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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 | $ 6,694,000 us-gaap_NetIncomeLoss | $ 6,269,000 us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by (used for) operating activities: |  |
Depreciation and amortization | 5,797,000 us-gaap_DepreciationDepletionAndAmortization | 4,902,000 us-gaap_DepreciationDepletionAndAmortization
Amortization of capitalized financing costs | 51,000 us-gaap_AmortizationOfFinancingCosts | 51,000 us-gaap_AmortizationOfFinancingCosts
Stock-based compensation expense | 1,273,000 us-gaap_ShareBasedCompensation | 1,228,000 us-gaap_ShareBasedCompensation
Deferred income taxes | 828,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 217,000 us-gaap_DeferredIncomeTaxExpenseBenefit
Asset impairment charges | 237,000 us-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 | 510,000 us-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 | 7,023,000 us-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 | 7,872,000 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Other changes | 651,000 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | 130,000 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Total adjustments | (8,522,000)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | 1,690,000 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by (used for) operating activities | (1,828,000)us-gaap_NetCashProvidedByUsedInOperatingActivities | 7,959,000 us-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 | 480,000 us-gaap_ProceedsFromPreviousAcquisition | 0 us-gaap_ProceedsFromPreviousAcquisition
Proceeds from fire loss insurance | 1,613,000 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities | 135,000 us-gaap_ProceedsFromInsuranceSettlementInvestingActivities
Proceeds from sale of property, plant and equipment | 89,000 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 0 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Proceeds from surrender of life insurance policies | 40,000 iiin_ProceedsFromSurrenderOfLifeInsurancePolicies | 113,000 iiin_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 | 60,474,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 217,000 us-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 | 176,000 us-gaap_ProceedsFromStockOptionsExercised | 175,000 us-gaap_ProceedsFromStockOptionsExercised
Excess tax benefits from stock-based compensation | 147,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 191,000 us-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 | 8,971,000 us-gaap_NetCashProvidedByUsedInFinancingActivities | (1,233,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase in cash and cash equivalents | 3,122,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 3,741,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 3,050,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 15,440,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 6,172,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 19,181,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosures of Cash Flow Information: |  |
Interest | 93,000 us-gaap_InterestPaid | 2,000 us-gaap_InterestPaid
Income taxes, net | 3,403,000 us-gaap_IncomeTaxesPaid | 2,502,000 us-gaap_IncomeTaxesPaid
Non-cash investing and financing activities: |  |
Purchases of property, plant and equipment in accounts payable | 227,000 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 375,000 us-gaap_CapitalExpendituresIncurredButNotYetPaid
Restricted stock units and stock options surrendered for withholding taxes payable | $ 248,000 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation | $ 505,000 us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation

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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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