XML 51 R23.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Note 6 - Stock-Based Compensation (Tables) | 6 Months Ended
--- | ---
Mar. 28, 2015
Notes Tables |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | March 28, |  |  | March 29, |  |  | March 28, |  |  | March 29, |
(In thousands) |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Stock options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense |  | $ | 382 |  |  | $ | 358 |  |  | $ | 555 |  |  | $ | 523 |
Excess tax benefits |  |  | (147 | ) |  |  | (105 | ) |  |  | (147 | ) |  |  | (191 | )
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Six Months Ended |
|  | March 28, |  |  | March 29, |
|  | 2015 |  |  | 2014 |
Risk-free interest rate |  |  | 1.77 | % |  |  | 1.56 | %
Dividend yield |  |  | 0.55 | % |  |  | 0.62 | %
Expected volatility |  |  | 37.39 | % |  |  | 41.46 | %
Expected term (in years) |  |  | 5.67 |  |  |  | 4.94 |
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  | Contractual |  |  | Aggregate |
|  | Options |  |  | Exercise Price Per Share |  |  | Term - Weighted |  |  | Intrinsic |
|  | Outstanding |  |  |  |  |  |  |  | Weighted |  |  | Average |  |  | Value |
|  | (in thousands) |  |  | Range |  |  | Average |  |  | (in years) |  |  | (in thousands) |
Outstanding at September 27, 2014 |  |  | 871 |  |  | $6.89 | - | $20.50 |  |  | $ | 14.23 |  |  |  |  |  |  |  |  |
Granted |  |  | 63 |  |  | 21.96 | - | 21.96 |  |  |  | 21.96 |  |  |  |  |  |  |  |  |
Exercised |  |  | (23 | ) |  | 6.89 | - | 11.15 |  |  |  | 8.99 |  |  |  |  |  |  | $ | 284 |
Outstanding at March 28, 2015 |  |  | 911 |  |  | 7.55 | - | 21.96 |  |  |  | 14.90 |  |  |  | 6.27 |  |  |  | 5,325 |
Vested and anticipated to vest in the future at March 28, 2015 |  |  | 907 |  |  |  |  |  |  |  |  | 14.89 |  |  |  | 6.26 |  |  |  | 5,316 |
Exercisable at March 28, 2015 |  |  | 637 |  |  |  |  |  |  |  |  | 13.33 |  |  |  | 5.14 |  |  |  | 4,674 |
Schedule of RSU Grants and Compensation Expense [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | March 28, |  |  | March 29, |  |  | March 28, |  |  | March 29, |
(In thousands) |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Restricted stock unit grants: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units |  |  | 36 |  |  |  | 40 |  |  |  | 36 |  |  |  | 40 |
Market value |  | $ | 790 |  |  | $ | 763 |  |  | $ | 790 |  |  | $ | 763 |
Compensation expense |  |  | 449 |  |  |  | 462 |  |  |  | 718 |  |  |  | 705 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] |
|  |  |  |  |  | Weighted |
|  | Restricted |  |  | Average |
|  | Stock Units |  |  | Grant Date |
(Unit amounts in thousands) |  | Outstanding |  |  | Fair Value |
Balance, September 27, 2014 |  |  | 197 |  |  | $ | 15.68 |
Granted |  |  | 36 |  |  |  | 21.96 |
Released |  |  | (50 | ) |  |  | 14.99 |
Balance, March 28, 2015 |  |  | 183 |  |  |  | 17.09 |

X
- Definition Schedule of RSU grants and compensation expense [table text block] + References No definition available. + Details
Name: | iiin_ScheduleOfRsuGrantsAndCompensationExpenseTableTextBlock
Namespace Prefix: | iiin_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
Name: | us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration