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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Income Tax Disclosure [Abstract]      
U.S. statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Net changes in deferred tax valuation allowances (4.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (19.50%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (9.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Tax on foreign earnings different than U.S. rate (11.80%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (11.70%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (9.90%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Nondeductible penalties 0.00%tecd_EffectiveIncomeTaxRateReconciliationNondeductibleExpensePenaltiesPercent 0.00%tecd_EffectiveIncomeTaxRateReconciliationNondeductibleExpensePenaltiesPercent 0.50%tecd_EffectiveIncomeTaxRateReconciliationNondeductibleExpensePenaltiesPercent
Nondeductible interest 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther 6.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
Reserve established for foreign income tax contingencies 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingenciesForeign
Effect of company-owned life insurance (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings
Other, net 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate 26.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 11.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 20.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations