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Summary of Significant Accounting Policies (Details 3) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2015 item | Sep. 30, 2014 | Mar. 31, 2015 customer | Mar. 31, 2014 customer | Mar. 31, 2014 customer
Concentration of Credit Risk |  |  |  |  |
Number of banks for maintenance of cash balances | 2 issc_NumberOfBanks |  | 2 issc_NumberOfBanks |  |
Allowance for doubtful accounts | $ 3.6 issc_ProvisionForLossOnUnbilledReceivables | $ 3.7 issc_ProvisionForLossOnUnbilledReceivables |  |  |
Revenues Net | Customer Concentration Risk |  |  |  |  |
Concentrations |  |  |  |  |
Number of major customers | 4 issc_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |  | 4 issc_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 3 issc_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 4 issc_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Revenues Net | Customer Concentration Risk | Pilatus Aircraft Limited |  |  |  |  |
Concentrations |  |  |  |  |
Sales percentage | 28.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_PilatusAircraftLimitedMember |  | 33.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_PilatusAircraftLimitedMember | 19.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_PilatusAircraftLimitedMember | 16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_PilatusAircraftLimitedMember
Revenues Net | Customer Concentration Risk | Eclipse Aerospace Inc |  |  |  |  |
Concentrations |  |  |  |  |
Sales percentage | 16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_EclipseAerospaceIncMember |  | 22.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_EclipseAerospaceIncMember |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_EclipseAerospaceIncMember
Revenues Net | Customer Concentration Risk | US Department of Defense |  |  |  |  |
Concentrations |  |  |  |  |
Sales percentage | 14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_USDepartmentOfDefenseMember |  |  |  | 13.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_USDepartmentOfDefenseMember
Revenues Net | Customer Concentration Risk | iAccess Technologies, Inc |  |  |  |  |
Concentrations |  |  |  |  |
Sales percentage | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_IAccessTechnologiesIncMember |  | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_IAccessTechnologiesIncMember |  |
Revenues Net | Customer Concentration Risk | Icelandair, Inc. |  |  |  |  |
Concentrations |  |  |  |  |
Sales percentage |  |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_IcelandairIncMember |  |
Revenues Net | Customer Concentration Risk | Fed Ex Corporation |  |  |  |  |
Concentrations |  |  |  |  |
Sales percentage |  |  |  | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_FedExCorporationMember | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_FedExCorporationMember
Revenues Net | Customer Concentration Risk | Kanematsu Aerospace Corp |  |  |  |  |
Concentrations |  |  |  |  |
Sales percentage |  |  |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = issc_KanematsuAerospaceCorpMember |
Inventory | Supplier Concentration Risk |  |  |  |  |
Concentrations |  |  |  |  |
Number of major suppliers | 2 issc_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember |  | 3 issc_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 2 issc_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember | 2 issc_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember

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