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Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Stockholders' Equity Note [Abstract]    
Accumulated foreign currency translation adjustments $ (3,904)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ 1,051us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Accumulated net retirement plan transition asset (net of tax of $124 and $124, respectively) (21)issi_AccumulatedOtherComprehensiveIncomeLossNetTransitionAssetObligation 8issi_AccumulatedOtherComprehensiveIncomeLossNetTransitionAssetObligation
Accumulated net retirement plan actuarial losses (net of tax of $477 and $477, respectively) (2,045)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (2,103)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Total accumulated other comprehensive loss (5,970)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (1,044)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax [1]
Accumulated net retirement plan transition asset, tax 124issi_AccumulatedOtherComprehensiveIncomeLossNetTransitionAssetObligationTax 124issi_AccumulatedOtherComprehensiveIncomeLossNetTransitionAssetObligationTax
Accumulated net retirement plan actuarial losses, tax $ 477issi_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax $ 477issi_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTax
[1] Derived from audited financial statements.