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Note 12 - Other Financial Data - Balance Sheet Information (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 27, 2014
Sep. 27, 2014
Accounts receivable, net:    
Accounts receivable $ 41,487us-gaap_AccountsReceivableGrossCurrent $ 52,099us-gaap_AccountsReceivableGrossCurrent
Less allowance for doubtful accounts (799)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (888)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Total 40,688us-gaap_AccountsReceivableNetCurrent 51,211us-gaap_AccountsReceivableNetCurrent
Inventories:    
Raw materials 50,871us-gaap_InventoryRawMaterialsNetOfReserves 49,200us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 3,147us-gaap_InventoryWorkInProcessNetOfReserves 3,789us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 33,446us-gaap_InventoryFinishedGoodsNetOfReserves 28,910us-gaap_InventoryFinishedGoodsNetOfReserves
Total 87,464us-gaap_InventoryNet 81,899us-gaap_InventoryNet
Other current assets:    
Prepaid insurance 1,715us-gaap_PrepaidExpenseCurrent 1,890us-gaap_PrepaidExpenseCurrent
Current deferred tax asset 1,538us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 2,122us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other 1,531us-gaap_OtherAssetsMiscellaneousCurrent 2,421us-gaap_OtherAssetsMiscellaneousCurrent
Total 4,784us-gaap_PrepaidExpenseAndOtherAssetsCurrent 6,433us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Other assets:    
Cash surrender value of life insurance policies 6,963us-gaap_CashSurrenderValueOfLifeInsurance 6,867us-gaap_CashSurrenderValueOfLifeInsurance
Capitalized financing costs, net 43us-gaap_DeferredFinanceCostsNoncurrentNet 69us-gaap_DeferredFinanceCostsNoncurrentNet
Other 96us-gaap_OtherAssetsMiscellaneousNoncurrent 99us-gaap_OtherAssetsMiscellaneousNoncurrent
Total 7,102us-gaap_OtherAssetsNoncurrent 7,035us-gaap_OtherAssetsNoncurrent
Property, plant and equipment, net:    
Land and land improvements 9,704us-gaap_LandAndLandImprovements 9,704us-gaap_LandAndLandImprovements
Buildings 44,555us-gaap_BuildingsAndImprovementsGross 42,047us-gaap_BuildingsAndImprovementsGross
Machinery and equipment 136,294us-gaap_MachineryAndEquipmentGross 133,699us-gaap_MachineryAndEquipmentGross
Construction in progress 5,905us-gaap_ConstructionInProgressGross 7,648us-gaap_ConstructionInProgressGross
196,458us-gaap_PropertyPlantAndEquipmentGross 193,098us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation (105,015)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (102,712)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total 91,443us-gaap_PropertyPlantAndEquipmentNet 90,386us-gaap_PropertyPlantAndEquipmentNet
Accrued expenses:    
Salaries, wages and related expenses 2,619us-gaap_AccruedSalariesCurrent 4,659us-gaap_AccruedSalariesCurrent
Customer rebates 1,879us-gaap_CustomerRefundLiabilityCurrent 1,530us-gaap_CustomerRefundLiabilityCurrent
Property taxes 1,342us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 1,242us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Pension plan 774us-gaap_DefinedBenefitPensionPlanLiabilitiesCurrent 825us-gaap_DefinedBenefitPensionPlanLiabilitiesCurrent
Restructuring liabilities 501us-gaap_RestructuringReserveCurrent 481us-gaap_RestructuringReserveCurrent
Accrued income taxes 447us-gaap_AccruedIncomeTaxesCurrent  
Deferred revenues 419us-gaap_DeferredRevenueCurrent 525us-gaap_DeferredRevenueCurrent
Workers' compensation 288us-gaap_WorkersCompensationLiabilityCurrent 290us-gaap_WorkersCompensationLiabilityCurrent
Interest 45us-gaap_InterestPayableCurrent 28us-gaap_InterestPayableCurrent
Other 782us-gaap_OtherAccruedLiabilitiesCurrent 795us-gaap_OtherAccruedLiabilitiesCurrent
Total 9,096us-gaap_AccruedLiabilitiesCurrent 10,375us-gaap_AccruedLiabilitiesCurrent
Other liabilities:    
Deferred compensation 7,541us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent 7,426us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent
Deferred income taxes 6,923us-gaap_DeferredTaxLiabilitiesNoncurrent 6,572us-gaap_DeferredTaxLiabilitiesNoncurrent
Other 699iiin_OtherLiabilitiesOtherNoncurrent 728iiin_OtherLiabilitiesOtherNoncurrent
Total $ 15,163us-gaap_OtherLiabilitiesNoncurrent $ 14,726us-gaap_OtherLiabilitiesNoncurrent