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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 | $ 250,000 us-gaap_ValuationAllowancesAndReservesBalance | $ 250,000 us-gaap_ValuationAllowancesAndReservesBalance | $ 200,000 us-gaap_ValuationAllowancesAndReservesBalance | $ 250,000 us-gaap_ValuationAllowancesAndReservesBalance
Allowance for doubtful accounts | 41,000 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 144,000 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense | 49,000 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |
Allowance for doubtful accounts | $ (41,000)djco_ValuationAllowancesAndReservesAmountsChargedOffLessRecoveries | $ (94,000)djco_ValuationAllowancesAndReservesAmountsChargedOffLessRecoveries | $ (99,000)djco_ValuationAllowancesAndReservesAmountsChargedOffLessRecoveries |

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- Definition Information pertaining to valuation allowances and reserves amounts charged off less recoveries. + References No definition available. + Details
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Namespace Prefix: | djco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- 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