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Acquisition Acquisition Purchase Price Allocation (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Nov. 04, 2013
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Net of Cash Acquired $ 500us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired  
Business Combination, Bargain Purchase, Gain Recognized, Amount 462us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount  
Myricom, Inc [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory     1,030us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equipment     17us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     260us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     1,307us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     (93)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net     1,214us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Payments to Acquire Businesses, Net of Cash Acquired     500us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Bargain purchase gain before tax     714cspi_Bargainpurchasegainbeforetax
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Deferred tax on bargain purchase gain     (252)cspi_Deferredtaxonbargainpurchasegain
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
Business Combination, Bargain Purchase, Gain Recognized, Amount $ 200us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember
  $ 462us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= cspi_MyricomIncMember