XML 20 R70.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Note 11 - Employee Benefit Plans (Details) (USD $) | 12 Months Ended | 36 Months Ended
--- | --- | ---
Sep. 27, 2014 | Sep. 28, 2013 | Sep. 29, 2012 | Sep. 27, 2014
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Pension Contributions | $ 240,000 | $ 307,000 | $ 206,000 |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | 261,000 |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments |  |  | (95,000) |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent |  |  |  | 75.00%
Defined Contribution Plan, Cost Recognized | 862,000 | 758,000 | 734,000 |
Equity Funds [Member] |  |  |  |
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 60.00% |  |  |
Fixed Income Funds [Member] |  |  |  |
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 40.00% |  |  |
SERPs Supported by Life Insurance Policies [Member] | Supplemental Employee Retirement Plan [Member] |  |  |  |
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Benefits Paid | 25,000 | 28,000 | 62,000 |
First One Percent Of Defined Contribution Plan [Member] | Retirement Savings Plan [Member] |  |  |  |
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 100.00% | 100.00% | 100.00% |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 1.00% | 1.00% | 1.00% |
Second Five Percent Of Defined Contribution Plan [Member] | Retirement Savings Plan [Member] |  |  |  |
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% | 50.00% | 50.00% |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | 5.00% | 5.00% | 5.00% |
Minimum [Member] | Supplemental Employee Retirement Plan [Member] |  |  |  |
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Employment Term | 15 years |  |  |
Minimum [Member] | Reduced SERP [Member] |  |  |  |
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Employment Term | 10 years |  |  |
Pension Plan [Member] |  |  |  |
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Future Amortization of Gain (Loss) | (47,000) |  |  |
Supplemental Employee Retirement Plan [Member] |  |  |  |
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Future Amortization of Gain (Loss) | 83,000 |  |  |
Defined Benefit Plan, Employment Term | 30 years |  |  |
Defined Benefit Plan, Percent of Highest Average Salary Base | 50.00% |  |  |
Defined Benefit Plan, Number of Years in Average Annual Base Salary | 5 years |  |  |
Defined Benefit Plan, Benefits Paid | 290,000 | 245,000 | 244,000 |
Postemployment Benefits, Period Expense | 16,000 | 15,000 | 15,000 |
Reduced SERP [Member] |  |  |  |
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Retirement Age | 65 years |  |  |
VEBA [Member] |  |  |  |
Note 11 - Employee Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan, Cost Recognized | 4,600,000 | 3,600,000 | 3,400,000 |
Healthcare Coverage Claims In Excess Of | $ 175,000 |  |  |

X
- Definition The amount of time that a Participant must remain in continuous service with the Company to be eligible for supplemental retirement benefits. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanEmploymentTerm
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of consecutive years used to determine a Participants highest base salary in a supplemental employee retirement plan. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanNumberOfYearsInAverageAnnualBaseSalary
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of a Participants highest average base salary that will be matched and payed out to the Participant as supplemental retirement benefits if they meet the continuous service requirement. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanPercentofHighestAverageSalaryBase
Namespace Prefix: | iiin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum age that an employee may retire at to receive full benefits. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanRetirementAge
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount at which stop-loss insurance covers the remainder of the claim. + References No definition available. + Details
Name: | iiin_HealthcareCoverageClaimsInExcessOf
Namespace Prefix: | iiin_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | iiin_Note11EmployeeBenefitPlansDetailsLineItems
Namespace Prefix: | iiin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506309 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanBenefitsPaid
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
Name: | us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash or cash equivalents contributed by the entity to fund its pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
Name: | us-gaap_PensionContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Period expense related to postemployment benefits. + References No definition available. + Details
Name: | us-gaap_PostemploymentBenefitsPeriodExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration