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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) | $ 2.4 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cspi_CustomerAMember | $ 1.9 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cspi_CustomerAMember | $ 4.7 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cspi_CustomerAMember | $ 8.0 us-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 | 5 us-gaap_AccountsReceivableGross / us-gaap_MajorCustomersAxis = cspi_CustomerBMember |  | 5 us-gaap_AccountsReceivableGross / us-gaap_MajorCustomersAxis = cspi_CustomerBMember |  | 3 us-gaap_AccountsReceivableGross / us-gaap_MajorCustomersAxis = cspi_CustomerBMember
Amount (in Dollars) | $ 3.7 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cspi_CustomerBMember | $ 5.6 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cspi_CustomerBMember | $ 6.6 us-gaap_Revenues / us-gaap_MajorCustomersAxis = cspi_CustomerBMember | $ 8.9 us-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

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the balance. + References No definition available. + Details
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- Definition For unclassified balance sheet, amounts due from customers or clients for goods or services that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.9) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition Disclosure of the extent of enterprise reliance on its major customers. For example, includes revenues from transactions with a single external customer amounting to 10 percent or more of the entity's revenues, the total amount of revenues from each such customer, and the identity of the segment or segments reporting the revenues. A group of entities that the entity knows to be under common control generally will be considered a single customer for inclusion in this item. The federal government, a state government, a local government (for example, a county or municipality), or a foreign government each will generally be considered as a single customer for inclusion in this item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 + Details
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