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Pension and Retirement Plans (Detail)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]
Number of years defined benefit plans are closed to newly hired employees	2 years	2 years	2 years

X

- Definition

Number of years that all of the Company's defined benefit plans are closed to newly hired employees.

+ References

No definition available.

+ Details

Name:	cspi_NumberOfYearsDefinedBenefitPlansAreClosedToNewlyHiredEmployees
Namespace Prefix:	cspi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration