CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Gross revenue	$ 620,864	$ 546,117	$ 475,677
Less subcontractor costs and other direct reimbursable charges	155,735	138,099	120,721
Net service revenue	465,129	408,018	354,956
Interest income from contractual arrangements	122	97	52
Insurance recoverables and other income	16,048	6,533	17,874
Operating costs and expenses:
Cost of services (exclusive of costs shown separately below)	402,317	337,291	312,108
General and administrative expenses	34,375	37,331	31,053
Acquisition and integration expense	6,571	0	0
Goodwill impairment	21,981	0	0
Depreciation	6,890	5,814	5,932
Amortization	7,835	3,502	2,868
Total operating costs and expenses	479,969	383,938	351,961
Operating income	1,330	30,710	20,921
Interest income	840	0	0
Interest expense	(2,707)	(134)	(169)
(Loss) income from operations before taxes	(537)	30,576	20,752
Income tax benefit (provision)	670	(11,180)	(8,742)
Net income	133	19,396	12,010
Net (income) loss applicable to noncontrolling interest	(92)	19	41
Net income applicable to TRC Companies, Inc.	$ 41	$ 19,415	$ 12,051
Earnings Per Share [Abstract]
Basic earnings (loss) per common share (in dollars per share)	$ 0.00	$ 0.64	$ 0.41
Diluted earnings (loss) per common share (in dollars per share)	$ 0.00	$ 0.63	$ 0.40
Weighted-average common shares outstanding:
Basic (shares)	30,936	30,291	29,594
Diluted (shares)	31,359	30,724	30,140