v2.4.0.6
Document And Entity Information (USD $)
3 Months Ended
Dec. 31, 2011
Feb. 10, 2012
Apr. 02, 2011
Entity Registrant Name SEVCON, INC.    
Entity Central Index Key 0000825411    
Current Fiscal Year End Date --09-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Smaller Reporting Company    
Entity Public Float     $ 14,360,000
Entity Common Stock, Shares Outstanding   3,470,322  
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus Q1    
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Dec. 31, 2011