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Segment Information (Detail) - Major customers (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Segment Reporting Information [Line Items]          
Segment Reporting, Disclosure of Major Customers     0.1    
Customer A          
Segment Reporting Information [Line Items]          
Amount (in Dollars) $ 2.4us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= cspi_CustomerAMember
$ 1.9us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= cspi_CustomerAMember
$ 4.7us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= cspi_CustomerAMember
$ 8.0us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= cspi_CustomerAMember
 
% of Total Revenues 13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= cspi_CustomerAMember
9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= cspi_CustomerAMember
12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= cspi_CustomerAMember
19.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= cspi_CustomerAMember
 
Customer B          
Segment Reporting Information [Line Items]          
Accounts Receivable, Gross 5us-gaap_AccountsReceivableGross
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
  5us-gaap_AccountsReceivableGross
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
  3us-gaap_AccountsReceivableGross
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
Amount (in Dollars) $ 3.7us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
$ 5.6us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
$ 6.6us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
$ 8.9us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
 
% of Total Revenues 20.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
17.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
 
concentration risk, percentage, accounts receivable 31.00%cspi_Concentrationriskpercentageaccountsreceivable
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
  31.00%cspi_Concentrationriskpercentageaccountsreceivable
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember
  20.00%cspi_Concentrationriskpercentageaccountsreceivable
/ us-gaap_MajorCustomersAxis
= cspi_CustomerBMember