Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 26, 2014	Dec. 27, 2013	Dec. 26, 2014	Dec. 27, 2013
Earnings Per Share [Abstract]
Net income applicable to TRC Companies, Inc.	$ 4,002	$ 3,096	$ 7,487	$ 5,583
Basic (shares)	30,329	29,652	30,157	29,477
Effect of dilutive stock options, RSA's, RSU's and PSU's (in shares)	202	417	301	572
Diluted weighted-average common shares outstanding (in shares)	30,531	30,069	30,458	30,049
Basic earnings per common share (in dollars per share)	$ 0.13	$ 0.10	$ 0.25	$ 0.19
Diluted earnings per common share (in dollars per share)	$ 0.13	$ 0.10	$ 0.25	$ 0.19
Anti-dilutive stock options, RSA's, RSU's and PSU's, excluded from the calculation (in dollars per share)	2,098	2,227	2,000	2,071