CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 25, 2016	Mar. 31, 2017	Mar. 25, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 4,537	$ (14,232)	$ 12,204	$ (5,809)
Other comprehensive (loss) income
Unrealized (loss) gain on available-for-sale securities	(4)	5	(96)	(18)
Tax effect on unrealized (loss) gain on available-for-sale securities	2	(2)	37	8
Reclassification for loss (gain) on available-for-sale securities included in net income	0	2	0	32
Tax effect on realized (gain) loss on available-for-sale securities	0	(1)	0	(13)
Total other comprehensive (loss) income	(2)	4	(59)	9
Comprehensive income (loss)	4,535	(14,228)	12,145	(5,800)
Comprehensive income attributable to noncontrolling interests	(39)	(65)	(69)	(59)
Comprehensive income (loss) attributable to TRC Companies, Inc.	$ 4,496	$ (14,293)	$ 12,076	$ (5,859)