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Document And Entity Information
 9 Months Ended
Jun. 30, 2011
Jul. 28, 2011
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   3,473,222
Amendment Flag true  
Amendment Description This Amendment No. 1 on Form 10-Q/A to our Quarterly Report on Form 10-Q for the quarter ended June 30, 2011, filed with the Securities and Exchange Commission (SEC) on August 9, 2011 is being filed to restate our consolidated financial statements and other financial information to give effect to adjustments resulting from the identification of sales that are maintenance and support services provided by third parties where the Company is not the primary obligor for the service, which requires presentation of the revenue reported by the Company net of the cost of the services as opposed to recognition as the gross sales value of the services. We have therefore reduced the product revenue and product cost of sales by the amount of the costs associated with these services. In addition, the Company identified certain other services provided pursuant to third party contracts for which the Company is the primary obligor and reported these services correctly at the gross sales value; however these services were reported as product revenue and should have been reported as service revenue. We have therefore, reclassified both the revenue and cost of sales for these services from product revenue and product cost of sales to service revenue and service cost of sales. The adjustments made to the restated financial statements referred to above did not affect gross profit, income before taxes, net income, cash flow, total assets, total liabilities, retained earnings or total shareholder equity as of or for the quarters and nine-month periods ended June 30, 2011 and 2010.We have added a disclosure in Note 2 to our Consolidated Financial Statements that explains the restatement and the impact to our Consolidated Financial Statements that were originally filed. This Form 10-Q/A (Amendment No. 1) amends and restates Part I – Items 1, 2 and 4 of the August 9, 2011 filing, in each case to reflect only the adjustments described herein and the filing of restated financial statements as discussed above, and no other information in our August 9, 2011 filing is amended hereby. Except for the foregoing amended information, this Form 10-Q/A (Amendment No. 1) filing does not reflect events occurring after August 9, 2011.  
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 Jun. 30, 2011  
Document Fiscal Year Focus 2011  
Document Fiscal Period Focus Q3