CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 133	$ 19,396	$ 12,010
Other comprehensive income (loss)
Unrealized (loss) gain on available-for-sale securities	(5)	(21)	151
Tax effect on unrealized gain (loss) on available-for-sale securities	3	8	(60)
Reclassification for loss (gain) included in net income	32	4	(100)
Tax effect on realized (gain) loss on available-for-sale securities	(13)	(2)	41
Total other comprehensive income (loss)	17	(11)	32
Comprehensive income	150	19,385	12,042
Comprehensive (income) loss attributable to noncontrolling interests	(92)	19	41
Comprehensive income attributable to TRC Companies, Inc.	$ 58	$ 19,404	$ 12,083