Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net income	$ 100,742	$ 95,417	$ 276,968	$ 273,825
Weighted-average number of basic shares outstanding during the period (in shares)	23,055	23,409	23,329	23,457
Dilutive effect of RSUs after application of treasury stock method (in shares)	222	207	217	230
Weighted-average number of diluted shares outstanding during the period (in shares)	23,277	23,616	23,546	23,687
Basic earnings per share (dollars per share)	$ 4.37	$ 4.08	$ 11.87	$ 11.67
Diluted earnings per share (dollars per share)	$ 4.33	$ 4.04	$ 11.76	$ 11.56