Document and Entity Information - shares	9 Months Ended
	Mar. 25, 2016	Apr. 26, 2016
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	Mar. 25, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		31,070,299