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, 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
Revenue, Major Customer [Line Items]
Revenue	$ 912,931	$ 906,196	$ 931,627	$ 931,236	$ 948,873	$ 927,962	$ 973,243	$ 924,395	$ 3,681,990	$ 3,774,473	$ 3,577,780
Sales [Member]
Revenue, Major Customer [Line Items]
Revenue									3,681,990	3,774,473	3,577,780
Revenue percentage									100.00%	100.00%	100.00%
Department Of Defense [Member] | Sales [Member]
Revenue, Major Customer [Line Items]
Revenue									2,735,102	2,944,924	2,858,721
Revenue percentage									74.30%	78.00%	79.90%
Federal Civilian Agencies [member] | Sales [Member]
Revenue, Major Customer [Line Items]
Revenue									741,053	620,870	537,687
Revenue percentage									20.10%	16.50%	15.00%
Commercial And Other [Member] | Sales [Member]
Revenue, Major Customer [Line Items]
Revenue									190,142	193,840	166,966
Revenue percentage									5.20%	5.10%	4.70%
State And Local Governments [Member] | Sales [Member]
Revenue, Major Customer [Line Items]
Revenue									$ 15,693	$ 14,839	$ 14,406
Revenue percentage									0.40%	0.40%	0.40%