Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Marketable securities
Investment income, nonoperating	$ 25,600	$ 13,600	$ 400
Marketable securities, short-term portion	191,700	111,900
Marketable securities, long-term portion	$ 21,900	$ 22,800
Marketable Securities, Maturity Date, Start	1 year	1 year
Marketable Securities, Maturity Date, End	2 years	2 years
Amortized Cost	$ 213,589	$ 134,672
Allowance for Credit Losses	0	0
Net Carrying Amount	213,589	134,672
Gross Unrealized Gains (Losses)	(164)	(688)
Fair Value	213,425	133,984
Corporate Bonds
Marketable securities
Amortized Cost	45,752	52,567
Net Carrying Amount	45,752	52,567
Gross Unrealized Gains (Losses)	(95)	(460)
Fair Value	45,657	52,107
U.S. Treasury Notes
Marketable securities
Amortized Cost	46,760	46,156
Net Carrying Amount	46,760	46,156
Gross Unrealized Gains (Losses)	(71)	(228)
Fair Value	46,689	45,928
Commercial Paper
Marketable securities
Amortized Cost	121,077	35,949
Net Carrying Amount	121,077	35,949
Gross Unrealized Gains	2
Fair Value	$ 121,079	$ 35,949