Quarterly Operating Results (Schedule Of Unaudited Quarterly Results Of Operations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Selected Quarterly Financial Information [Abstract]
Sales Revenue, Services, Net	$ 510,595	$ 492,375	$ 487,145	$ 449,245	$ 463,128	$ 454,493	$ 422,068	$ 394,753	$ 1,939,360	$ 1,734,442	$ 1,396,508
Gross profit	182,267	169,226	162,638	146,051	148,238	142,576	120,743	115,349	660,182	526,906	424,679
Income from operations	58,782	52,171	46,664	41,881	38,328	36,606	31,437	29,752	199,498	136,123	88,802
Net income	$ 40,072	$ 34,739	$ 28,329	$ 25,954	$ 30,041	$ 29,524	$ 21,343	$ 15,064	$ 129,094	$ 95,972	$ 63,158
Diluted earnings per share	$ 0.70	$ 0.60	$ 0.49	$ 0.45	$ 0.52	$ 0.50	$ 0.36	$ 0.25	$ 2.25	$ 1.61	$ 1.05