Share-Based Compensation - Summary of Director Stock Units Activity (Details) - Non-employee Board of Director's Plan - $ / shares	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Number of Units
Balance at the beginning of the period (in shares)	324,555	329,746	338,553
Granted (in shares)	23,002	21,158	21,813
Distributed (in shares)	(32,779)	(32,352)	(35,489)
Dividend equivalents (in shares)	8,381	6,003	4,869
Balance at the end of the period (in shares)	323,159	324,555	329,746
Weighted Average Grant Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 35.25	$ 33.05	$ 42.47
Granted (in dollars per share)	48.72	56.00	49.14
Distributed (in dollars per share)	33.03	39.01	35.22
Dividend equivalents (in dollars per share)	0	0	0
Balance at the end of the period (in dollars per share)	$ 36.25	$ 35.25	$ 33.05