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Note 12 - Other Financial Data - Balance Sheet Information (Details) (USD $) | Mar. 28, 2015 | Sep. 27, 2014
--- | --- | ---
Accounts receivable, net: |  |
Accounts receivable | $ 44,643,000 us-gaap_AccountsReceivableGrossCurrent | $ 52,099,000 us-gaap_AccountsReceivableGrossCurrent
Less allowance for doubtful accounts | (618,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | (888,000)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Total | 44,025,000 us-gaap_AccountsReceivableNetCurrent | 51,211,000 us-gaap_AccountsReceivableNetCurrent
Inventories: |  |
Raw materials | 42,471,000 us-gaap_InventoryRawMaterialsNetOfReserves | 49,200,000 us-gaap_InventoryRawMaterialsNetOfReserves
Work in process | 3,324,000 us-gaap_InventoryWorkInProcessNetOfReserves | 3,789,000 us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods | 37,644,000 us-gaap_InventoryFinishedGoodsNetOfReserves | 28,910,000 us-gaap_InventoryFinishedGoodsNetOfReserves
Total | 83,439,000 us-gaap_InventoryNet | 81,899,000 us-gaap_InventoryNet
Other current assets: |  |
Income tax receivable | 1,612,000 us-gaap_IncomeTaxReceivable | 760,000 us-gaap_IncomeTaxReceivable
Current deferred tax asset | 1,342,000 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent | 2,122,000 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Prepaid insurance | 1,141,000 us-gaap_PrepaidExpenseCurrent | 1,890,000 us-gaap_PrepaidExpenseCurrent
Other | 792,000 us-gaap_OtherAssetsMiscellaneousCurrent | 1,661,000 us-gaap_OtherAssetsMiscellaneousCurrent
Total | 4,887,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent | 6,433,000 us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Other assets: |  |
Cash surrender value of life insurance policies | 7,306,000 us-gaap_CashSurrenderValueOfLifeInsurance | 6,867,000 us-gaap_CashSurrenderValueOfLifeInsurance
Assets held for sale | 2,655,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsNoncurrent | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationLongLivedAssetsNoncurrent
Capitalized financing costs, net | 18,000 us-gaap_DeferredFinanceCostsNoncurrentNet | 69,000 us-gaap_DeferredFinanceCostsNoncurrentNet
Other | 97,000 us-gaap_OtherAssetsMiscellaneousNoncurrent | 99,000 us-gaap_OtherAssetsMiscellaneousNoncurrent
Total | 10,076,000 us-gaap_OtherAssetsNoncurrent | 7,035,000 us-gaap_OtherAssetsNoncurrent
Property, plant and equipment, net: |  |
Land and land improvements | 9,214,000 us-gaap_LandAndLandImprovements | 9,704,000 us-gaap_LandAndLandImprovements
Buildings | 42,608,000 us-gaap_BuildingsAndImprovementsGross | 42,047,000 us-gaap_BuildingsAndImprovementsGross
Machinery and equipment | 136,430,000 us-gaap_MachineryAndEquipmentGross | 133,699,000 us-gaap_MachineryAndEquipmentGross
Construction in progress | 6,331,000 us-gaap_ConstructionInProgressGross | 7,648,000 us-gaap_ConstructionInProgressGross
| 194,583 us-gaap_PropertyPlantAndEquipmentGross | 193,098 us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation | (107,419,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (102,712,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total | 87,164,000 us-gaap_PropertyPlantAndEquipmentNet | 90,386,000 us-gaap_PropertyPlantAndEquipmentNet
Accrued expenses: |  |
Salaries, wages and related expenses | 2,661,000 us-gaap_AccruedSalariesCurrent | 4,659,000 us-gaap_AccruedSalariesCurrent
Customer rebates | 862,000 us-gaap_CustomerRefundLiabilityCurrent | 1,530,000 us-gaap_CustomerRefundLiabilityCurrent
Pension plan | 725,000 us-gaap_DefinedBenefitPensionPlanLiabilitiesCurrent | 825,000 us-gaap_DefinedBenefitPensionPlanLiabilitiesCurrent
Restructuring liabilities | 564,000 us-gaap_RestructuringReserveCurrent | 481,000 us-gaap_RestructuringReserveCurrent
Property taxes | 509,000 us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent | 1,242,000 us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Deferred revenues | 287,000 us-gaap_DeferredRevenueCurrent | 525,000 us-gaap_DeferredRevenueCurrent
Workers' compensation | 284,000 us-gaap_WorkersCompensationLiabilityCurrent | 290,000 us-gaap_WorkersCompensationLiabilityCurrent
Interest | 37,000 us-gaap_InterestPayableCurrent | 28,000 us-gaap_InterestPayableCurrent
Other | 798,000 us-gaap_OtherAccruedLiabilitiesCurrent | 795,000 us-gaap_OtherAccruedLiabilitiesCurrent
Total | 6,727,000 us-gaap_AccruedLiabilitiesCurrent | 10,375,000 us-gaap_AccruedLiabilitiesCurrent
Other liabilities: |  |
Deferred compensation | 7,644,000 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent | 7,426,000 us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Deferred income taxes | 6,620,000 us-gaap_DeferredTaxLiabilitiesNoncurrent | 6,572,000 us-gaap_DeferredTaxLiabilitiesNoncurrent
Other | 661,000 iiin_OtherLiabilitiesOtherNoncurrent | 728,000 iiin_OtherLiabilitiesOtherNoncurrent
Total | $ 14,925,000 us-gaap_OtherLiabilitiesNoncurrent | $ 14,726,000 us-gaap_OtherLiabilitiesNoncurrent

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