Annual report pursuant to Section 13 and 15(d)

Document And Entity Information

Document And Entity Information (USD $)
12 Months Ended
Sep. 30, 2014
Nov. 15, 2014
Mar. 31, 2014
Document and Entity Information [Abstract]      
Entity Registrant Name Clearfield, Inc.    
Document Type 10-K    
Current Fiscal Year End Date --09-30    
Entity Common Stock, Shares Outstanding   13,746,164  
Entity Public Float     $ 255,722,720
Amendment Flag false    
Entity Central Index Key 0000796505    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Sep. 30, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY