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Quarterly Financial Data (Unaudited) (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]
Sales Revenue, Services, Net	$ 291,836	$ 251,237	$ 312,655	$ 341,781	$ 359,635	$ 309,422	$ 323,529	$ 319,331	$ 1,197,509	$ 1,311,917	$ 1,343,135
Gross profit	23,127	(2,614)	28,212	32,278	34,099	27,303	30,005	34,584	81,003	125,991	87,370
Operating income	3,531	(21,210)	8,237	14,301	14,499	6,347	4,935	15,101	4,859	40,882	8,802
Net income	$ (954)	$ (13,821)	$ 5,250	$ 9,342	$ 9,134	$ 4,357	$ 5,431	$ 9,941	$ (183)	$ 28,863	$ 17,157
Basic earnings per common share (in dollars per share)	$ (0.04)	$ (0.52)	$ 0.20	$ 0.35	$ 0.35	$ 0.16	$ 0.20	$ 0.38	$ (0.01)	$ 1.09	$ 0.64
Diluted earnings per common share (in dollars per share)	$ (0.04)	$ (0.52)	$ 0.20	$ 0.35	$ 0.34	$ 0.16	$ 0.20	$ 0.37	$ (0.01)	$ 1.07	$ 0.63

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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