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Document And Entity Information - shares
 9 Months Ended
May 31, 2019
Jul. 09, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date May 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
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 Shell Company false  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity File Number 1-13419  
Entity Tax Identification Number 470554096  
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 Nebraska  
Entity Address, Country US  
Entity Address, Postal Zip Code 68022  
City Area Code 402  
Local Phone Number 829-6800  
Entity Common Stock, Shares Outstanding   10,786,339