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Acquisition Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Nov. 04, 2013
Business Combinations [Abstract]
Business Acquisition, Purchase Price Allocation, Current Assets, Inventory			$ 1,030us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment			17us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquipment
Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill			260us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Business Acquisition, Purchase Price Allocation, Assets Acquired			1,307us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Business Acquisition, Purchase Price Allocation, Liabilities Assumed			(93)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			1,214us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Payments to Acquire Businesses, Net of Cash Acquired	0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	500us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Bargain purchase gain before tax		714cspi_Bargainpurchasegainbeforetax
Deferred tax on bargain purchase gain		(252)cspi_Deferredtaxonbargainpurchasegain
Business Combination, Bargain Purchase, Gain Recognized, Amount	$ 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount	$ 462us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount

X

- Definition

In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity before tax effect.

+ References

No definition available.

+ Details

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X

- Definition

In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the deferred tax effect on the gain recognized by the entity.

+ References

No definition available.

+ Details

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X

- Definition

In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (f)(1)

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X

- Definition

Amount of assets acquired at the acquisition date.

+ References

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- Definition

Amount of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment, acquired at the acquisition date.

+ References

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X

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

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- Definition

The amount of inventory recognized as of the acquisition date.

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- Definition

Amount of liabilities assumed at the acquisition date.

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- Definition

Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

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-Publisher FASB

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-Glossary Investing Activities

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