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Pensions and Other Postretirement Benefits - Accumulated Benefit obligation in excess of plan assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Pensions and Other Postretirement Benefits
Projected benefit obligation	$ 4,352	$ 4,702	$ 4,581
Accumulated benefit obligation	4,352	4,702
Fair value of plan assets	$ 342	$ 560	$ 809

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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