CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 25, 2016	Mar. 31, 2017	Mar. 25, 2016
Income Statement [Abstract]
Gross revenue	$ 189,724	$ 158,130	$ 569,237	$ 451,332
Less subcontractor costs and other direct reimbursable charges	60,999	36,877	188,851	118,534
Net service revenue	128,725	121,253	380,386	332,798
Interest income from contractual arrangements	20	27	116	69
Insurance recoverables and other income	1,140	146	2,421	1,919
Operating costs and expenses:
Cost of services (exclusive of costs shown separately below)	107,071	104,030	316,360	280,690
General and administrative expenses	11,290	9,523	33,171	24,690
Acquisition and integration expenses	0	1,606	0	3,724
Depreciation	1,701	1,942	5,243	5,070
Goodwill impairment	0	24,465	0	24,465
Amortization	2,813	3,162	8,146	5,078
Total operating costs and expenses	122,875	144,728	362,920	343,717
Operating income (loss)	7,010	(23,302)	20,003	(8,931)
Interest income	391	189	955	326
Interest expense	(1,201)	(1,073)	(2,887)	(1,562)
Income (loss) from operations before taxes	6,200	(24,186)	18,071	(10,167)
Income tax (provision) benefit	(1,663)	9,954	(5,867)	4,358
Net income (loss)	4,537	(14,232)	12,204	(5,809)
Net income applicable to noncontrolling interest	(39)	(65)	(69)	(59)
Net income (loss) applicable to TRC Companies, Inc.	$ 4,498	$ (14,297)	$ 12,135	$ (5,868)
Basic earnings per common share (in dollars per share)	$ 0.14	$ (0.46)	$ 0.39	$ (0.19)
Diluted earnings per common share (in dollars per share)	$ 0.14	$ (0.46)	$ 0.38	$ (0.19)
Weighted-average common shares outstanding:
Basic (shares)	31,605	31,045	31,401	30,886
Diluted (shares)	32,248	31,045	31,937	30,886