Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Marketable securities
Investment income, nonoperating	$ 13,600	$ 400	$ 0
Marketable securities, short-term portion	111,900	63,000
Marketable securities, long-term portion	$ 22,800	$ 21,700
Marketable Securities, Maturity Date, Start	1 year	1 year
Marketable Securities, Maturity Date, End	2 years	2 years
Amortized Cost	$ 134,672	$ 84,652
Allowance for Credit Losses	0	0
Net Carrying Amount	134,672	84,652
Gross Unrealize (Losses)	(688)	(890)
Fair Value	133,984	83,762
Corporate Bonds
Marketable securities
Amortized Cost	52,567	50,067
Net Carrying Amount	52,567	50,067
Gross Unrealize (Losses)	(460)	(691)
Fair Value	52,107	49,376
U.S. Treasury Notes
Marketable securities
Amortized Cost	46,156	16,399
Net Carrying Amount	46,156	16,399
Gross Unrealize (Losses)	(228)	(199)
Fair Value	45,928	16,200
Commercial Paper
Marketable securities
Amortized Cost	35,949	18,186
Net Carrying Amount	35,949	18,186
Fair Value	$ 35,949	$ 18,186