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Leases - Narrative (Details)	9 Months Ended
	Jun. 30, 2020 USD ($)
Leases
One single lease component	true
Number of lease arrangements entered into but have not commenced	0
Finance Lease, Right-of-Use Asset	$ 0

X

- Definition

Indicates (true false) whether practical expedient is elected to account for lease component and nonlease component as single lease component.

+ References

No definition available.

+ Details

Name:	cspi_LeasePracticalExpedientLessorSingleLeaseComponentTrueFalse
Namespace Prefix:	cspi_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of lease arrangements entered into but not yet commenced.

+ References

No definition available.

+ Details

Name:	cspi_NumberOfLeaseArrangementsEnteredIntoButNotYetCommenced
Namespace Prefix:	cspi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of lessee's right to use underlying asset under finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

Name:	us-gaap_FinanceLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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