CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Gross revenue	$ 475,677	$ 441,517	$ 419,959
Less subcontractor costs and other direct reimbursable charges	120,721	121,114	118,179
Net service revenue	354,956	320,403	301,780
Interest income from contractual arrangements	52	239	295
Insurance recoverables and other income	17,874	4,514	614
Operating costs and expenses:
Cost of services (exclusive of costs shown separately below)	312,108	268,545	246,506
General and administrative expenses	31,053	30,739	31,025
Provision for doubtful accounts	0	408	755
Depreciation and amortization	8,800	6,903	5,508
Arena Towers litigation reversal	0	0	(11,061)
Total operating costs and expenses	351,961	306,595	272,733
Operating income	20,921	18,561	29,956
Interest expense	(169)	(337)	(668)
Income from operations before taxes and equity in earnings	20,752	18,224	29,288
Federal and state income tax (provision) benefit	(8,742)	17,986	3,930
Income from operations before equity in earnings	12,010	36,210	33,218
Equity in earnings from unconsolidated affiliates, net of taxes	0	0	270
Net income	12,010	36,210	33,488
Net loss applicable to noncontrolling interest	41	65	87
Net income applicable to TRC Companies, Inc.	$ 12,051	$ 36,275	$ 33,575
Earnings Per Share [Abstract]
Basic earnings (loss) per common share (in dollars per share)	$ 0.41	$ 1.26	$ 1.21
Diluted earnings (loss) per common share (in dollars per share)	$ 0.40	$ 1.23	$ 1.16
Weighted-average common shares outstanding:
Basic (shares)	29,594	28,843	27,781
Diluted (shares)	30,140	29,601	28,822