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Stock-Based Employee Compensation-Equity Instruments Other than Options (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 0 Months Ended 1 Months Ended
Dec. 28, 2014
Jun. 15, 2014
Jun. 29, 2014
Installment
Mar. 30, 2014
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years      
Units Outstanding 3,510,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
    2,924,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Equity instruments other than options, vested and expected to vest, outstanding (shares) 2,800,000idti_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Equity instruments other than options, vested and expected to vest, weighted average remaining contractual term 1 year 5 months 2 days      
Equity instruments other than options, vested and expected to vest, aggregate intrinsic value $ 55.8idti_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Compensation cost not yet recognized 16.1us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Compensation cost not yet recognized, period for recognition 1 year 6 months 29 days      
Granted (shares) 1,911,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Units Outstanding 563,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
    804,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Equity instruments other than options, vested and expected to vest, outstanding (shares) 400,000idti_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Equity instruments other than options, vested and expected to vest, weighted average remaining contractual term 0 years 11 months 5 days      
Equity instruments other than options, vested and expected to vest, aggregate intrinsic value 8.9idti_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Compensation cost not yet recognized 1.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Compensation cost not yet recognized, period for recognition 0 years 11 months 16 days      
Granted (shares) 101,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Market-Based Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     2 years  
Units Outstanding 500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= idti_MarketBasedRestrictedStockUnitsMember
     
Equity instruments other than options, vested and expected to vest, outstanding (shares) 400,000idti_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestNumber
/ us-gaap_AwardTypeAxis
= idti_MarketBasedRestrictedStockUnitsMember
     
Equity instruments other than options, vested and expected to vest, weighted average remaining contractual term 1 year 11 months 2 days      
Equity instruments other than options, vested and expected to vest, aggregate intrinsic value 8.0idti_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsVestedandExpectedtoVestAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= idti_MarketBasedRestrictedStockUnitsMember
     
Compensation cost not yet recognized $ 6.6us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= idti_MarketBasedRestrictedStockUnitsMember
     
Compensation cost not yet recognized, period for recognition 1 year 11 months 16 days      
Granted (shares)     500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= idti_MarketBasedRestrictedStockUnitsMember
 
Share-based Compensation Arrangements by Share-based Payment Award, Number of Installments     2idti_SharebasedCompensationArrangementsbySharebasedPaymentAwardNumberofInstallments
/ us-gaap_AwardTypeAxis
= idti_MarketBasedRestrictedStockUnitsMember
 
Expected term (in years)   1 year 9 months 18 days    
Minimum | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 1 year      
Maximum | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period 3 years