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Income Taxes - Effective Tax Rate Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Reconciliation between statutory and effective tax rate      
Statutory U.S. income tax rate (percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Provision (benefit) from continuing operations at 35% U.S. statutory rate $ 40,579us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 39,303us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 207us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State tax, net of federal benefit 160us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 32us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (123)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Effect of foreign operations (35,740)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (33,217)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (4,890)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Repatriation of foreign earnings 0us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings 5,623us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings 1,505us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
Net operating losses and tax credits (benefited) not benefited (1,067)idti_NetOperatingLossesAndTaxCreditsNotBenefitedBenefited (10,985)idti_NetOperatingLossesAndTaxCreditsNotBenefitedBenefited (3,733)idti_NetOperatingLossesAndTaxCreditsNotBenefitedBenefited
Stock-based compensation (2,740)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost (689)us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 2,640us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Other 165us-gaap_IncomeTaxReconciliationOtherAdjustments 914us-gaap_IncomeTaxReconciliationOtherAdjustments 2,274us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense (benefit) from continuing operations $ 1,357us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation $ 981us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation $ (2,120)us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation