Business Segment, Customer And Geographic Information (Revenue By Customer Sector) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Revenue	$ 948,873	$ 927,962	$ 973,243	$ 924,395	$ 963,162	$ 913,369	$ 867,278	$ 833,971	$ 3,774,473	$ 3,577,780	$ 3,149,131
Revenue percentage	100.00%				100.00%				100.00%	100.00%	100.00%
Department Of Defense [Member]
Revenue									2,944,924	2,858,721	2,450,463
Revenue percentage	78.00%				79.90%				78.00%	79.90%	77.80%
Federal Civilian Agencies [member]
Revenue									620,870	537,687	535,467
Revenue percentage	16.50%				15.00%				16.50%	15.00%	17.00%
Commercial And Other [Member]
Revenue									193,840	166,966	146,839
Revenue percentage	5.10%				4.70%				5.10%	4.70%	4.70%
State And Local Governments [Member]
Revenue									$ 14,839	$ 14,406	$ 16,362
Revenue percentage	0.40%				0.40%				0.40%	0.40%	0.50%