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Acquisition Acquisition Condensed Pro Forma Combined Financial Information (Details) (Myricom, Inc [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Myricom, Inc [Member]
   
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]    
Business Acquisition, Pro Forma Revenue $ 85,237us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
$ 97,089us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Business Acquisition, Pro Forma Net Income (Loss) $ 1,052us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
$ (518)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 0.29us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
$ (0.15)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.29us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
$ (0.15)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember