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Document And Entity Information
 6 Months Ended
Mar. 31, 2013
May 09, 2013
Document and Entity Information [Abstract]    
Entity Registrant Name CSP INC /MA/  
Document Type 10-Q  
Current Fiscal Year End Date --09-30  
Entity Common Stock, Shares Outstanding   3,452,842
Amendment Flag false  
Entity Central Index Key 0000356037  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Smaller Reporting Company  
Entity Well-known Seasoned Issuer No  
Document Period End Date Mar. 31, 2013  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q2