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Income Taxes - Components of Net Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jun. 30, 2019
--- | --- | ---
Deferred Tax Assets |  |
Net Operating Loss Carryforwards | $ 31,891 | $ 28,886
Inventory Valuation and Reserves | 8,220 | 8,230
Pension Benefits | 19,608 | 21,445
Other Postretirement Benefits | 4,110 | 4,752
Accrued Employee Benefits | 11,650 | 16,029
Deferred Tax Asset, Tax Deferred Expense, Operating lease liabilities | 11,889 |
Other Accrued Liabilities | 7,310 | 7,758
Tax Credit and Other Carryforwards | 21,048 | 4,733
Deferred Tax Assets, Goodwill and Intangible Assets | 10,531 | 0
Deferred Tax Assets, Other | 364 | 2,813
Total | 126,621 | 94,646
Valuation Allowance | (16,654) | (14,614)
Total Deferred Tax Assets | 109,967 | 80,032
Deferred Tax Liabilities |  |
Tax Depreciation in Excess of Book | 67,411 | 74,645
Deferred Tax Liabilities, Operating lease right-of-use assets | 11,715 |
Deferred Tax Liabilities, Intangible Assets | 0 | 4,259
Deferred Tax Liabilities, Other | 5,855 | 3,943
Total Deferred Tax Liabilities | 84,981 | 82,847
Total Net Deferred Tax Liabilities | $ 24,986 | $ 2,815

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