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Stock-Based Employee Compensation-Text (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended
Sep. 23, 2010
Jul. 21, 2010
Mar. 29, 2015
Jun. 15, 2014
Jun. 29, 2014
Dec. 28, 2014
Jul. 12, 2013
Jun. 18, 2009
Sep. 30, 2004
Mar. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Life of options granted in the 2004 plan 7 years                  
Vesting period under original 2004 Plan 4 years                  
One quarter of the shares vest from date of grant (in years) 1 year                  
Minimum vesting period of non-performance based full value awards made under the 2004 Plan (in years) 3 years                  
Minimum vesting period performance based full value awards made under the 2004 Plan (in years) 1 year                  
ESPP                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares reserved for issuance under the amended plan (in shares)             14,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
9,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
   
Stock Options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Original number of shares of reserved for issuance (shares)                 28,500,000idti_OriginalNumberOfSharesOfReservedForIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Shares reserved for issuance under the amended plan (in shares)   36,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
               
Increase in shares available after amendment (shares)   8,300,000idti_IncreaseInSharesAvailableAfterAmendment
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
               
Original plan dilution factor to be equivalent to the amended plan (shares)   1.74idti_OriginalPlanDilutionFactorToBeEquivalentToAmendedPlan
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
               
Months Remaining for shares to vest after one year after grant (in months) 36 months                  
Minimum Exercise price of fair market value of the options under the 2004 plan on the date the option is granted (percent) 100.00%idti_MinimumExercisePriceOfFairMarketValueOfOptionsUnder2004PlanOnDateOptionIsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
                 
Percent that full value awards that result in the issuance of an aggregate of common stock available under the 2004 Plan may be granted to any one or more participants without respect to such minimum vesting provisions     5.00%idti_PercentThatFullValueAwardsThatResultInIssuanceOfAggregateOfCommonStockAvailableUnder2004PlanMayBeGrantedToAnyOneOrMoreParticipantsWithoutRespectToSuchMinimumVestingProvisions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Shares available for future grant as of balance sheet date (in shares)     11,100,000idti_SharesAvailableForFutureGrantAsOfBalanceSheetDateInShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Intrinsic value     $ 44.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Weighted average remaining contractual term     3 years 1 month 24 days              
Intrinsic value of exercisable options     30.5us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Compensation cost not yet recognized     1.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Period for recognition     1 year 0 months 10 days              
Options vested and expected to vest (shares)     3,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Weighted average exercise price (in dollars per share)     $ 7.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Weighted average remaining contractual term     3 years 9 months 4 days              
Aggregate intrinsic value     42.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
             
Restricted Stock Units (RSUs)                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Market-based stock units granted in period     2,001,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
             
Market-based stock units outstanding     3,457,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
            2,924,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Performance Shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Market-based stock units granted in period     105,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
             
Market-based stock units outstanding     517,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
            804,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Market-Based Restricted Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period under original 2004 Plan         2 years          
Compensation cost not yet recognized     5.9us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= idti_MarketBasedRestrictedStockUnitsMember
             
Period for recognition           1 year 8 months 16 days        
Market-based stock units granted in period         500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= idti_MarketBasedRestrictedStockUnitsMember
         
Fair Value Assumptions, Expected Term       1 year 9 months 18 days            
Market-based stock units outstanding     500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= idti_MarketBasedRestrictedStockUnitsMember
             
Market-based stock units vested and expected to vest     400,000idti_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestNumber
/ us-gaap_AwardTypeAxis
= idti_MarketBasedRestrictedStockUnitsMember
             
Market-based stock units, average remaining contract life (in years)           1 year 8 months 2 days        
Market-based stock units, aggregate intrinsic value     $ 8.3idti_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= idti_MarketBasedRestrictedStockUnitsMember