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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
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Sep. 30, 2014 | Sep. 30, 2013
Myricom, Inc [Member] |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Business Acquisition, Pro Forma Revenue | $ 85,237 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = cspi_MyricomIncMember | $ 97,089 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = cspi_MyricomIncMember
Business Acquisition, Pro Forma Net Income (Loss) | $ 1,052 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = cspi_MyricomIncMember | $ (518)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = cspi_MyricomIncMember
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 0.29 us-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 | $ 0.29 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = cspi_MyricomIncMember | $ (0.15)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = cspi_MyricomIncMember

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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