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Document And Entity Information
 3 Months Ended
Nov. 30, 2011
Jan. 02, 2012
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag true  
Amendment Description The sole purpose of this amendment to Lindsay Corporation's Quarterly Report on Form 10-Q for the quarterly period ended November 30, 2011, originally filed with the Securities and Exchange Commission on January 6, 2012, is to furnish an amended Exhibit 101 to the Form 10-Q, which contains the XBRL (eXtensible Business Reporting Language) Interactive Data File for the financial statements and notes included in Part I, Item 1 of the Form 10-Q. As permitted by Rule 405(a)(2)(ii) of Regulation S-T, Exhibit 101 was required to be furnished by amendment within 30 days of the original filing date of the Form 10-Q. Exhibit 101 of this amended Form 10-Q includes notes and schedules tagged in detail and replaces Exhibit 101 to the original Form 10-Q, which was tagged in block. No other changes have been made to the Form 10-Q. this Amendment No. 1 speaks as of the original filing date of the Form 10-Q, has not been updated to reflect events that may have occurred subsequent to the original filing date, and does not modify or update any related disclosures made in the Form 10-Q.  
Document Period End Date Nov. 30, 2011  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q1  
Trading Symbol LNN  
Entity Registrant Name LINDSAY CORP  
Entity Central Index Key 0000836157  
Current Fiscal Year End Date --08-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   12,699,038