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Other Assets (Schedule of Other Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Mar. 31, 2012
Finite-Lived Intangible Assets [Line Items]      
Restricted assets $ 644us-gaap_OtherRestrictedAssetsNoncurrent $ 499us-gaap_OtherRestrictedAssetsNoncurrent  
Other investment 1,382us-gaap_EquityMethodInvestments 1,436us-gaap_EquityMethodInvestments 2,000us-gaap_EquityMethodInvestments
Nanya private placement shares 10,318us-gaap_RestrictedInvestments 10,645us-gaap_RestrictedInvestments  
Other 1,151us-gaap_OtherAssetsMiscellaneousNoncurrent 1,145us-gaap_OtherAssetsMiscellaneousNoncurrent  
Other assets 28,995issi_DepositsAndOtherAssetsNoncurrent 24,369issi_DepositsAndOtherAssetsNoncurrent [1]  
Technology licenses, net      
Finite-Lived Intangible Assets [Line Items]      
Technology licenses, net $ 15,500us-gaap_OtherIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IntellectualPropertyMember		 $ 10,644us-gaap_OtherIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_IntellectualPropertyMember		  
[1] Derived from audited financial statements.