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Credit Facility (Details) (Bank of America, USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended
Mar. 29, 2015
Jun. 13, 2011
Line of Credit Facility [Line Items]    
Amortization of financing costs $ 2.5us-gaap_AmortizationOfFinancingCosts  
The Subsidiary | Class A Preferred Share    
Line of Credit Facility [Line Items]    
Maximum number of shares to be sold (shares)   1,431idti_RepurchaseagreementMaximumNumberofSharestobeSold
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/ us-gaap_StatementClassOfStockAxis
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Proceeds from issuance of preferred shares   $ 135idti_RepurchaseAgreementAggregatePurchasePrice
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