SUBSEQUENT EVENTS (Detail Textual) - USD ($) $ in Thousands				3 Months Ended									12 Months Ended
	Aug. 15, 2018	May 31, 2018	Nov. 22, 2017	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	[1]	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Subsequent Event [Line Items]
Revenue				$ 1,170,086	$ 1,124,100	$ 1,087,860		$ 1,085,814	$ 1,137,389	$ 1,086,418	$ 1,057,530	$ 1,073,280	$ 4,467,860	$ 4,354,617	$ 3,744,053
Domestic Acquisitions
Subsequent Event [Line Items]
Acquisition date		May 31, 2018	Nov. 22, 2017
Purchase consideration		$ 24,000	$ 53,000
Domestic Acquisitions | SE&A BU | Subsequent Event
Subsequent Event [Line Items]
Acquisition date	Aug. 15, 2018
Purchase consideration	$ 84,000
Revenue	$ 190,000

[1] Net income for the second quarter of FY2018 includes a net benefit related to the TCJA. See Note 19.