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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]    
Net sales $ 80,910us-gaap_SalesRevenueGoodsNet $ 79,123us-gaap_SalesRevenueGoodsNet
Cost of sales 51,765us-gaap_CostOfGoodsSold 53,594us-gaap_CostOfGoodsSold
Gross profit 29,145us-gaap_GrossProfit 25,529us-gaap_GrossProfit
Operating expenses:    
Research and development 12,248us-gaap_ResearchAndDevelopmentExpense 10,558us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative 12,897us-gaap_SellingGeneralAndAdministrativeExpense 11,434us-gaap_SellingGeneralAndAdministrativeExpense
Total operating expenses 25,145us-gaap_OperatingExpenses 21,992us-gaap_OperatingExpenses
Operating income 4,000us-gaap_OperatingIncomeLoss 3,537us-gaap_OperatingIncomeLoss
Interest and other income (expense), net 162us-gaap_NonoperatingIncomeExpense 431us-gaap_NonoperatingIncomeExpense
Gain on sale of investments 0us-gaap_GainLossOnSaleOfInvestments 3,121us-gaap_GainLossOnSaleOfInvestments
Income before income taxes 4,162us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 7,089us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes 926us-gaap_IncomeTaxExpenseBenefit 1,643us-gaap_IncomeTaxExpenseBenefit
Consolidated net income 3,236us-gaap_ProfitLoss 5,446us-gaap_ProfitLoss
Net income attributable to noncontrolling interests (50)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (11)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income attributable to ISSI $ 3,186us-gaap_NetIncomeLoss $ 5,435us-gaap_NetIncomeLoss
Basic net income per share (in dollars per share) $ 0.10us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic
Shares used in basic per share calculation 30,990us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 29,318us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted net income per share (in dollars per share) $ 0.10us-gaap_EarningsPerShareDiluted $ 0.18us-gaap_EarningsPerShareDiluted
Shares used in diluted per share calculation 32,521us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 30,717us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding