Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenues	$ 1,343,135	$ 1,263,089	$ 892,574
Cost of revenues	1,255,765	1,126,616	797,872
Gross profit	87,370	136,473	94,702
Selling, general and administrative expenses	78,568	77,866	57,988
Operating income	8,802	58,607	36,714
Other income (expense):
Interest expense	(1,236)	(1,436)	(800)
Interest income	468	112	32
Other	158	(472)	(30)
Income before income tax expense	8,192	56,811	35,916
Provision for federal, state and foreign income taxes	10,090	19,934	11,908
Net income (loss)	(1,898)	36,877	24,008
Less: Net income (loss) attributable to noncontrolling interest	(19,055)	1,067	0
Net income attributable to Matrix Service Company	$ 17,157	$ 35,810	$ 24,008
Basic earnings per common share (in dollars per share)	$ 0.64	$ 1.36	$ 0.92
Diluted earnings per common share (in dollars per share)	$ 0.63	$ 1.33	$ 0.91
Weighted average common shares outstanding:
Basic (in shares)	26,603	26,288	25,962
Diluted (in shares)	27,177	26,976	26,358