401(K) Profit Sharing Plan - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Profit sharing plan
Contributions expensed	$ 1.4	$ 1.4	$ 1.3
Full-time Employees
Profit sharing plan
Eligible service period (in months)	1 month
Part-time Employees
Profit sharing plan
Eligible service period (in months)	12 months
Eligible minimum service period (in hours)	1000 hours
Minimum
Profit sharing plan
Employee's contribution (as a percent)	1.00%
Maximum
Profit sharing plan
Employee's contribution (as a percent)	75.00%
Match contribution by employer (as a percent)	4.00%