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Earnings Per Share of Common Stock (Detail) - Basic and diluted earnings per share computations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]    
Net income (loss) $ (437)us-gaap_NetIncomeLoss $ 346us-gaap_NetIncomeLoss
Less: Net income attributable to nonvested common stock (in Dollars) (16)cspi_NetIncomeLossAttributableToNonvestedCommonStock 11cspi_NetIncomeLossAttributableToNonvestedCommonStock
Net income attributable to common stockholders (in Dollars) $ (421)cspi_NetIncomeAttributableToCommonShareholders $ 335cspi_NetIncomeAttributableToCommonShareholders
Weighted average total shares outstanding – basic 3,625cspi_WeightedAverageTotalSharesOutstandingBasic 3,545cspi_WeightedAverageTotalSharesOutstandingBasic
Less: weighted average non-vested shares outstanding 135us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights 114us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights
Weighted average number of common shares outstanding – basic 3,490us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 3,431us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Potential common shares from non-vested stock awards and the assumed exercise of stock options 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 43us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average common shares outstanding – diluted 3,490us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 3,474us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per share – basic (in Dollars per share) $ (0.12)us-gaap_EarningsPerShareBasic $ 0.10us-gaap_EarningsPerShareBasic
Net income (loss) per share – diluted (in Dollars per share) $ (0.12)us-gaap_EarningsPerShareDiluted $ 0.10us-gaap_EarningsPerShareDiluted