Severance (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Severance
Severance costs	$ 3.4	$ 3.7	$ 2.4
Executives and other employees
Severance
Costs associated with accelerated vesting of equity awards	$ 0.5	$ 0.1	$ 0.5