Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenues	$ 1,197,509	$ 1,311,917	$ 1,343,135
Cost of revenues	1,116,506	1,185,926	1,255,765
Gross profit	81,003	125,991	87,370
Selling, general and administrative expenses	76,144	85,109	78,568
Operating income	4,859	40,882	8,802
Other income (expense):
Interest expense	(2,211)	(852)	(1,236)
Interest income	132	190	468
Other	(334)	(567)	158
Income before income tax expense	2,446	39,653	8,192
Provision for federal, state and foreign income taxes	2,308	14,116	10,090
Net income (loss)	138	25,537	(1,898)
Less: Net income (loss) attributable to noncontrolling interest	321	(3,326)	(19,055)
Net income (loss) attributable to Matrix Service Company	$ (183)	$ 28,863	$ 17,157
Basic earnings per common share (in dollars per share)	$ (0.01)	$ 1.09	$ 0.64
Diluted earnings per common share (in dollars per share)	$ (0.01)	$ 1.07	$ 0.63
Weighted average common shares outstanding:
Basic (in shares)	26,533	26,597	26,603
Diluted (in shares)	26,533	27,100	27,177