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Note 6 - Intangible Assets (Details Textual) (USD $)	3 Months Ended		9 Months Ended		7 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2013
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			5 years
Amortization of Intangible Assets	$ 1,223,000us-gaap_AmortizationOfIntangibleAssets	$ 476,000us-gaap_AmortizationOfIntangibleAssets	$ 3,642,000us-gaap_AmortizationOfIntangibleAssets	$ 1,111,000us-gaap_AmortizationOfIntangibleAssets
Tax Purposes [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			15 years
ISD Corporation [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite-Lived Intangible Assets, Net	12,479,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = djco_ISDMember		12,479,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = djco_ISDMember
Finite-Lived Intangible Assets, Accumulated Amortization	2,496,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = djco_ISDMember		2,496,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = djco_ISDMember
Amortization of Intangible Assets			2,217,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = djco_ISDMember
New Dawn [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Finite-Lived Intangible Assets, Net	6,488,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember		6,488,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember
Finite-Lived Intangible Assets, Accumulated Amortization	3,012,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember		3,012,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember
Amortization of Intangible Assets		$ 476,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember	$ 1,425,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember		$ 1,111,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = djco_NewDawnMember

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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X

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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