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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Cash Flows From Operating Activities:    
Net earnings $ 6,694,000us-gaap_NetIncomeLoss $ 6,269,000us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by (used for) operating activities:    
Depreciation and amortization 5,797,000us-gaap_DepreciationDepletionAndAmortization 4,902,000us-gaap_DepreciationDepletionAndAmortization
Amortization of capitalized financing costs 51,000us-gaap_AmortizationOfFinancingCosts 51,000us-gaap_AmortizationOfFinancingCosts
Stock-based compensation expense 1,273,000us-gaap_ShareBasedCompensation 1,228,000us-gaap_ShareBasedCompensation
Deferred income taxes 828,000us-gaap_DeferredIncomeTaxExpenseBenefit 217,000us-gaap_DeferredIncomeTaxExpenseBenefit
Asset impairment charges 237,000us-gaap_AssetImpairmentCharges  
Excess tax benefits from stock-based compensation (147,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (191,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Loss (gain) on sale of property, plant and equipment (1,679,000)us-gaap_GainLossOnSaleOfPropertyPlantEquipment 510,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Increase in cash surrender value of life insurance policies over premiums paid (283,000)us-gaap_LifeInsuranceCorporateOrBankOwnedChangeInValue (358,000)us-gaap_LifeInsuranceCorporateOrBankOwnedChangeInValue
Net changes in assets and liabilities (net of assets and liabilities acquired):    
Accounts receivable, net 7,023,000us-gaap_IncreaseDecreaseInAccountsReceivable (65,000)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (1,540,000)us-gaap_IncreaseDecreaseInInventories (12,606,000)us-gaap_IncreaseDecreaseInInventories
Accounts payable and accrued expenses (20,733,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 7,872,000us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Other changes 651,000us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 130,000us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Total adjustments (8,522,000)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities 1,690,000us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by (used for) operating activities (1,828,000)us-gaap_NetCashProvidedByUsedInOperatingActivities 7,959,000us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows From Investing Activities:    
Capital expenditures (4,587,000)us-gaap_PaymentsToAcquireProductiveAssets (2,964,000)us-gaap_PaymentsToAcquireProductiveAssets
Acquisition of intangible asset (1,460,000)us-gaap_PaymentsToAcquireIntangibleAssets  
Acquisition of business 480,000us-gaap_ProceedsFromPreviousAcquisition 0us-gaap_ProceedsFromPreviousAcquisition
Proceeds from fire loss insurance 1,613,000us-gaap_ProceedsFromInsuranceSettlementInvestingActivities 135,000us-gaap_ProceedsFromInsuranceSettlementInvestingActivities
Proceeds from sale of property, plant and equipment 89,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 0us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Proceeds from surrender of life insurance policies 40,000iiin_ProceedsFromSurrenderOfLifeInsurancePolicies 113,000iiin_ProceedsFromSurrenderOfLifeInsurancePolicies
Increase in cash surrender value of life insurance policies (196,000)iiin_IncreaseInCashSurrenderValueOfLifeInsurancePolicies (269,000)iiin_IncreaseInCashSurrenderValueOfLifeInsurancePolicies
Net cash used for investing activities (4,021,000)us-gaap_NetCashProvidedByUsedInInvestingActivities (2,985,000)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows From Financing Activities:    
Proceeds from long-term debt 60,474,000us-gaap_ProceedsFromIssuanceOfLongTermDebt 217,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
Principal payments on long-term debt (50,474,000)us-gaap_RepaymentsOfLongTermDebt (217,000)us-gaap_RepaymentsOfLongTermDebt
Cash dividends paid (1,104,000)us-gaap_PaymentsOfDividendsCommonStock (1,094,000)us-gaap_PaymentsOfDividendsCommonStock
Cash received from exercise of stock options 176,000us-gaap_ProceedsFromStockOptionsExercised 175,000us-gaap_ProceedsFromStockOptionsExercised
Excess tax benefits from stock-based compensation 147,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 191,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Payment of employee tax withholdings related to net share transactions (248,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (505,000)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Net cash provided by (used for) financing activities 8,971,000us-gaap_NetCashProvidedByUsedInFinancingActivities (1,233,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase in cash and cash equivalents 3,122,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 3,741,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 3,050,000us-gaap_CashAndCashEquivalentsAtCarryingValue 15,440,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 6,172,000us-gaap_CashAndCashEquivalentsAtCarryingValue 19,181,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosures of Cash Flow Information:    
Interest 93,000us-gaap_InterestPaid 2,000us-gaap_InterestPaid
Income taxes, net 3,403,000us-gaap_IncomeTaxesPaid 2,502,000us-gaap_IncomeTaxesPaid
Non-cash investing and financing activities:    
Purchases of property, plant and equipment in accounts payable 227,000us-gaap_CapitalExpendituresIncurredButNotYetPaid 375,000us-gaap_CapitalExpendituresIncurredButNotYetPaid
Restricted stock units and stock options surrendered for withholding taxes payable $ 248,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation $ 505,000us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation