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Segment Information - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 29, 2015
Dec. 28, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Dec. 29, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]                      
Revenues by segment $ 158,350us-gaap_SalesRevenueNet $ 151,160us-gaap_SalesRevenueNet $ 137,093us-gaap_SalesRevenueNet $ 126,302us-gaap_SalesRevenueNet $ 118,640us-gaap_SalesRevenueNet $ 124,628us-gaap_SalesRevenueNet $ 124,047us-gaap_SalesRevenueNet $ 117,464us-gaap_SalesRevenueNet $ 572,905us-gaap_SalesRevenueNet $ 484,779us-gaap_SalesRevenueNet $ 484,452us-gaap_SalesRevenueNet
Income from continuing operations, before income taxes                 115,938us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 112,294us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 591us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Amortization of intangible assets                 (6,573)us-gaap_AmortizationOfIntangibleAssets (24,793)us-gaap_AmortizationOfIntangibleAssets (20,546)us-gaap_AmortizationOfIntangibleAssets
Impairment of acquired in-process R&D                 (5,600)us-gaap_GoodwillAndIntangibleAssetImpairment    
Stock-based compensation                 (22,259)us-gaap_AllocatedShareBasedCompensationExpense (13,352)us-gaap_AllocatedShareBasedCompensationExpense (13,272)us-gaap_AllocatedShareBasedCompensationExpense
Other-than-temporary loss on investments                 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet (1,708)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
Interest income and other, net                 4,791us-gaap_OtherNonoperatingIncomeExpense 2,707us-gaap_OtherNonoperatingIncomeExpense 1,708us-gaap_OtherNonoperatingIncomeExpense
Communications                      
Segment Reporting Information [Line Items]                      
Revenues by segment                 313,630us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
292,435us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
258,184us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
Income from continuing operations, before income taxes                 116,018us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
103,457us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
78,995us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
Computing and Consumer                      
Segment Reporting Information [Line Items]                      
Revenues by segment                 259,275us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
192,344us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
226,268us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
Income from continuing operations, before income taxes                 29,301us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
(22,658)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
(30,972)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
Unallocated expenses                      
Segment Reporting Information [Line Items]                      
Amortization of intangible assets                 (6,573)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(21,964)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(16,339)us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Inventory fair market value adjustment                 0idti_FairMarketValueAdjustmentToAcquiredInventorySold
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
0idti_FairMarketValueAdjustmentToAcquiredInventorySold
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(358)idti_FairMarketValueAdjustmentToAcquiredInventorySold
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Impairment of acquired in-process R&D                 0us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(2,433)us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
0us-gaap_GoodwillAndIntangibleAssetImpairment
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Gain on divestiture                 0us-gaap_GainLossOnDispositionOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
78,632us-gaap_GainLossOnDispositionOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
7,986us-gaap_GainLossOnDispositionOfAssets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Asset impairment and other                 (2,968)us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(4,113)us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(6,096)us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Stock-based compensation                 (22,453)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(12,677)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(13,054)us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Severance, retention and facility closure costs                 (1,250)us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(6,590)us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(5,584)us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Acquisition-related income (costs) and other                 125us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(802)us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(11,238)us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Consulting expenses related to stockholder activities                 0idti_ExpensesRelatedToStockholderActivities
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
0idti_ExpensesRelatedToStockholderActivities
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(1,614)idti_ExpensesRelatedToStockholderActivities
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Deferred compensation plan expense (benefit)                 (50)us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
51us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(194)us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Life insurance proceeds received                 0us-gaap_ProceedsFromLifeInsurancePolicies
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
0us-gaap_ProceedsFromLifeInsurancePolicies
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
2,313us-gaap_ProceedsFromLifeInsurancePolicies
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Other-than-temporary loss on investments                 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
(1,708)us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Interest income and other, net                 $ 3,788us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
$ 1,391us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
$ (1,546)us-gaap_OtherNonoperatingIncomeExpense
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember
Customer Concentration Risk | Accounts Receivable                      
Segment Reporting Information [Line Items]                      
Number of significant distributors (distributors)                 2idti_ConcentrationRiskNumberOfSignificantCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
2idti_ConcentrationRiskNumberOfSignificantCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
 
Maxtek | Customer Concentration Risk | Sales                      
Segment Reporting Information [Line Items]                      
Concentration risk (percentage)                     13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_MaxtekMember
Avnet | Customer Concentration Risk | Sales                      
Segment Reporting Information [Line Items]                      
Concentration risk (percentage)                 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_AvnetMember
12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_AvnetMember
10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_AvnetMember
Uniquest | Customer Concentration Risk | Sales                      
Segment Reporting Information [Line Items]                      
Concentration risk (percentage)                 16.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_UniquestMember
  10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_UniquestMember
Significant Distributor 1 | Customer Concentration Risk | Accounts Receivable                      
Segment Reporting Information [Line Items]                      
Customer concentration risk (percent) 11.00%idti_CustomerConcentrationRiskPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_SignificantDistributor1Member
      15.00%idti_CustomerConcentrationRiskPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_SignificantDistributor1Member
      11.00%idti_CustomerConcentrationRiskPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_SignificantDistributor1Member
15.00%idti_CustomerConcentrationRiskPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_SignificantDistributor1Member
 
Significant Distributor 2 | Customer Concentration Risk | Accounts Receivable                      
Segment Reporting Information [Line Items]                      
Customer concentration risk (percent) 10.00%idti_CustomerConcentrationRiskPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_SignificantDistributor2Member
      14.00%idti_CustomerConcentrationRiskPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_SignificantDistributor2Member
      10.00%idti_CustomerConcentrationRiskPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_SignificantDistributor2Member
14.00%idti_CustomerConcentrationRiskPercentage
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= idti_SignificantDistributor2Member