Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 25, 2016	Mar. 27, 2015	Mar. 25, 2016	Mar. 27, 2015
Earnings Per Share [Abstract]
Net income applicable to TRC Companies, Inc.	$ (14,297)	$ 5,165	$ (5,868)	$ 12,652
Basic (shares)	31,045	30,382	30,886	30,233
Effect of dilutive stock options, RSA's, RSU's and PSU's (in shares)	0	355	0	318
Diluted weighted-average common shares outstanding (in shares)	31,045	30,737	30,886	30,551
Basic earnings per common share (in dollars per share)	$ (0.46)	$ 0.17	$ (0.19)	$ 0.42
Diluted earnings per common share (in dollars per share)	$ (0.46)	$ 0.17	$ (0.19)	$ 0.41
Anti-dilutive stock options, RSA's, RSU's and PSU's, excluded from the calculation (in dollars per share)	1,916	1,832	1,916	1,868