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Summary of Significant Accounting Policies - Investments in Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2024
Marketable securities
Investment income, nonoperating	$ 7,700	$ 6,900	$ 23,300	$ 18,100
Marketable securities, short-term portion	195,100		195,100		$ 191,700
Marketable securities, long-term portion	31,000		$ 31,000		$ 21,900
Marketable Securities, Maturity Date, Start			1 year		1 year
Marketable Securities, Maturity Date, End			2 years		2 years
Amortized Cost	226,088		$ 226,088		$ 213,589
Allowance for Credit Losses	0		0		0
Net Carrying Amount	226,088		226,088		213,589
Gross Unrealized Losses					(164)
Gross Unrealized Gains	140		140
Fair Value	226,228		226,228		213,425
Corporate Bonds
Marketable securities
Amortized Cost	50,378		50,378		45,752
Net Carrying Amount	50,378		50,378		45,752
Gross Unrealized Losses					(95)
Gross Unrealized Gains	99		99
Fair Value	50,477		50,477		45,657
U.S. Treasury Notes
Marketable securities
Amortized Cost	46,179		46,179		46,760
Net Carrying Amount	46,179		46,179		46,760
Gross Unrealized Losses					(71)
Gross Unrealized Gains	47		47
Fair Value	46,226		46,226		46,689
Commercial Paper
Marketable securities
Amortized Cost	129,531		129,531		121,077
Net Carrying Amount	129,531		129,531		121,077
Gross Unrealized Losses	(6)		(6)
Gross Unrealized Gains					2
Fair Value	$ 129,525		$ 129,525		$ 121,079

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