Quarterly Operating Results (Schedule Of Unaudited Quarterly Results Of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Selected Quarterly Financial Information [Abstract]
Sales Revenue, Services, Net	$ 522,983	$ 502,033	$ 499,269	$ 491,696	$ 510,595	$ 492,375	$ 487,145	$ 449,245	$ 2,015,981	$ 1,939,360	$ 1,734,442
Gross profit	162,924	164,079	171,948	172,877	182,267	169,226	162,638	146,051	671,828	660,182	526,906
Income from operations	39,259	54,229	52,784	53,580	58,782	52,171	46,664	41,881	199,852	199,498	136,123
Net income	$ 34,178	$ 37,741	$ 38,760	$ 37,142	$ 40,072	$ 34,739	$ 28,329	$ 25,954	$ 147,821	$ 129,094	$ 95,972
Diluted earnings per share	$ 0.61	$ 0.68	$ 0.70	$ 0.67	$ 0.70	$ 0.60	$ 0.49	$ 0.45	$ 2.65	$ 2.25	$ 1.61