Shareholders' Equity Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 115,484	$ 112,821	$ 118,149
Average Shares Outstanding:
Weighted-average common shares outstanding for basic computation	40,892	41,942	42,060
Dilutive effect of potential common shares	295	389	482
Weighted-average common shares outstanding for dilutive computation	41,187	42,331	42,542
Net Income Per Share — Basic	$ 2.82	$ 2.69	$ 2.81
Net Income Per Share — Diluted	$ 2.80	$ 2.67	$ 2.78