Risk/Return Detail Data - FidelityNewMillenniumFund-RetailPRO |
Jan. 29, 2025
USD ($)
|
|||||
|---|---|---|---|---|---|---|
| Risk/Return: | ||||||
| Registrant Name | Fidelity Mt. Vernon Street Trust | |||||
| FidelityNewMillenniumFund-RetailPRO | Fidelity New Millennium Fund | ||||||
| Risk/Return: | ||||||
| Risk/Return [Heading] | Fund Summary Fund: Fidelity® New Millennium Fund® | |||||
| Objective [Heading] | Investment Objective | |||||
| Objective, Primary [Text Block] | Fidelity® New Millennium Fund® seeks capital appreciation. | |||||
| Expense [Heading] | Fee Table | |||||
| Expense Narrative [Text Block] | The following table describes the fees and expenses that may be incurred when you buy, hold, and sell shares of the fund. You may pay other fees , such as brokerage commissions, which are not reflected in the tables and examples below. | |||||
| Shareholder Fees Caption [Text] | Shareholder fees | |||||
| (fees paid directly from your investment) | none | |||||
| Operating Expenses Caption [Text] | Annual Operating Expenses | |||||
| Portfolio Turnover [Heading] | Portfolio Turnover | |||||
| Portfolio Turnover [Text Block] | The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual operating expenses or in the example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 44 % of the average value of its portfolio. | |||||
| Portfolio Turnover, Rate | 44.00% | |||||
| Expenses Restated to Reflect Current [Text] | Adjusted to reflect current fees . | |||||
| Expense Example Narrative [Text Block] | This example helps compare the cost of investing in the fund with the cost of investing in other funds. Let's say, hypothetically, that the annual return for shares of the fund is 5% and that the fees and the annual operating expenses for shares of the fund are exactly as described in the fee table. This example illustrates the effect of fees and expenses, but is not meant to suggest actual or expected fees and expenses or returns, all of which may vary. For every $10,000 you invested, here's how much you would pay in total expenses if you sell all of your shares at the end of each time period indicated: | |||||
| Strategy [Heading] | Principal Investment Strategies | |||||
| Strategy Narrative [Text Block] | Normally investing primarily in common stocks. Identifying early signs of long-term changes in the marketplace and focusing on those companies that may benefit from opportunities created by these changes by examining technological advances, product innovation, economic plans, demographics, social attitudes, and other factors, which can lead to investments in small and medium-sized companies. Investing in domestic and foreign issuers. Investing in either "growth" stocks or "value" stocks or both. Using fundamental analysis of factors such as each issuer's financial condition and industry position, as well as market and economic conditions, to select investments. | |||||
| Risk [Heading] | Principal Investment Risks | |||||
| Bar Chart and Performance Table [Heading] | Performance | |||||
| Performance Narrative [Text Block] | The following information is intended to help you understand the risks of investing in the fund. The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. The index description appears in the "Additional Index Information" section of the prospectus. Past performance (before and after taxes) is not an indication of future performance. Visit www.fidelity.com for more recent performance information. | |||||
| Performance Information Illustrates Variability of Returns [Text] | The information illustrates the changes in the performance of the fund's shares from year to year and compares the performance of the fund's shares to the performance of a securities market index over various periods of time. | |||||
| Performance Availability Website Address [Text] | www.fidelity.com | |||||
| Performance Past Does Not Indicate Future [Text] | Past performance (before and after taxes) is not an indication of future performance. | |||||
| Bar Chart [Heading] | Year-by-Year Returns | |||||
| Highest Quarterly Return, Label | Highest Quarter Return | |||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | |||||
| Highest Quarterly Return | 19.60% | |||||
| Lowest Quarterly Return, Label | Lowest Quarter Return | |||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | |||||
| Lowest Quarterly Return | (27.69%) | |||||
| Performance Table Heading | Average Annual Returns | |||||
| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. | |||||
| Performance Table Not Relevant to Tax Deferred | The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). | |||||
| Performance Table Explanation after Tax Higher | Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. | |||||
| Performance Table Narrative | After-tax returns are calculated using the historical highest individual federal marginal income tax rates, but do not reflect the impact of state or local taxes. Actual after-tax returns may differ depending on your individual circumstances. The after-tax returns shown are not relevant if you hold your shares in a retirement account or in another tax-deferred arrangement, such as an employee benefit plan (profit sharing, 401(k), or 403(b) plan). Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of fund shares. | |||||
| FidelityNewMillenniumFund-RetailPRO | Fidelity New Millennium Fund | Fidelity New Millennium Fund | ||||||
| Risk/Return: | ||||||
| Management fee | 0.76% | [1],[2] | ||||
| Distribution and/or Service (12b-1) fees | none | |||||
| Other expenses | none | [2] | ||||
| Total annual operating expenses | 0.76% | |||||
| 1 year | $ 78 | |||||
| 3 years | 243 | |||||
| 5 years | 422 | |||||
| 10 years | $ 942 | |||||
| 2015 | (3.17%) | |||||
| 2016 | 14.92% | |||||
| 2017 | 20.06% | |||||
| 2018 | (7.01%) | |||||
| 2019 | 26.16% | |||||
| 2020 | 5.76% | |||||
| 2021 | 23.91% | |||||
| 2022 | (1.56%) | |||||
| 2023 | 25.35% | |||||
| 2024 | 28.83% | |||||
| FidelityNewMillenniumFund-RetailPRO | Fidelity New Millennium Fund | Return Before Taxes | Fidelity New Millennium Fund | ||||||
| Risk/Return: | ||||||
| Label | Return Before Taxes | |||||
| Past 1 year | 28.83% | |||||
| Past 5 years | 15.81% | |||||
| Past 10 years | 12.56% | |||||
| FidelityNewMillenniumFund-RetailPRO | Fidelity New Millennium Fund | After Taxes on Distributions | Fidelity New Millennium Fund | ||||||
| Risk/Return: | ||||||
| Label | Return After Taxes on Distributions | |||||
| Past 1 year | 27.73% | |||||
| Past 5 years | 14.32% | |||||
| Past 10 years | 10.60% | |||||
| FidelityNewMillenniumFund-RetailPRO | Fidelity New Millennium Fund | After Taxes on Distributions and Sales | Fidelity New Millennium Fund | ||||||
| Risk/Return: | ||||||
| Label | Return After Taxes on Distributions and Sale of Fund Shares | |||||
| Past 1 year | 17.81% | |||||
| Past 5 years | 12.35% | |||||
| Past 10 years | 9.64% | |||||
| FidelityNewMillenniumFund-RetailPRO | Fidelity New Millennium Fund | SP001 | ||||||
| Risk/Return: | ||||||
| Label | S&P 500® Index | |||||
| Past 1 year | 25.02% | |||||
| Past 5 years | 14.53% | |||||
| Past 10 years | 13.10% | |||||
| ||||||