| Form N-CSR Cover | 12 Months Ended |
| Oct. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Tax-Managed Multi-Cap Growth Portfolio |
| Entity Central Index Key | 0001116071 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Oct. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Tax-Managed Multi-Cap Growth Portfolio |
| Entity Central Index Key | 0001116071 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| C000014303 | |
| Shareholder Report [Line Items] | |
| Fund Name | Tax-Managed Multi-Cap Growth Portfolio |
| No Trading Symbol [Flag] | true |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Tax-Managed Multi-Cap Growth Portfolio (the "Fund") for the period of November 1, 2023 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B18"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 12.8px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Fund Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Tax-Managed Multi-Cap Growth Portfolio $82 0.70% |
| Expenses Paid, Amount | $ 82 |
| Expense Ratio, Percent | 0.70% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Russell 3000 ® ↓ An underweight position in microchip supplier NVIDIA Corp. hurt returns as its stock price surged on rising business demand for artificial intelligence (AI) ↓ An overweight position in computer software company Adobe Inc. detracted from returns as rising competition in AI-generated content slowed its revenue growth ↓ An overweight position in Lululemon Athletica Inc., an athletic apparel retailer, hurt returns as demand ― particularly among North American women ― weakened ↓ Not owning Broadcom Inc., a semiconductor maker, hampered Index-relative returns as it reported strong revenue and earnings growth supported by the rise of AI ↑ An overweight position in internet domain registrar and website host GoDaddy Inc. helped Index-relative returns after introducing new AI-automated processes ↑ An overweight position in equipment rental firm United Rentals Inc. helped returns as rising demand and astute acquisitions led to strong revenues and earnings ↑ An overweight position in Monolithic Power Systems Inc., a provider of power circuits, aided relative returns on rising demand in the AI data center market ↑ Not owning Tesla Inc. contributed to returns as the electric vehicle maker lowered prices on several of its car models ― reducing its margins and cash flows |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Tax-Managed Multi-Cap Growth Portfolio S&P 500 ® Russell 3000 ® 10/14 $10,000 $10,000 $10,000 11/14 $10,224 $10,269 $10,298 12/14 $10,158 $10,243 $10,221 1/15 $9,918 $9,936 $10,059 2/15 $10,703 $10,507 $10,733 3/15 $10,566 $10,340 $10,635 4/15 $10,647 $10,440 $10,659 5/15 $10,892 $10,574 $10,828 6/15 $10,780 $10,369 $10,663 7/15 $11,019 $10,586 $10,999 8/15 $10,387 $9,948 $10,317 9/15 $10,005 $9,702 $10,031 10/15 $10,805 $10,520 $10,872 11/15 $10,958 $10,551 $10,930 12/15 $10,729 $10,385 $10,742 1/16 $9,816 $9,869 $10,100 2/16 $9,643 $9,856 $10,091 3/16 $10,331 $10,525 $10,778 4/16 $10,367 $10,566 $10,694 5/16 $10,688 $10,755 $10,907 6/16 $10,479 $10,783 $10,864 7/16 $11,065 $11,181 $11,391 8/16 $11,070 $11,196 $11,348 9/16 $11,096 $11,199 $11,399 10/16 $10,815 $10,994 $11,098 11/16 $10,943 $11,401 $11,394 12/16 $10,917 $11,627 $11,536 1/17 $11,458 $11,847 $11,909 2/17 $11,814 $12,318 $12,388 3/17 $11,886 $12,332 $12,532 4/17 $12,105 $12,459 $12,814 5/17 $12,421 $12,634 $13,114 6/17 $12,355 $12,713 $13,115 7/17 $12,716 $12,974 $13,445 8/17 $12,778 $13,014 $13,671 9/17 $12,946 $13,283 $13,892 10/17 $13,267 $13,593 $14,405 11/17 $13,578 $14,009 $14,841 12/17 $13,732 $14,165 $14,949 1/18 $14,917 $14,976 $15,971 2/18 $14,744 $14,424 $15,549 3/18 $14,407 $14,058 $15,171 4/18 $14,688 $14,112 $15,221 5/18 $15,495 $14,451 $15,910 6/18 $15,720 $14,540 $16,062 7/18 $15,837 $15,081 $16,518 8/18 $16,660 $15,573 $17,430 9/18 $16,619 $15,662 $17,488 10/18 $14,928 $14,591 $15,874 11/18 $14,989 $14,888 $16,049 12/18 $13,734 $13,544 $14,632 1/19 $15,335 $14,629 $15,975 2/19 $15,707 $15,099 $16,580 3/19 $16,068 $15,393 $16,999 4/19 $17,031 $16,016 $17,749 5/19 $15,701 $14,998 $16,614 6/19 $16,696 $16,055 $17,765 7/19 $17,104 $16,286 $18,150 8/19 $16,711 $16,028 $17,969 9/19 $16,617 $16,328 $17,961 10/19 $16,879 $16,681 $18,467 11/19 $17,638 $17,287 $19,304 12/19 $18,116 $17,809 $19,877 1/20 $18,448 $17,802 $20,279 2/20 $17,206 $16,336 $18,892 3/20 $15,279 $14,319 $16,925 4/20 $17,564 $16,154 $19,430 5/20 $18,881 $16,923 $20,765 6/20 $19,587 $17,260 $21,663 7/20 $20,823 $18,233 $23,276 8/20 $22,910 $19,544 $25,621 9/20 $21,877 $18,801 $24,449 10/20 $21,209 $18,301 $23,675 11/20 $23,220 $20,305 $26,202 12/20 $24,194 $21,085 $27,483 1/21 $23,531 $20,872 $27,379 2/21 $24,017 $21,448 $27,435 3/21 $24,204 $22,387 $27,810 4/21 $25,978 $23,582 $29,614 5/21 $25,387 $23,747 $29,176 6/21 $26,646 $24,301 $30,975 7/21 $27,602 $24,878 $31,850 8/21 $28,541 $25,635 $33,001 9/21 $26,696 $24,443 $31,190 10/21 $28,502 $26,155 $33,812 11/21 $27,989 $25,974 $33,903 12/21 $28,674 $27,138 $34,586 1/22 $26,143 $25,734 $31,520 2/22 $25,066 $24,963 $30,264 3/22 $25,756 $25,890 $31,386 4/22 $22,962 $23,632 $27,593 5/22 $22,238 $23,676 $26,958 6/22 $20,614 $21,721 $24,850 7/22 $23,076 $23,724 $27,820 8/22 $21,930 $22,757 $26,585 9/22 $19,633 $20,661 $24,012 10/22 $20,688 $22,334 $25,469 11/22 $21,680 $23,582 $26,583 12/22 $20,197 $22,223 $24,568 1/23 $21,993 $23,619 $26,641 2/23 $21,366 $23,043 $26,326 3/23 $23,002 $23,889 $27,971 4/23 $23,521 $24,262 $28,212 5/23 $24,097 $24,367 $29,426 6/23 $25,636 $25,977 $31,460 7/23 $26,366 $26,812 $32,541 8/23 $26,080 $26,385 $32,176 9/23 $24,741 $25,127 $30,408 10/23 $24,547 $24,599 $29,880 11/23 $27,386 $26,845 $33,113 12/23 $28,634 $28,065 $34,693 1/24 $29,136 $28,536 $35,461 2/24 $30,664 $30,060 $37,901 3/24 $30,561 $31,027 $38,587 4/24 $29,136 $29,760 $36,886 5/24 $30,493 $31,236 $39,084 6/24 $32,140 $32,357 $41,595 7/24 $32,049 $32,750 $41,068 8/24 $32,551 $33,545 $41,861 9/24 $33,098 $34,261 $43,017 10/24 $32,917 $33,950 $42,855 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Tax-Managed Multi-Cap Growth Portfolio 34.79% 14.27% 12.64% S&P 500 ® Index Footnote Reference 38.02% 15.25% 12.99% Russell 3000 ® 43.42% 18.31% 15.65% |
| AssetsNet | $ 275,906,118 |
| Holdings Count | Holding | 46 |
| Advisory Fees Paid, Amount | $ 1,667,643 |
| InvestmentCompanyPortfolioTurnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $275,906,118 # of Portfolio Holdings 46 Portfolio Turnover Rate 8% Total Advisory Fees Paid $1,667,643 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Real Estate 0.5% Short-Term Investments 1.1% Materials 1.7% Consumer Staples 3.2% Financials 6.6% Health Care 9.4% Industrials 10.1% Consumer Discretionary 12.4% Communication Services 13.3% Information Technology 41.7% Top Ten Holdings (% of total investments) Footnote Reference Microsoft Corp. 11.0% Apple, Inc. 9.5% Amazon.com, Inc. 8.3% NVIDIA Corp. 7.1% Alphabet, Inc., Class C 4.6% Alphabet, Inc., Class A 4.5% Meta Platforms, Inc., Class A 4.2% Visa, Inc., Class A 4.1% Salesforce, Inc. 2.9% GoDaddy, Inc., Class A 2.7% Total 58.9% Footnote Description Footnote a Excluding cash equivalents |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Oct. 31, 2024 | Sep. 30, 2024 | Aug. 31, 2024 | Jul. 31, 2024 | Jun. 30, 2024 | May 31, 2024 | Apr. 30, 2024 | Mar. 31, 2024 | Feb. 29, 2024 | Jan. 31, 2024 | Dec. 31, 2023 | Nov. 30, 2023 | Oct. 31, 2023 | Sep. 30, 2023 | Aug. 31, 2023 | Jul. 31, 2023 | Jun. 30, 2023 | May 31, 2023 | Apr. 30, 2023 | Mar. 31, 2023 | Feb. 28, 2023 | Jan. 31, 2023 | Dec. 31, 2022 | Nov. 30, 2022 | Oct. 31, 2022 | Sep. 30, 2022 | Aug. 31, 2022 | Jul. 31, 2022 | Jun. 30, 2022 | May 31, 2022 | Apr. 30, 2022 | Mar. 31, 2022 | Feb. 28, 2022 | Jan. 31, 2022 | Dec. 31, 2021 | Nov. 30, 2021 | Oct. 31, 2021 | Sep. 30, 2021 | Aug. 31, 2021 | Jul. 31, 2021 | Jun. 30, 2021 | May 31, 2021 | Apr. 30, 2021 | Mar. 31, 2021 | Feb. 28, 2021 | Jan. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2020 | Oct. 31, 2020 | Sep. 30, 2020 | Aug. 31, 2020 | Jul. 31, 2020 | Jun. 30, 2020 | May 31, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | Feb. 29, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Nov. 30, 2019 | Oct. 31, 2019 | Sep. 30, 2019 | Aug. 31, 2019 | Jul. 31, 2019 | Jun. 30, 2019 | May 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Jan. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Oct. 31, 2018 | Sep. 30, 2018 | Aug. 31, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | May 31, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Feb. 28, 2018 | Jan. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2017 | Oct. 31, 2017 | Sep. 30, 2017 | Aug. 31, 2017 | Jul. 31, 2017 | Jun. 30, 2017 | May 31, 2017 | Apr. 30, 2017 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2016 | Oct. 31, 2016 | Sep. 30, 2016 | Aug. 31, 2016 | Jul. 31, 2016 | Jun. 30, 2016 | May 31, 2016 | Apr. 30, 2016 | Mar. 31, 2016 | Feb. 29, 2016 | Jan. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2015 | Oct. 31, 2015 | Sep. 30, 2015 | Aug. 31, 2015 | Jul. 31, 2015 | Jun. 30, 2015 | May 31, 2015 | Apr. 30, 2015 | Mar. 31, 2015 | Feb. 28, 2015 | Jan. 31, 2015 | Dec. 31, 2014 | Nov. 30, 2014 | Oct. 31, 2014 | |
| C000014303 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Tax-Managed Multi-Cap Growth Portfolio | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 32,917 | $ 33,098 | $ 32,551 | $ 32,049 | $ 32,140 | $ 30,493 | $ 29,136 | $ 30,561 | $ 30,664 | $ 29,136 | $ 28,634 | $ 27,386 | $ 24,547 | $ 24,741 | $ 26,080 | $ 26,366 | $ 25,636 | $ 24,097 | $ 23,521 | $ 23,002 | $ 21,366 | $ 21,993 | $ 20,197 | $ 21,680 | $ 20,688 | $ 19,633 | $ 21,930 | $ 23,076 | $ 20,614 | $ 22,238 | $ 22,962 | $ 25,756 | $ 25,066 | $ 26,143 | $ 28,674 | $ 27,989 | $ 28,502 | $ 26,696 | $ 28,541 | $ 27,602 | $ 26,646 | $ 25,387 | $ 25,978 | $ 24,204 | $ 24,017 | $ 23,531 | $ 24,194 | $ 23,220 | $ 21,209 | $ 21,877 | $ 22,910 | $ 20,823 | $ 19,587 | $ 18,881 | $ 17,564 | $ 15,279 | $ 17,206 | $ 18,448 | $ 18,116 | $ 17,638 | $ 16,879 | $ 16,617 | $ 16,711 | $ 17,104 | $ 16,696 | $ 15,701 | $ 17,031 | $ 16,068 | $ 15,707 | $ 15,335 | $ 13,734 | $ 14,989 | $ 14,928 | $ 16,619 | $ 16,660 | $ 15,837 | $ 15,720 | $ 15,495 | $ 14,688 | $ 14,407 | $ 14,744 | $ 14,917 | $ 13,732 | $ 13,578 | $ 13,267 | $ 12,946 | $ 12,778 | $ 12,716 | $ 12,355 | $ 12,421 | $ 12,105 | $ 11,886 | $ 11,814 | $ 11,458 | $ 10,917 | $ 10,943 | $ 10,815 | $ 11,096 | $ 11,070 | $ 11,065 | $ 10,479 | $ 10,688 | $ 10,367 | $ 10,331 | $ 9,643 | $ 9,816 | $ 10,729 | $ 10,958 | $ 10,805 | $ 10,005 | $ 10,387 | $ 11,019 | $ 10,780 | $ 10,892 | $ 10,647 | $ 10,566 | $ 10,703 | $ 9,918 | $ 10,158 | $ 10,224 | $ 10,000 |
| EATON VANCE Index: S&P 500 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ®</sup> Index " id="sjs-B9" xml:space="preserve">S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup> Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 33,950 | 34,261 | 33,545 | 32,750 | 32,357 | 31,236 | 29,760 | 31,027 | 30,060 | 28,536 | 28,065 | 26,845 | 24,599 | 25,127 | 26,385 | 26,812 | 25,977 | 24,367 | 24,262 | 23,889 | 23,043 | 23,619 | 22,223 | 23,582 | 22,334 | 20,661 | 22,757 | 23,724 | 21,721 | 23,676 | 23,632 | 25,890 | 24,963 | 25,734 | 27,138 | 25,974 | 26,155 | 24,443 | 25,635 | 24,878 | 24,301 | 23,747 | 23,582 | 22,387 | 21,448 | 20,872 | 21,085 | 20,305 | 18,301 | 18,801 | 19,544 | 18,233 | 17,260 | 16,923 | 16,154 | 14,319 | 16,336 | 17,802 | 17,809 | 17,287 | 16,681 | 16,328 | 16,028 | 16,286 | 16,055 | 14,998 | 16,016 | 15,393 | 15,099 | 14,629 | 13,544 | 14,888 | 14,591 | 15,662 | 15,573 | 15,081 | 14,540 | 14,451 | 14,112 | 14,058 | 14,424 | 14,976 | 14,165 | 14,009 | 13,593 | 13,283 | 13,014 | 12,974 | 12,713 | 12,634 | 12,459 | 12,332 | 12,318 | 11,847 | 11,627 | 11,401 | 10,994 | 11,199 | 11,196 | 11,181 | 10,783 | 10,755 | 10,566 | 10,525 | 9,856 | 9,869 | 10,385 | 10,551 | 10,520 | 9,702 | 9,948 | 10,586 | 10,369 | 10,574 | 10,440 | 10,340 | 10,507 | 9,936 | 10,243 | 10,269 | 10,000 |
| EATON VANCE Index: Russell 3000® Growth Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ®</sup> Growth Index" id="sjs-B13">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup> Growth Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 42,855 | $ 43,017 | $ 41,861 | $ 41,068 | $ 41,595 | $ 39,084 | $ 36,886 | $ 38,587 | $ 37,901 | $ 35,461 | $ 34,693 | $ 33,113 | $ 29,880 | $ 30,408 | $ 32,176 | $ 32,541 | $ 31,460 | $ 29,426 | $ 28,212 | $ 27,971 | $ 26,326 | $ 26,641 | $ 24,568 | $ 26,583 | $ 25,469 | $ 24,012 | $ 26,585 | $ 27,820 | $ 24,850 | $ 26,958 | $ 27,593 | $ 31,386 | $ 30,264 | $ 31,520 | $ 34,586 | $ 33,903 | $ 33,812 | $ 31,190 | $ 33,001 | $ 31,850 | $ 30,975 | $ 29,176 | $ 29,614 | $ 27,810 | $ 27,435 | $ 27,379 | $ 27,483 | $ 26,202 | $ 23,675 | $ 24,449 | $ 25,621 | $ 23,276 | $ 21,663 | $ 20,765 | $ 19,430 | $ 16,925 | $ 18,892 | $ 20,279 | $ 19,877 | $ 19,304 | $ 18,467 | $ 17,961 | $ 17,969 | $ 18,150 | $ 17,765 | $ 16,614 | $ 17,749 | $ 16,999 | $ 16,580 | $ 15,975 | $ 14,632 | $ 16,049 | $ 15,874 | $ 17,488 | $ 17,430 | $ 16,518 | $ 16,062 | $ 15,910 | $ 15,221 | $ 15,171 | $ 15,549 | $ 15,971 | $ 14,949 | $ 14,841 | $ 14,405 | $ 13,892 | $ 13,671 | $ 13,445 | $ 13,115 | $ 13,114 | $ 12,814 | $ 12,532 | $ 12,388 | $ 11,909 | $ 11,536 | $ 11,394 | $ 11,098 | $ 11,399 | $ 11,348 | $ 11,391 | $ 10,864 | $ 10,907 | $ 10,694 | $ 10,778 | $ 10,091 | $ 10,100 | $ 10,742 | $ 10,930 | $ 10,872 | $ 10,031 | $ 10,317 | $ 10,999 | $ 10,663 | $ 10,828 | $ 10,659 | $ 10,635 | $ 10,733 | $ 10,059 | $ 10,221 | $ 10,298 | $ 10,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 120 Months Ended |
| Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2024 | |
| C000014303 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Tax-Managed Multi-Cap Growth Portfolio | ||
| Without Sales Load [Member] | C000014303 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 34.79% | 14.27% | 12.64% |
| EATON VANCE Index: S&P 500 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | ®</sup> Index " id="sjs-B11" xml:space="preserve">S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup> Index | ||
| Average Annual Return, Percent | 38.02% | 15.25% | 12.99% |
| EATON VANCE Index: Russell 3000® Growth Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | ®</sup> Growth Index" id="sjs-B15">Russell 3000<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup> Growth Index | ||
| Average Annual Return, Percent | 43.42% | 18.31% | 15.65% |
| Shareholder Report, Holdings (Details) - C000014303 | Oct. 31, 2024 |
| FR_594918104 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| FR_037833100 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| FR_023135106 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| FR_67066G104 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| FR_02079K107 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| FR_02079K305 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| FR_30303M102 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.20% |
| FR_92826C839 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.10% |
| FR_79466L302 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| FR_380237107 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.70% |
| SectorReal Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| SectorShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| SectorMaterials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| SectorConsumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| SectorFinancials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| SectorHealth Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| SectorIndustrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.10% |
| SectorConsumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.40% |
| SectorCommunication Services | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.30% |
| SectorInformation Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.70% |
