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Income Taxes (Detail) - Reconciliation of “expected” income tax expense (benefit) to “actual” income tax expense (benefit) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]    
Computed “expected” tax expense (in Dollars) $ 338us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 234us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Computed “expected” tax expense 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increases (reductions) in taxes resulting from:    
State income taxes, net of federal tax benefit (in Dollars) 25us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State income taxes, net of federal tax benefit 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign operations (in Dollars) 99us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 40us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Foreign operations 10.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 5.80%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Permanent differences (in Dollars) 61cspi_IncomeTaxReconciliationPermanentDifferences (22)cspi_IncomeTaxReconciliationPermanentDifferences
Permanent differences 6.10%cspi_EffectiveIncomeTaxRateReconciliationPermanentDifferences (3.20%)cspi_EffectiveIncomeTaxRateReconciliationPermanentDifferences
Stock-based compensation (in Dollars) (1)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 158us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Stock-based compensation (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 22.90%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Foreign net operating loss (in Dollars) (16)us-gaap_IncomeTaxReconciliationDeductionsOther (15)us-gaap_IncomeTaxReconciliationDeductionsOther
Foreign net operating loss (1.60%)cspi_EffectiveIncomeTaxRateReconciliationForeignNetOperatingLoss (2.20%)cspi_EffectiveIncomeTaxRateReconciliationForeignNetOperatingLoss
Uncertain tax liability adjustment (in Dollars) (336)cspi_IncomeTaxReconciliationUncertainTaxLiabilityAdjustment (61)cspi_IncomeTaxReconciliationUncertainTaxLiabilityAdjustment
Uncertain tax liability adjustment (33.90%)cspi_EffectiveIncomeTaxRateReconciliationUncertainTaxLiabilityAdjustment (8.90%)cspi_EffectiveIncomeTaxRateReconciliationUncertainTaxLiabilityAdjustment
Research & Development Credit (in Dollars) (27)us-gaap_IncomeTaxReconciliationTaxCreditsResearch (50)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Research & Development Credit (2.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (7.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Other items (in Dollars) (22)us-gaap_IncomeTaxReconciliationOtherAdjustments 36us-gaap_IncomeTaxReconciliationOtherAdjustments
Other items (2.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 5.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Income tax expense (benefit) $ 121us-gaap_IncomeTaxExpenseBenefit $ 321us-gaap_IncomeTaxExpenseBenefit
Income tax expense (benefit) 12.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 46.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations