ACQUISITIONS (Detail Textual 2) - USD ($) $ in Thousands	3 Months Ended									5 Months Ended	12 Months Ended
	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, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Business Acquisition [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
Net income	$ 51,831	$ 64,499	$ 142,795		$ 42,046	$ 44,231	$ 40,357	$ 42,420	$ 36,663		301,171	163,671	142,799
Amortization expense											$ 38,200	$ 40,700	38,000
NSS Acquisition
Business Acquisition [Line Items]
Revenue										$ 427,200
Net income										18,800
Acquisition-related expenses													$ 7,300
Integration and restructuring costs										3,900
NSS Acquisition | Customer contracts and related customer relationships
Business Acquisition [Line Items]
Amortization expense										$ 4,200

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