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Note 3 - Summary of the Difference Between Statutory Federal Income Tax Rate and Effective Rate (Details)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Statutory federal income tax rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State franchise taxes (net of federal tax benefit) (38.30%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 5.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Business meals/gifts 36.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment
Domestic production activity deduction (135.70%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (2.00%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities (2.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Dividends received deduction (424.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends (10.20%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends (4.20%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends
Penalties for uncertain and unrecognized tax benefits 115.50%djco_EffectiveIncomeTaxRateReconciliationPenaltiesPercent    
Reversal of uncertain tax position     (3.60%)djco_EffectiveIncomeTaxRateReconciliationReversalOfUncertainTaxPositionPercent
Prior year true-up 84.70%djco_EffectiveIncomeTaxRateReconciliationPriorYearTrueUpPercent    
Foreign tax credits (17.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsForeign
Effect of state rate change on beginning balance of deferred tax liabilities   (2.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate  
Other (1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (7.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate (347.50%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 17.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 29.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations