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Acquisition (Details) (USD $)
 12 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Nov. 04, 2013
Business Acquisition [Line Items]      
Business Combination, Bargain Purchase, Gain Recognized, Amount $ 462,000us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount $ 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount  
Payments to Acquire Businesses, Net of Cash Acquired 500,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired  
Myricom, Inc [Member]      
Business Acquisition [Line Items]      
Business Combination, Bargain Purchase, Gain Recognized, Amount 200,000us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember		   462,000us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     93,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Payments to Acquire Businesses, Net of Cash Acquired     500,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Business Acquisition pro forma Adjustments $ 300,000cspi_BusinessAcquisitionproformaAdjustments
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember