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Retirement Benefits - Employee stock ownership plan (ESOP) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Retirement Benefits [Abstract]      
Shares held by ESOP (in shares) 4,497,902 5,306,643 6,134,280
Company matching contributions $ 66,249 $ 69,434 $ 72,032