QUARTERLY FINANCIAL DATA (UNAUDITED) - Summarized Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 248,190	$ 258,343	$ 274,671	$ 287,835	$ 300,383	$ 305,783	$ 313,849	$ 315,464	$ 1,069,039		$ 1,235,479		$ 1,292,800
Cost of service and product revenues, excluding depreciation and amortization	133,885	142,799	151,281	153,678	157,273	169,220	174,714	169,998	581,643		671,205
Operating income (loss)	(1,835)	(22,162)	(1,551)	3,429	13,401	4,339	(38,479)	15,600	(22,119)		(5,139)		12,550
Income (loss) from continuing operations	(5,265)	(14,811)	417	(463)	5,499	3,585	42,092	8,445	(20,122)		59,621		(3,295)
Income (loss) from discontinued operations	(131)	178	6,113	(264)	(2,212)	(10,605)	(6,601)	(33,767)	5,896		(53,185)		(15,244)
Net income (loss)	$ (5,396)	$ (14,633)	$ 6,530	$ (727)	$ 3,287	$ (7,020)	$ 35,491	$ (25,322)	$ (14,226)		$ 6,436		$ (18,539)
Income (loss) from continuing operations per share, basic (in dollars per share)	$ (0.14)	$ (0.37)	$ 0.01	$ (0.01)	$ 0.12	$ 0.08	$ 0.90	$ 0.18	$ (0.48)		$ 1.28		$ (0.07)
Income (loss) from discontinued operations per share, basic (in dollars per share)	0	0	0.14	(0.01)	(0.05)	(0.23)	(0.14)	(0.72)	0.14		(1.14)		(0.33)
Net (loss) income per share, basic (in dollars per share)	(0.14)	(0.36)	0.15	(0.02)	0.07	(0.15)	0.76	(0.54)	(0.34)	[1]	0.14	[1]	(0.40)	[1]
Income (loss) from continuing operations, per share, diluted (in dollars per share)	(0.14)	(0.37)	0.01	(0.01)	0.12	0.08	0.89	0.18	(0.48)		1.27		(0.07)
Income (loss) from discontinued operations (in dollars per share)	0	0	0.14	(0.01)	(0.05)	(0.22)	(0.14)	(0.72)	0.14		(1.13)		(0.33)
Net (loss) income per share, diluted (in dollars per share)	$ (0.14)	$ (0.36)	$ 0.15	$ (0.02)	$ 0.07	$ (0.15)	$ 0.75	$ (0.54)	$ (0.34)	[1]	$ 0.14	[1]	$ (0.40)	[1]

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