BUSINESS SEGMENT, CUSTOMER AND GEOGRAPHIC INFORMATION (Revenue By Customer Sector) (Details 1) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	[1]	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Revenue, Major Customer [Line Items]
Revenues	$ 1,113,900	$ 977,274		$ 830,437	$ 822,442	$ 865,506	$ 817,797	$ 815,423	$ 814,726	$ 3,744,053	$ 3,313,452	$ 3,564,562
Sales
Revenue, Major Customer [Line Items]
Revenues										$ 3,744,053	$ 3,313,452	$ 3,564,562
Revenue percentage										100.00%	100.00%	100.00%
Department of Defense | Sales
Revenue, Major Customer [Line Items]
Revenues										$ 2,439,329	$ 2,217,031	$ 2,578,024
Revenue percentage										65.10%	66.90%	72.30%
Federal civilian agencies | Sales
Revenue, Major Customer [Line Items]
Revenues										$ 1,062,508	$ 888,191	$ 771,662
Revenue percentage										28.40%	26.80%	21.70%
Commercial and other | Sales
Revenue, Major Customer [Line Items]
Revenues										$ 227,145	$ 202,858	$ 199,521
Revenue percentage										6.10%	6.10%	5.60%
State and local governments | Sales
Revenue, Major Customer [Line Items]
Revenues										$ 15,071	$ 5,372	$ 15,355
Revenue percentage										0.40%	0.20%	0.40%

[1] Acquisition of NSS on February 1, 2016.