Earnings Per Share - Weighted Average (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Earnings Per Share [Abstract]
Net income	$ 130,393	$ 111,860	$ 379,058	$ 341,975
Weighted average number of basic shares outstanding (in shares)	22,087	22,279	22,054	22,332
Dilutive effect of equity awards (in shares)	78	104	104	153
Weighted average number of diluted shares outstanding (in shares)	22,165	22,383	22,158	22,485
Basic earnings per share (in dollars per share)	$ 5.90	$ 5.02	$ 17.19	$ 15.31
Diluted earnings per share (in dollars per share)	$ 5.88	$ 5.00	$ 17.11	$ 15.21