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Concentrations (Narrative) (Details) (Sales Revenue, Goods, Net)
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Largest Distributor    
Concentration Risk [Line Items]    
Concentration risk, largest customers 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= issi_LargestDistributorMember
15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= issi_LargestDistributorMember
Second Largest Distributor    
Concentration Risk [Line Items]    
Concentration risk, largest customers 14.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= issi_SecondLargestDistributorMember
13.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember
/ us-gaap_MajorCustomersAxis
= issi_SecondLargestDistributorMember