Document And Entity Information - USD ($)	12 Months Ended
	Aug. 31, 2017	Oct. 09, 2017	Feb. 28, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Aug. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	lnn
Entity Registrant Name	LINDSAY CORP
Entity Central Index Key	0000836157
Current Fiscal Year End Date	--08-31
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 825,259,673
Entity Common Stock, Shares Outstanding		10,697,035