QUARTERLY FINANCIAL DATA (UNAUDITED) - Summarized Quarterly Data (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 424,200	$ 412,603	$ 424,043	$ 431,042	$ 447,707	$ 442,565	$ 450,467	$ 450,130	$ 1,691,888		$ 1,790,869		$ 1,837,287
Cost of service and product revenues, excluding depreciation and amortization	249,944	248,509	254,841	251,242	259,623	260,046	267,056	260,804	1,004,536		1,047,529
Operating income (loss)	4,712	(12,784)	(847)	7,715	10,600	5,621	(2,883)	4,276	(1,204)		17,614		3,531
Net loss	$ 1,253	$ (18,455)	$ (2,219)	$ 3,281	$ 5,562	$ (2,084)	$ (13,986)	$ (808)	$ (16,140)		$ (11,316)		$ (33,842)
Net (loss) income per share, basic and diluted (in dollars per share)	$ 0.03	$ (0.40)	$ (0.05)	$ 0.07	$ 0.12	$ (0.04)	$ (0.29)	$ (0.02)	$ (0.35)	[1]	$ (0.23)	[1]	$ (0.62)	[1]

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