Document and Entity Information - USD ($)	12 Months Ended
	Aug. 31, 2019	Oct. 24, 2019	Feb. 28, 2019
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Aug. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Trading Symbol	LNN
Entity Registrant Name	LINDSAY CORP
Entity Central Index Key	0000836157
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--08-31
Entity Filer Category	Large Accelerated Filer
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Interactive Data Current	Yes
Entity File Number	1-13419
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-0554096
Entity Address, Address Line One	18135 Burke Street
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Omaha
Entity Address, State or Province	NE
Entity Address, Postal Zip Code	68022
City Area Code	402
Local Phone Number	829-6800
Document Annual Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock, $1.00 par value
Security Exchange Name	NYSE
Entity Public Float			$ 936,720,708
Entity Common Stock, Shares Outstanding		10,786,339