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, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Selected Quarterly Financial Information [Abstract]
Sales Revenue, Services, Net	$ 463,128	$ 454,493	$ 422,068	$ 394,753	$ 392,611	$ 355,992	$ 333,170	$ 314,735	$ 1,734,442	$ 1,396,508	$ 1,212,099
Gross profit	148,238	142,576	120,743	115,349	112,500	114,547	105,071	92,561	526,906	424,679	414,315
Income from operations	38,328	36,606	31,437	29,752	25,539	28,217	22,596	12,450	136,123	88,802	81,630
Net income	$ 30,041	$ 29,524	$ 21,343	$ 15,064	$ 17,788	$ 22,869	$ 12,940	$ 9,561	$ 95,972	$ 63,158	$ 48,786
Diluted earnings per share	$ 0.52	$ 0.50	$ 0.36	$ 0.25	$ 0.29	$ 0.38	$ 0.21	$ 0.16	$ 1.61	$ 1.05	$ 0.81