Document and Entity Information (USD $)	12 Months Ended
	May 31, 2013	Jul. 09, 2013	Nov. 30, 2012
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	May 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Trading Symbol	TXI
Entity Registrant Name	TEXAS INDUSTRIES INC
Entity Central Index Key	0000097472
Current Fiscal Year End Date	--05-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		28,576,319
Entity Public Float			$ 1,335,904,339