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Employee Benefit Plans (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
Employee Benefit Plans  
Contribution to pension plan during 2021 $ 1,562
Amortization of unrecognized net actuarial loss during 2021 534
Minimum par value required for corporate bond to determine discount rate $ 250,000
Cash and cash equivalents fair value assumptions input (in dollars per share) | $ / shares $ 1