Shareholders' Equity Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 143,993	$ 141,625	$ 133,910
Average Shares Outstanding:
Weighted-average common shares outstanding for basic computation	38,670	38,752	39,013
Dilutive effect of potential common shares	490	529	391
Weighted-average common shares outstanding for dilutive computation	39,160	39,281	39,404
Net Income Per Share — Basic	$ 3.72	$ 3.65	$ 3.43
Net Income Per Share — Diluted	$ 3.68	$ 3.61	$ 3.40