Document And Entity Information (USD $)	12 Months Ended
	Aug. 31, 2012	Oct. 22, 2012	Feb. 29, 2012
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Aug. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Trading Symbol	lnn
Entity Registrant Name	LINDSAY CORP
Entity Current Reporting Status	Yes
Entity Central Index Key	0000836157
Current Fiscal Year End Date	--08-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		12,722,626
Entity Public Float			$ 816,560,475
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No