QUARTERLY FINANCIAL DATA (UNAUDITED) - Summarized Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 294,885	$ 300,801	$ 308,515	$ 309,873	$ 320,902	$ 313,478	$ 315,249	$ 318,831	$ 1,214,074		$ 1,268,460		$ 1,291,933
Cost of service and product revenues, excluding depreciation and amortization	157,273	169,220	174,714	169,998	185,295	183,997	185,777	181,612	671,205		736,681
Operating income (loss)	14,988	5,884	(37,334)	16,736	7,577	(6,214)	2,402	10,316	274		14,081		23,764
Income (loss) from continuing operations	6,973	4,799	39,321	10,793	4,222	(11,840)	982	5,740	61,886		(896)		(5,587)
(Loss) income from discontinued operations, net of income taxes	(2,211)	(10,605)	(6,601)	(33,768)	(2,969)	(6,615)	(3,201)	(2,459)	(53,185)		(15,244)		(5,729)
Net income (loss)	$ 4,762	$ (5,806)	$ 32,720	$ (22,975)	$ 1,253	$ (18,455)	$ (2,219)	$ 3,281	$ 8,701		$ (16,140)		$ (11,316)
Income (loss) from continuing operations (in dollars per share)	$ 0.15	$ 0.10	$ 0.84	$ 0.23					$ 1.33		$ (0.02)		$ (0.12)
Loss from discontinued operations (in dollars per share)	(0.05)	(0.23)	(0.14)	(0.72)					(1.14)		(0.33)		(0.12)
Net income (loss) per share, basic (in dollars per share)	0.10	(0.12)	0.70	(0.49)					0.19	[1]	(0.35)	[1]	(0.23)	[1]
Income (loss) from continuing operations (in dollars per share)	0.15	0.10	0.83	0.23					1.32		(0.02)		(0.12)
Loss from discontinued operations (in dollars per share)	(0.05)	(0.22)	(0.14)	(0.72)					(1.13)		(0.33)		(0.12)
Net income (loss) per share, diluted (in dollars per share)	$ 0.10	$ (0.12)	$ 0.69	$ (0.49)					$ 0.18	[1]	(0.35)	[1]	$ (0.23)	[1]
Loss from continuing operations per share, basic and diluted (in dollars per share)					$ 0.09	$ (0.26)	$ 0.02	$ 0.12			(0.02)
Loss from discontinued operations per share, basic and diluted (in dollars per share)					(0.06)	(0.14)	(0.07)	(0.05)			(0.33)
Net (loss) income per share, basic and diluted (in dollars per share)					$ 0.03	$ (0.40)	$ (0.05)	$ 0.07			$ (0.35)

[1] Total is a recalculation; line items calculated individually may not sum to total due to rounding.