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Segment Information (Detail) - The following table presents certain operating segment information (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Sales:
Product	$ 15,653us-gaap_SalesRevenueGoodsNet	$ 14,749us-gaap_SalesRevenueGoodsNet
Service	4,777us-gaap_SalesRevenueServicesNet	6,583us-gaap_SalesRevenueServicesNet
Total sales	20,430us-gaap_SalesRevenueNet	21,332us-gaap_SalesRevenueNet
Income (loss) from operations	(921)us-gaap_OperatingIncomeLoss	340us-gaap_OperatingIncomeLoss
Assets	47,789us-gaap_Assets	48,878us-gaap_Assets	46,307us-gaap_Assets
Capital expenditures	103us-gaap_CapitalExpendituresIncurredButNotYetPaid	273us-gaap_CapitalExpendituresIncurredButNotYetPaid
Depreciation and amortization	172us-gaap_DepreciationAndAmortization	239us-gaap_DepreciationAndAmortization
High Performance Products and Solutions Segment
Sales:
Product	2,452us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember	1,006us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember
Service	230us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember	1,283us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember
Total sales	2,682us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember	2,289us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember
Income (loss) from operations	(857)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember	142us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember
Assets	15,850us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember	15,304us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember
Capital expenditures	21us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember	61us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember
Depreciation and amortization	71us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember	52us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cspi_SystemsSegmentMember
Germany
Sales:
Product	2,144us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember	1,401us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember
Service	3,528us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember	4,188us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember
Total sales	5,672us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember	5,589us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember
Income (loss) from operations	79us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember	(81)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember
Assets	12,861us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember	13,134us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember
Capital expenditures	81us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember	87us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember
Depreciation and amortization	47us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember	46us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cspi_GermanyMember
United Kingdom
Sales:
Product	1,570us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember	647us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember
Service	283us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember	328us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember
Total sales	1,853us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember	975us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember
Income (loss) from operations	68us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember	31us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember
Assets	3,770us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember	3,379us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember
Capital expenditures	1us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember	23us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember
Depreciation and amortization	7us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember	4us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cspi_UKMember
U.S.
Sales:
Product	9,487us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember	11,695us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember
Service	736us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember	784us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember
Total sales	10,223us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember	12,479us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember
Income (loss) from operations	(211)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember	248us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember
Assets	15,308us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember	17,061us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember
Capital expenditures	0us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember	102us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember
Depreciation and amortization	47us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember	137us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cspi_USMember
Total
Sales:
Product	13,201us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember	13,743us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember
Service	4,547us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember	5,300us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember
Total sales	17,748us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember	19,043us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember
Income (loss) from operations	(64)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember	198us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember
Assets	31,939us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember	33,574us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember
Capital expenditures	82us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember	212us-gaap_CapitalExpendituresIncurredButNotYetPaid / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember
Depreciation and amortization	$ 101us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember	$ 187us-gaap_DepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = cspi_TotalServiceAndSystemIntegrationSegmentMember

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