Benefit Plans - RSU activity (Details) - Restricted stock units - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Unrecognized Compensation Costs Not yet Recognized, Net of Estimated Forfeitures
Total unrecognized compensation cost, net of estimated forfeitures related to unvested RSUs	$ 40,367
Weighted average period to recognize unrecognized compensation cost	1 year 10 months 17 days
Excess income tax benefits
Excess income tax benefits for stock-based compensation arrangements recognized through income tax expense	$ 67,816	$ 41,195	$ 33,443
RSUs Outstanding Rollforward, Units
RSU Balance at the beginning of the year	1,813
RSUs granted	658
RSUs vested	(735)
RSUs forfeited	(110)
RSU Balance at the end of the year	1,626	1,813
RSUs expected to vest at the end of the year	1,448
RSUs Outstanding, Weighted average grant date fair value
RSU Balance at the beginning of the year	$ 53.78
RSUs granted	99.72
RSUs vested	50.25
RSUs forfeited	62.60
RSU Balance at the end of the year	73.96	$ 53.78
RSUs expected to vest at the end of the year	$ 72.15
Minimum
Equity Incentive Plans
Vesting period	3 years
Maximum
Equity Incentive Plans
Vesting period	4 years