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Employee Benefits - Summary of Accrued postretirement benefit obligations recognized in Balance sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Jun. 30, 2021
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Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] |  |
Accrued postretirement benefit obligation | $ 2,620 | $ 3,065

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