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BUSINESS SEGMENT, CUSTOMER AND GEOGRAPHIC INFORMATION - Revenue by Customer Sector (Detail 1) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Revenue, Major Customer [Line Items]
Revenue	$ 1,137,389	$ 1,086,418	$ 1,057,530	$ 1,073,280	$ 1,113,900	$ 977,274	$ 830,437	$ 822,442	$ 4,354,617	$ 3,744,053	$ 3,313,452
Customer Information | Sales
Revenue, Major Customer [Line Items]
Revenue									$ 4,354,617	$ 3,744,053	$ 3,313,452
Percentage of revenue									100.00%	100.00%	100.00%
Customer Information | Department of Defense | Sales
Revenue, Major Customer [Line Items]
Revenue									$ 2,829,305	$ 2,439,329	$ 2,217,031
Percentage of revenue									65.00%	65.10%	66.90%
Customer Information | Federal civilian agencies | Sales
Revenue, Major Customer [Line Items]
Revenue									$ 1,259,212	$ 1,062,508	$ 888,191
Percentage of revenue									28.90%	28.40%	26.80%
Customer Information | Commercial and other | Sales
Revenue, Major Customer [Line Items]
Revenue									$ 266,100	$ 242,216	$ 208,230
Percentage of revenue									6.10%	6.50%	6.30%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Topic 825
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-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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