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Document And Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2016
Nov. 30, 2016
Mar. 31, 2016
Document Information [Line Items]      
Entity Registrant Name LRAD Corp    
Entity Central Index Key 0000924383    
Trading Symbol lrad    
Current Fiscal Year End Date --09-30    
Entity Filer Category Smaller Reporting Company    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Common Stock, Shares Outstanding (in shares)   31,800,103  
Entity Public Float     $ 45,092,119
Document Type 10-K    
Document Period End Date Sep. 30, 2016    
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY    
Amendment Flag false