Risk/Return Detail Data - FidelitySAIManagedFuturesFund-PRO |
May 23, 2025
USD ($)
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| FidelitySAIMergerArbitrageFund-PRO | Fidelity SAI Merger Arbitrage Fund | Fidelity SAI Merger Arbitrage Fund | ||||||||||
| Prospectus Line Items | ||||||||||
| Management Fees (as a percentage of Assets) | 1.05% | |||||||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||||||
| Other Expenses (as a percentage of Assets): | 0.18% | [1] | ||||||||
| Expenses (as a percentage of Assets) | 1.23% | |||||||||
| Fee Waiver or Reimbursement | (0.13%) | [2] | ||||||||
| Net Expenses (as a percentage of Assets) | 1.10% | |||||||||
| Expense Example, with Redemption, 1 Year | $ 112 | |||||||||
| Expense Example, with Redemption, 3 Years | $ 377 | |||||||||
| FidelitySAIMergerArbitrageFund-PRO | Fidelity SAI Merger Arbitrage Fund | ||||||||||
| Prospectus Line Items | ||||||||||
| Risk/Return [Heading] | Fund Summary Fund: Fidelity® SAI Merger Arbitrage Fund | |||||||||
| Objective [Heading] | Investment Objective | |||||||||
| Objective, Primary [Text Block] | Fidelity® SAI Merger Arbitrage Fund seeks capital appreciation. | |||||||||
| Expense Heading [Optional Text] | 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. | |||||||||
| Shareholder Fees Caption [Optional Text] | Shareholder fees | |||||||||
| Shareholder Fee, Other | $ 0 | |||||||||
| Operating Expenses Caption [Optional Text] | Annual Operating Expenses | |||||||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | May 31, 2026 | |||||||||
| 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. | |||||||||
| Other Expenses, New Fund, Based on Estimates [Text] | Based on estimated amounts for the current fiscal year. | |||||||||
| 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] | Employing a merger arbitrage strategy that seeks to generate returns from discrepancies in asset pricing before and after merger or reorganization events. Normally investing the fund's assets in equity securities and equity related derivative instruments, including special purpose acquisition vehicles ("SPACs"), of companies that are or may be involved in publicly announced or reported merger or re-organization events (including pre-definitive and definitive takeovers, buyouts, liquidations, corporate simplifications, spin offs, and other similar corporate transactions and reorganizations), including stock-for-stock, cash, and mixed consideration mergers and acquisitions ("a Merger Transaction"), or companies that the Adviser believes may be involved in Merger Transactions. Utilizing other types of securities such as debt securities (including unrated debt securities and lower-quality debt securities of less than investment grade-quality, also referred to as high yield debt securities or junk bonds), convertible securities (including synthetic convertible securities), and options to employ merger arbitrage strategies. Investing both long and short in equities directly and through the use of derivatives (options, swap agreements and other derivative instruments). Investing in securities of domestic and foreign issuers. Using fundamental analysis of factors such as each issuer's financial condition, industry position, likelihood of merger completion, timeline to completion as well as market and economic conditions to select investments. Engaging in transactions that may have a leveraging effect on the fund, including: directional (long and short) investments in derivatives - such as swaps, forward contracts, futures, and options - to seek to hedge risks such as event completion and time-to-close event risk; for efficient portfolio management; or to enhance the returns of the fund. The Adviser may invest in U.S. Government securities, short-term investment funds, ETFs, other fixed income instruments, cash, and cash equivalents for investment purposes and to maintain collateral to cover derivatives positions. | |||||||||
| Bar Chart and Performance Table [Heading] | Performance | |||||||||
| Performance Narrative [Text Block] | Performance history will be available for the fund after the fund has been in operation for one calendar year. | |||||||||
| Performance One Year or Less [Text] | Performance history will be available for the fund after the fund has been in operation for one calendar year. | |||||||||
| FidelitySAIManagedFuturesFund-PRO | Fidelity SAI Managed Futures Fund | Fidelity SAI Managed Futures Fund | ||||||||||
| Prospectus Line Items | ||||||||||
| Management Fees (as a percentage of Assets) | 1.00% | |||||||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||||||
| Other Expenses (as a percentage of Assets): | 0.17% | [3] | ||||||||
| Expenses (as a percentage of Assets) | 1.17% | |||||||||
| Fee Waiver or Reimbursement | (0.12%) | [4] | ||||||||
| Net Expenses (as a percentage of Assets) | 1.05% | |||||||||
| Expense Example, with Redemption, 1 Year | $ 107 | |||||||||
| Expense Example, with Redemption, 3 Years | $ 360 | |||||||||
| FidelitySAIManagedFuturesFund-PRO | Fidelity SAI Managed Futures Fund | ||||||||||
| Prospectus Line Items | ||||||||||
| Risk/Return [Heading] | Fund Summary Fund: Fidelity® SAI Managed Futures Fund | |||||||||
| Objective [Heading] | Investment Objective | |||||||||
| Objective, Primary [Text Block] | Fidelity® SAI Managed Futures Fund seeks capital appreciation. | |||||||||
| Expense Heading [Optional Text] | 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. | |||||||||
| Shareholder Fees Caption [Optional Text] | Shareholder fees | |||||||||
| Shareholder Fee, Other | $ 0 | |||||||||
| Operating Expenses Caption [Optional Text] | Annual Operating Expenses | |||||||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | May 31, 2026 | |||||||||
| 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. | |||||||||
| Other Expenses, New Fund, Based on Estimates [Text] | Based on estimated amounts for the current fiscal year. | |||||||||
| 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] | Seeking to achieve its investment objective by pursuing a strategy intended to capture the persistence of price trends (up and/or down) observed across equity, fixed income, currency and commodity markets. The fund's investment strategy utilizes a combination of equity, fixed income, currency and commodity derivatives, as well as certain direct investments, to provide exposure to these markets and price trends. Trend following strategies attempt to capture trends in price movements in the markets they allocate to, generally taking long positions when prices move upwards, and taking short positions when they move downwards. The Adviser may also utilize non-trend factor strategies, which focus on quantitative analysis of fundamental, non-price data (e.g., carry, volatility) to achieve the fund's investment objective. Executing the fund's strategy through investments in derivative instruments that may have a leveraging effect on the fund, including futures (such as equity index futures, commodity futures, and currency futures), options on futures, options, swaps (including excess return swaps and total return swaps) and other derivative instruments. The fund may have long/short exposure via these instruments. In addition to creating and/or adjusting the fund's investment exposure, the fund's strategy may also be used to enhance total return, to hedge risks, to manage certain investment risk, and/or to manage volatility. Employing various proprietary quantitative measures and qualitative techniques to evaluate price trends and non-trend factors across the asset classes in which the fund invests. The fund's quantitative measures are developed and maintained by the Adviser and are subject to change over time without notice in the Adviser's discretion. The Adviser retains discretion over the target asset allocations, which may include positions that differ from the target allocations indicated by the quantitative measures. Investing up to 25% of assets in Fidelity SAI Managed Futures Cayman Ltd., a wholly-owned subsidiary organized under the laws of the Cayman Islands that invests in commodity-linked derivatives and related collateral (cash or cash equivalent investments, short-term investment funds and/or U.S. Government securities), commodity-related exchange-traded funds (ETFs), and commodity-related exchange-traded notes (ETNs). Investing a significant portion of the fund's assets in U.S. Government securities, short-term investment funds, cash, and cash equivalents for investment purposes and to maintain collateral to cover derivatives positions. | |||||||||
| Bar Chart and Performance Table [Heading] | Performance | |||||||||
| Performance Narrative [Text Block] | Performance history will be available for the fund after the fund has been in operation for one calendar year. | |||||||||
| Performance One Year or Less [Text] | Performance history will be available for the fund after the fund has been in operation for one calendar year. | |||||||||
| Document Type | 485BPOS | |||||||||
| Registrant Name | Fidelity Greenwood Street Trust | |||||||||
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