Shareholders' Equity Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 133,910	$ 29,577	$ 115,484
Average Shares Outstanding:
Weighted-average common shares outstanding for basic computation	39,013	39,254	40,892
Dilutive effect of potential common shares	391	212	295
Weighted-average common shares outstanding for dilutive computation	39,404	39,466	41,187
Net Income Per Share — Basic	$ 3.43	$ 0.75	$ 2.82
Net Income Per Share — Diluted	$ 3.40	$ 0.75	$ 2.80