Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2014	Mar. 28, 2014	Dec. 27, 2013	Sep. 27, 2013	Jun. 30, 2013	Mar. 29, 2013	Dec. 28, 2012	Sep. 28, 2012	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Valuation Allowance, Deferred Tax Asset, Change in Amount					$ 25,646					$ 25,646
Income Tax Expense (Benefit)					7,660				8,742	(17,986)	(3,930)
Gross revenue	125,675	120,836	122,592	106,574	118,955	109,806	104,470	108,286	475,677	441,517	419,959
Net service revenue	94,492	88,081	91,131	81,252	86,889	83,044	75,254	75,216	354,956	320,403	301,780
Operating income (loss)	8,961	2,511	5,195	4,254	6,164	3,392	4,399	4,606	20,921	18,561	29,956
Income (loss) from operations before taxes and equity in (losses) earnings	8,944	2,489	5,157	4,162	6,097	3,314	4,319	4,494	20,752	18,224	29,288
Income (loss) from operations before equity in earnings (losses)	5,032	1,429	3,089	2,460	24,763	3,083	4,104	4,260	12,010	36,210	33,218
Net income	5,032	1,429	3,089	2,460	24,763	3,083	4,104	4,260	12,010	36,210	33,488
Net income (loss) applicable to TRC Companies, Inc.	5,037	1,431	3,096	2,487	24,779	3,101	4,123	4,272	12,051	36,275	33,575
Basic earnings (loss) per common share (in dollars per share)	$ 0.17	$ 0.05	$ 0.10	$ 0.08	$ 0.85	$ 0.11	$ 0.14	$ 0.15	$ 0.41	$ 1.26	$ 1.21
Diluted earnings (loss) per common share (in dollars per share)	$ 0.17	$ 0.05	$ 0.10	$ 0.08	$ 0.83	$ 0.10	$ 0.14	$ 0.15	$ 0.40	$ 1.23	$ 1.16
Gain (Loss) Related to Litigation Settlement									$ 0	$ 0	$ 11,061