Earnings Per Share - Calculation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income	$ 499,830	$ 419,924	$ 384,735
Weighted-average number of basic shares outstanding (in shares)	22,247	22,381	23,196
Dilutive effect of RSUs after application of treasury stock method (in shares)	146	192	217
Weighted-average number of diluted shares outstanding (in shares)	22,393	22,573	23,413
Basic earnings per share (in dollars per shares)	$ 22.47	$ 18.76	$ 16.59
Diluted earnings per share (in dollars per shares)	$ 22.32	$ 18.60	$ 16.43