Document and Entity Information (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Aug. 21, 2014	Dec. 27, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	TRC COMPANIES INC /DE/
Entity Central Index Key	0000103096
Current Fiscal Year End Date	--06-30
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Jun. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		30,063,601
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 115.6