Shareholders' Equity Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 346,739	$ 257,414	$ 144,757
Average Shares Outstanding:
Weighted-average common shares outstanding for basic computation	38,592	38,471	38,758
Dilutive effect of potential common shares	628	634	538
Weighted-average common shares outstanding for dilutive computation	39,220	39,105	39,296
Net income per share — basic	$ 8.98	$ 6.69	$ 3.73
Net income per share — diluted	$ 8.84	$ 6.58	$ 3.68