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Pay vs Performance Disclosure | 12 Months Ended | 24 Months Ended | 36 Months Ended | 48 Months Ended
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Sep. 28, 2024 USD ($) | Sep. 30, 2023 USD ($) | Oct. 01, 2022 USD ($) | Oct. 02, 2021 USD ($) | Oct. 01, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 28, 2024 USD ($)
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Pay vs Performance Disclosure, Table | ### Pay Versus Performance Pursuant to Item 402(v) of SEC Regulation S-K, we are providing the following disclosure regarding executive compensation for our principal executive officer (“PEO”), Mr. Woltz, and our other NEOs (“Non-PEO NEOs”) and Company performance for the fiscal years listed below.
Year |  | Summary Compensation Table Total for H.O. Woltz III ($) |  | Compensation Actually Paid to H.O. Woltz III(1)(2) ($) |  | Average Summary Compensation Table Total for Non-PEO NEOs(3) ($) |  | Average Compensation Actually Paid to Non-PEO NEOs(1)(2)(3) ($) |  | Value of Initial Fixed $100 Investment Based on: |  |  |  |  |
|  |  |  |  | Total Shareholder Return ($) |  | Peer Group Total Shareholder Return(4) ($) |  | Net income ($ Thousands) |  | Return on Invested Capital(5) (%) |
2024 |  | 2,104,016 |  | 1,717,527 |  | 697,553 |  | 587,848 |  | 212.31 |  | 231.87 |  | 19,305 |  | 6.3 |
2023 |  | 2,146,512 |  | 2,297,925 |  | 594,499 |  | 553,469 |  | 207.28 |  | 146.15 |  | 32,415 |  | 9.1 |
2022 |  | 2,503,834 |  | 1,508,180 |  | 924,155 |  | 672,291 |  | 157.60 |  | 109.34 |  | 125,011 |  | 47.6 |
2021 |  | 2,475,749 |  | 4,043,446 |  | 972,237 |  | 1,368,777 |  | 219.98 |  | 144.86 |  | 66,610 |  | 36.9 |
Company Selected Measure Name | return on invested capital |  |  |  |  |  |
Named Executive Officers, Footnote |
(1) | The amounts shown for Compensation Actually Paid have been calculated in accordance with Item 402(v) of Regulation S-K, and therefore use hypothetical values and points in time when pay may not actually have been earned or delivered to the NEOs. These amounts reflect total compensation as reported in the Summary Compensation Table with certain adjustments as described in footnote 2 below.
PEO Total Compensation Amount | $ 2,104,016 | $ 2,146,512 | $ 2,503,834 | $ 2,475,749 |  |  |
PEO Actually Paid Compensation Amount | $ 1,717,527 | 2,297,925 | 1,508,180 | 4,043,446 |  |  |
Adjustment To PEO Compensation, Footnote | H.O. Woltz III
| Year |  | Summary Compensation Table Total ($) |  | Exclusion of Change in Pension Value ($) |  | Exclusion of Stock Awards and Option Awards ($) |  | Inclusion of Pension Service Cost ($) |  | Inclusion of Equity Values ($) |  | Compensation Actually Paid ($)
| 2024 |  | 2,104,016 |  | 177,548 |  | 912,516 |  | — |  | 703,575 |  | 1,717,527
| 2023 |  | 2,146,512 |  | — |  | 700,001 |  | — |  | 851,414 |  | 2,297,925
| 2022 |  | 2,503,834 |  | — |  | 650,001 |  | — |  | (345,653 | ) | 1,508,180
| 2021 |  | 2,475,749 |  | 195,092 |  | 600,027 |  | 46,686 |  | 2,316,130 |  | 4,043,446
H.O. Woltz III
| Year |  | Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year ($) |  | Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards ($) |  | Vesting Date Fair Value of Equity Awards Granted During Year that Vested During Year ($) |  | Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year ($) |  | Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year ($) |  | Value of Dividends or Other Earnings Paid on Equity Awards Not Otherwise Included ($) |  | Total - Inclusion of Equity Values ($)
| 2024 |  | 796,871 |  | (81,398 | ) | — |  | (11,898 | ) | — |  | — |  | 703,575
| 2023 |  | 671,800 |  | 109,575 |  | — |  | 70,039 |  | — |  | — |  | 851,414
| 2022 |  | 436,799 |  | (561,775 | ) | — |  | (220,677 | ) | — |  | — |  | (345,653)
| 2021 |  | 683,259 |  | 1,129,842 |  | — |  | 503,029 |  | — |  | — |  | 2,316,130
Non-PEO NEO Average Total Compensation Amount | $ 697,553 | 594,499 | 924,155 | 972,237 |  |  |
Non-PEO NEO Average Compensation Actually Paid Amount | $ 587,848 | 553,469 | 672,291 | 1,368,777 |  |  |
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | Non-PEO NEOs (Average)
| Year |  | Summary Compensation Table Total ($) |  | Exclusion of Change in Pension Value ($) |  | Exclusion of Stock Awards and Option Awards ($) |  | Inclusion of Pension Service Cost ($) |  | Inclusion of Equity Values ($) |  | Compensation Actually Paid ($)
| 2024 |  | 697,553 |  | 96,938 |  | 206,247 |  | 41,515 |  | 151,965 |  | 587,848
| 2023 |  | 594,499 |  | 19,971 |  | 150,000 |  | 30,438 |  | 98,503 |  | 553,469
| 2022 |  | 924,155 |  | 8,192 |  | 206,242 |  | 48,049 |  | (85,479 | ) | 672,291
| 2021 |  | 972,237 |  | 80,988 |  | 196,254 |  | 47,191 |  | 626,592 |  | 1,368,777
Non-PEO NEOs (Average)
| Year |  | Year-End Fair Value of Equity Awards Granted During Year That Remained Unvested as of Last Day of Year ($) |  | Change in Fair Value from Last Day of Prior Year to Last Day of Year of Unvested Equity Awards ($) |  | Vesting Date Fair Value of Equity Awards Granted During Year that Vested During Year ($) |  | Change in Fair Value from Last Day of Prior Year to Vesting Date of Unvested Equity Awards that Vested During Year ($) |  | Fair Value at Last Day of Prior Year of Equity Awards Forfeited During Year ($) |  | Value of Dividends or Other Earnings Paid on Equity Awards Not Otherwise Included ($) |  | Total - Inclusion of Equity Values ($)
| 2024 |  | 177,685 |  | (21,465 | ) | — |  | (4,255 | ) | — |  | — |  | 151,965
| 2023 |  | 143,885 |  | 23,577 |  | — |  | 15,115 |  | (84,074 | ) | — |  | 98,503
| 2022 |  | 137,475 |  | (166,711 | ) | — |  | (56,242 | ) | — |  | — |  | (85,479)
| 2021 |  | 223,475 |  | 284,514 |  | — |  | 118,603 |  | — |  | — |  | 626,592
Compensation Actually Paid vs. Total Shareholder Return [Text Block] | DESCRIPTION OF RELATIONSHIP BETWEEN PEO AND OTHER NEO COMPENSATION ACTUALLY PAID AND INSTEEL TOTAL SHAREHOLDER RETURN (“TSR”) The following chart sets forth the relationship between Compensation Actually Paid to Mr. Woltz, the average of Compensation Actually Paid to our other NEOs, and our cumulative TSR over the three most recently completed fiscal years. |  |  |  |  |  |
Compensation Actually Paid vs. Net Income [Text Block] | DESCRIPTION OF RELATIONSHIP BETWEEN PEO AND OTHER NEO COMPENSATION ACTUALLY PAID AND NET INCOME The following chart sets forth the relationship between Compensation Actually Paid to Mr. Woltz, the average of Compensation Actually Paid to our other NEOs, and our net income over the three most recently completed fiscal years. |  |  |  |  |  |
Compensation Actually Paid vs. Company Selected Measure [Text Block] | DESCRIPTION OF RELATIONSHIP BETWEEN PEO AND OTHER NEO COMPENSATION ACTUALLY PAID AND RETURN ON INVESTED CAPITAL The following chart sets forth the relationship between Compensation Actually Paid to Mr. Woltz, the average of Compensation Actually Paid to our other NEOs, and our return on invested capital over the three most recently completed fiscal years. |  |  |  |  |  |
Total Shareholder Return Vs Peer Group [Text Block] | DESCRIPTION OF RELATIONSHIP BETWEEN INSTEEL TSR AND PEER GROUP TSR The following chart compares our cumulative TSR over the three most recently completed fiscal years to that of the S&P 500 Building Products Index over the same period. |  |  |  |  |  |
Tabular List [Table Text Block] | MOST IMPORTANT FINANCIAL MEASURE The Committee believes that return on invested capital was, for the most recently completed fiscal year, the most appropriate metric for linking pay and performance in that it is driven off both the generation of earnings and responsible management of our balance sheet and is closely correlated with the creation of shareholder value. Return on invested capital was the only financial measure used by Insteel to link the Compensation Actually Paid to Mr. Woltz and our other NEOs for fiscal 2024 to company performance. The Committee does not utilize nonfinancial performance metrics to determine the compensation of Mr. Woltz or our other NEOs. |  |  |  |  |  |
Total Shareholder Return Amount |  |  |  | 219.98 | $ 157.60 | $ 207.28 | $ 212.31
Peer Group Total Shareholder Return Amount |  |  |  | 144.86 | $ 109.34 | $ 146.15 | $ 231.87
Net Income (Loss) Attributable to Parent | $ 19,305,000 | $ 32,415,000 | $ 125,011,000 | $ 66,610,000 |  |  |
Company Selected Measure Amount | 6.3 | 9.1 | 47.6 | 36.9 |  |  |
PEO Name | H.O. Woltz III | H.O. Woltz III | H.O. Woltz III | H.O. Woltz III |  |  |
Measure [Axis]: 1 |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Name | return on invested capital |  |  |  |  |  |
PEO [Member] | Exclusion Of Change In Pension Value [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | $ 177,548 | $ 0 | $ 0 | $ 195,092 |  |  |
PEO [Member] | Exclusion Of Stock Awards And Option Awards [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 912,516 | 700,001 | 650,001 | 600,027 |  |  |
PEO [Member] | Inclusion Of Pension Service Cost [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0 | 46,686 |  |  |
PEO [Member] | Inclusion Of Equity Values [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 703,575 | 851,414 | (345,653) | 2,316,130 |  |  |
PEO [Member] | Year End Fair Value Of Equity Awards Granted During Year That Remained Unvested As Of Last Day Of Year [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 796,871 | 671,800 | 436,799 | 683,259 |  |  |
PEO [Member] | Change In Fair Value From Last Day Of Prior Year To Last Day Of Year Of Unvested Equity Awards [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | (81,398) | 109,575 | (561,775) | 1,129,842 |  |  |
PEO [Member] | Vesting Date Fair Value Of Equity Awards Granted During Year That Vested During Year [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0 | 0 |  |  |
PEO [Member] | Change In Fair Value From Last Day Of Prior Year To Vesting Date Of Unvested Equity Awards That Vested During Year [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | (11,898) | 70,039 | (220,677) | 503,029 |  |  |
PEO [Member] | Fair Value At Last Day Of Prior Year Of Equity Awards Forfeited During Year [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0 | 0 |  |  |
PEO [Member] | Value Of Dividends Or Other Earnings Paid On Equity Awards Not Otherwise Included [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0 | 0 |  |  |
PEO [Member] | Total Inclusion Of Equity Values [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 703,575 | 851,414 | (345,653) | 2,316,130 |  |  |
Non-PEO NEO [Member] | Exclusion Of Change In Pension Value [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 96,938 | 19,971 | 8,192 | 80,988 |  |  |
Non-PEO NEO [Member] | Exclusion Of Stock Awards And Option Awards [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 206,247 | 150,000 | 206,242 | 196,254 |  |  |
Non-PEO NEO [Member] | Inclusion Of Pension Service Cost [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 41,515 | 30,438 | 48,049 | 47,191 |  |  |
Non-PEO NEO [Member] | Inclusion Of Equity Values [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 151,965 | 98,503 | (85,479) | 626,592 |  |  |
Non-PEO NEO [Member] | Year End Fair Value Of Equity Awards Granted During Year That Remained Unvested As Of Last Day Of Year [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 177,685 | 143,885 | 137,475 | 223,475 |  |  |
Non-PEO NEO [Member] | Change In Fair Value From Last Day Of Prior Year To Last Day Of Year Of Unvested Equity Awards [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | (21,465) | 23,577 | (166,711) | 284,514 |  |  |
Non-PEO NEO [Member] | Vesting Date Fair Value Of Equity Awards Granted During Year That Vested During Year [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0 | 0 |  |  |
Non-PEO NEO [Member] | Change In Fair Value From Last Day Of Prior Year To Vesting Date Of Unvested Equity Awards That Vested During Year [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | (4,255) | 15,115 | (56,242) | 118,603 |  |  |
Non-PEO NEO [Member] | Fair Value At Last Day Of Prior Year Of Equity Awards Forfeited During Year [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 0 | (84,074) | 0 | 0 |  |  |
Non-PEO NEO [Member] | Value Of Dividends Or Other Earnings Paid On Equity Awards Not Otherwise Included [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0 | 0 |  |  |
Non-PEO NEO [Member] | Total Inclusion Of Equity Values [Member] |  |  |  |  |  |  |
Pay vs Performance Disclosure [Table] |  |  |  |  |  |  |
Adjustment to Compensation Amount | $ 151,965 | $ 98,503 | $ (85,479) | $ 626,592 |  |  |

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