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Commitments and Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Apr. 01, 2015
complaint
Loss Contingencies [Line Items]    
Amount of purchase orders that had been entered into wafer work-in-process $ 16.4us-gaap_PurchaseCommitmentRemainingMinimumAmountCommitted  
Stockholder Class Action Complaints | Pending Litigation | Subsequent Event    
Loss Contingencies [Line Items]    
Number of stockholder class action complaints   3us-gaap_LossContingencyPendingClaimsNumber
/ us-gaap_LitigationCaseAxis
= issi_StockholderClassActionComplaintsMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember