Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Expected tax expense computed at federal statutory rate	$ 127,122	$ 114,376	$ 101,564
State and local taxes, net of federal benefit	20,362	16,508	15,900
R&D tax credit, net	(14,073)	(12,604)	(14,205)
Stock-based compensation	(6,221)	(2,385)	(930)
Nonincludible and nondeductible items, net	3,426	4,368	1,105
Remeasurement of deferred taxes	0	(1,150)	(5,546)
Changes in unrecognized tax benefits	(23,161)	0	0
Other	(1,944)	5,612	1,016
Total income tax expense	$ 105,511	$ 124,725	$ 98,904
Effective income tax rate	17.40%	22.90%	20.40%