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Stock-Based Compensation - Stock Options (Details) - $ / shares
 9 Months Ended
Mar. 31, 2020
Shares  
Total outstanding options at beginning of year (in shares) 185,473
Options granted (in shares) 0
Options exercised (in shares) (12,125)
Outstanding options at end of period (in shares) 173,348
Weighted Average Exercise Price/Share  
Total outstanding options at beginning of year (in dollars per share) $ 32.51
Options granted (in dollars per share) 0
Options exercised (in dollars per share) 31.08
Total outstanding options at end of year (in dollars per share) $ 32.61
Exercisable at end of period (in shares) 48,869
Exercisable at end of period (in dollars per share) $ 31.71