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Income Taxes - Components of Income (Loss) Before Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Mar. 31, 2013
Components of Income Tax Expense (Benefit) [Line Items]      
Income (Loss) before income taxes $ 115,938idti_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxes $ 112,294idti_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxes $ 591idti_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxes
Current:      
Total current 1,359idti_CurrentIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations 784idti_CurrentIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations 1,447idti_CurrentIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
Deferred:      
Total Deferred (2)idti_DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations 197idti_DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations (3,567)idti_DeferredIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
Income tax expense (benefit) from continuing operations 1,357us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation 981us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation (2,120)us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation
United States      
Components of Income Tax Expense (Benefit) [Line Items]      
Income (Loss) before income taxes 6,113idti_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
8,634idti_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
(18,083)idti_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
Current:      
United States 0idti_CurrentFederalTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
(118)idti_CurrentFederalTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
(49)idti_CurrentFederalTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
Deferred:      
United States 79idti_DeferredFederalIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
240idti_DeferredFederalIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
(3,222)idti_DeferredFederalIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
Foreign      
Components of Income Tax Expense (Benefit) [Line Items]      
Income (Loss) before income taxes 109,825idti_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
103,660idti_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
18,674idti_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxes
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
Current:      
Foreign 1,312idti_CurrentForeignTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
867idti_CurrentForeignTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
1,368idti_CurrentForeignTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
Deferred:      
Foreign (83)idti_DeferredForeignIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
(57)idti_DeferredForeignIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
0idti_DeferredForeignIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
State      
Current:      
State 47idti_CurrentStateAndLocalTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
35idti_CurrentStateAndLocalTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
128idti_CurrentStateAndLocalTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
Deferred:      
State $ 2idti_DeferredStateAndLocalIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
$ 14idti_DeferredStateAndLocalIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
$ (345)idti_DeferredStateAndLocalIncomeTaxExpenseBenefitContinuingAndDiscontinuedOperations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember