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Note 2 - Allowance for Doubtful Accounts (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Allowance for doubtful accounts	$ 250,000us-gaap_ValuationAllowancesAndReservesBalance	$ 250,000us-gaap_ValuationAllowancesAndReservesBalance	$ 200,000us-gaap_ValuationAllowancesAndReservesBalance	$ 250,000us-gaap_ValuationAllowancesAndReservesBalance
Allowance for doubtful accounts	41,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense	144,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense	49,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Allowance for doubtful accounts	$ (41,000)djco_ValuationAllowancesAndReservesAmountsChargedOffLessRecoveries	$ (94,000)djco_ValuationAllowancesAndReservesAmountsChargedOffLessRecoveries	$ (99,000)djco_ValuationAllowancesAndReservesAmountsChargedOffLessRecoveries

X

- Definition

Information pertaining to valuation allowances and reserves amounts charged off less recoveries.

+ References

No definition available.

+ Details

Name:	djco_ValuationAllowancesAndReservesAmountsChargedOffLessRecoveries
Namespace Prefix:	djco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

+ Details

Name:	us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration