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, 2024	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 419,924	$ 384,735	$ 366,794
Weighted-average number of basic shares outstanding during the period (in shares)	22,381	23,196	23,446
Dilutive effect of RSUs after application of treasury stock method (in shares)	192	217	231
Weighted-average number of diluted shares outstanding during the period (in shares)	22,573	23,413	23,677
Basic earnings per share (in dollars per shares)	$ 18.76	$ 16.59	$ 15.64
Diluted earnings per share (in dollars per shares)	$ 18.60	$ 16.43	$ 15.49