Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 25, 2016	Mar. 31, 2017	Mar. 25, 2016
Earnings Per Share [Abstract]
Net income applicable to TRC Companies, Inc.	$ 4,498	$ (14,297)	$ 12,135	$ (5,868)
Basic weighted-average common shares outstanding (shares)	31,605	31,045	31,401	30,886
Effect of dilutive stock options, RSA's, RSU's and PSU's (in shares)	643	0	536	0
Diluted weighted-average common shares outstanding (in shares)	32,248	31,045	31,937	30,886
Earnings per common share applicable to TRC Companies, Inc.
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)
Anti-dilutive stock options, RSA's, RSU's and PSU's, excluded from the calculation (in dollars per share)	965	1,916	1,071	1,916