Stock Incentive Plans - Summary of the status and shares subject to stock appreciation rights awards and average price per share (Details) - Stock Appreciation Rights (SARs) - $ / shares	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Number of Shares
Beginning balance, nonvested (in shares)	1,661,198
Granted (in shares)	815,035
Vested (in shares)	(899,126)
Canceled (in shares)	(37,605)
Ending balance, nonvested (in shares)	1,539,502	1,661,198
Weighted-Average Grant Date Fair Value
Beginning balance, nonvested (in USD per share)	$ 31.58
Granted (in USD per share)	31.68	$ 35.09	$ 29.71
Vested (in USD per share)	30.26
Canceled (in USD per share)	31.46
Ending balance, nonvested (in USD per share)	$ 32.41	$ 31.58