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Environmental Matters (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Jun. 30, 2020
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Environmental Remediation Obligations [Abstract] |  |
Accrual for Potential Environmental Loss Contingencies | $ 14,700 | $ 15,600
Accrued Environmental Loss Contingencies, Current | $ 2,600 | $ 6,100

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