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Goodwill and Intangible Assets, Net - Goodwill Activity (Details) (USD $)
12 Months Ended
Mar. 30, 2014
Mar. 29, 2015
Goodwill [Roll Forward]    
Balance $ 144,924,000us-gaap_Goodwill $ 135,644,000us-gaap_Goodwill
Impairment losses (2,161,000)us-gaap_GoodwillImpairmentLoss  
Dispositions (7,323,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit  
Additions 204,000us-gaap_GoodwillPeriodIncreaseDecrease  
Balance 135,644,000us-gaap_Goodwill 135,644,000us-gaap_Goodwill
Accumulated impairment loss 922,500,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss 922,500,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Communications    
Goodwill [Roll Forward]    
Balance 124,205,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
122,248,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
Impairment losses (2,161,000)us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
 
Dispositions 0us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
 
Additions 204,000us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
 
Balance 122,248,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
122,248,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= idti_CommunicationsMember
Computing and Consumer    
Goodwill [Roll Forward]    
Balance 20,719,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
13,396,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
Impairment losses 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
 
Dispositions (7,323,000)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
 
Additions 0us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
 
Balance $ 13,396,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember
$ 13,396,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= idti_ComputingAndConsumerMember