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Document And Entity Information - USD ($)
 12 Months Ended
Aug. 31, 2015
Oct. 13, 2015
Feb. 28, 2015
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Aug. 31, 2015    
Document Fiscal Year Focus 2015    
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 No    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 1,006,419,747
Entity Common Stock, Shares Outstanding   11,289,393