Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Quarterly Financial Information Disclosure [Abstract]
Sales Revenue, Services, Net	$ 359,635	$ 309,422	$ 323,529	$ 319,331	$ 364,417	$ 314,155	$ 342,880	$ 321,683	$ 1,311,917	$ 1,343,135	$ 1,263,089
Gross Profit	34,099	27,303	30,005	34,584	40,404	2,632	15,955	28,379	125,991	87,370	136,473
Operating income	14,499	6,347	4,935	15,101	18,374	(14,448)	(3,671)	8,547	40,882	8,802	58,607
Net income	$ 9,134	$ 4,357	$ 5,431	$ 9,941	$ 10,916	$ (2,959)	$ 3,286	$ 5,914	$ 28,863	$ 17,157	$ 35,810
Basic earnings per common share (in dollars per share)	$ 0.35	$ 0.16	$ 0.20	$ 0.38	$ 0.41	$ (0.11)	$ 0.12	$ 0.22	$ 1.09	$ 0.64	$ 1.36
Diluted earnings per common share (in dollars per share)	$ 0.34	$ 0.16	$ 0.20	$ 0.37	$ 0.40	$ (0.11)	$ 0.12	$ 0.22	$ 1.07	$ 0.63	$ 1.33