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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	2issc_NumberOfBanks		2issc_NumberOfBanks
Allowance for doubtful accounts	$ 3.6issc_ProvisionForLossOnUnbilledReceivables	$ 3.7issc_ProvisionForLossOnUnbilledReceivables
Revenues Net | Customer Concentration Risk
Concentrations
Number of major customers	4issc_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember		4issc_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	3issc_NumberOfMajorCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_RevenuesNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	4issc_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	2issc_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember		3issc_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember	2issc_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember	2issc_NumberOfMajorSuppliers / us-gaap_ConcentrationRiskByBenchmarkAxis = issc_InventoryMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember

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