Document and Entity Information	6 Months Ended
	Dec. 26, 2014	Jan. 08, 2015
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-Q
Document Period End Date	Dec. 26, 2014
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		30,352,871