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Discontinued Operations (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended
May 30, 2014
Dec. 28, 2014
Jun. 29, 2014
Dec. 29, 2013
Dec. 28, 2014
Dec. 29, 2013
May 30, 2014
Mar. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestitures         $ 15,300,000us-gaap_ProceedsFromDivestitureOfBusinesses $ 96,299,000us-gaap_ProceedsFromDivestitureOfBusinesses    
Disposal Group, Including Discontinued Operation, Holding Period for Escrow Deposit 18 months              
High-Speed Converter Business                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestitures 18,000,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
  18,000,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
         
Cash held in escrow related to discontinued operations 2,700,000idti_CashHeldinEscrowRelatedtoDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
          2,700,000idti_CashHeldinEscrowRelatedtoDiscontinuedOperations
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
 
Gain on divestiture   0us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
16,840,000us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
0us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
16,840,000us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
0us-gaap_GainLossOnSaleOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
   
Long-lived assets held for sale 8,500,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
          8,500,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
 
Fixed assets held for sale 2,900,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
0us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
    0us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
  2,900,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
2,900,000us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
Intangible assets held for sale 5,600,000us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
          5,600,000us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
6,600,000us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssetsNoncurrent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember
Impairment charge     $ 8,500,000idti_DisposalGroupIncludingDiscontinuedOperationGoodwillandLonglivedAssetsImpairment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= idti_HighSpeedConverterBusinessMember