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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
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Sep. 30, 2014 | Sep. 30, 2013
Income Tax Disclosure [Abstract] |  |
Computed “expected” tax expense (in Dollars) | $ 338 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 234 us-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) | 25 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State income taxes, net of federal tax benefit | 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign operations (in Dollars) | 99 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 40 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Foreign operations | 10.00%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential | 5.80%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Permanent differences (in Dollars) | 61 cspi_IncomeTaxReconciliationPermanentDifferences | (22)cspi_IncomeTaxReconciliationPermanentDifferences
Permanent differences | 6.10%cspi_EffectiveIncomeTaxRateReconciliationPermanentDifferences | (3.20%)cspi_EffectiveIncomeTaxRateReconciliationPermanentDifferences
Stock-based compensation (in Dollars) | (1)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 158 us-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 | 36 us-gaap_IncomeTaxReconciliationOtherAdjustments
Other items | (2.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 5.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Income tax expense (benefit) | $ 121 us-gaap_IncomeTaxExpenseBenefit | $ 321 us-gaap_IncomeTaxExpenseBenefit
Income tax expense (benefit) | 12.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 46.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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- Definition The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the foreign income tax expense or benefit, recorded during the period. + References No definition available. + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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