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Investments - Available-For-Sale Debt Securities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 29, 2015
Mar. 30, 2014
Amortized Cost    
Due in 1 year or less $ 153,753us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost $ 173,850us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
Due in 1-2 years 132,241idti_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsAmortizedCost 101,275idti_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsAmortizedCost
Due in 2-5 years 211,329idti_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoThroughFiveYearsAmortizedCost 149,550idti_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoThroughFiveYearsAmortizedCost
Total investments in available-for-sale debt securities 497,323us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis 424,675us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Estimated Fair Value    
Due in 1 year or less 153,823us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue 173,891us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Due in 1-2 years 132,529idti_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsFairValue 101,378idti_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsFairValue
Due in 2-5 years 211,831idti_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoThroughFiveYearsFairValue 149,606idti_AvailableForSaleSecuritiesDebtMaturitiesAfterTwoThroughFiveYearsFairValue
Total investments in available-for-sale debt securities $ 498,183us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent $ 424,875us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent