrued liabilities | 5,042 | 4,754 |
Net operating loss carryforward | 37,768 | 32,552 |
Other | 5,950 | 6,728 |
Total deferred tax assets | 69,535 | 62,896 |
Deferred tax liabilities: [Abstract] |  |  |
Fixed assets | (15,562) | (16,156) |
Other | (3,749) | (5,536) |
Total deferred tax liabilities | (19,311) | (21,692) |
Valuation allowance | (52,019) | (1,896) | $ (1,613)
Deferred tax assets, net |  | $ 39,308 |
Deferred Tax Liabilities, Net | $ (1,795) |  |

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