| Form N-CSR Cover | 6 Months Ended |
| Nov. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Franklin Alternative Strategies Funds |
| Entity Central Index Key | 0001535538 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Nov. 30, 2024 |
| Shareholder Report | 6 Months Ended | |
| Nov. 30, 2024 USD ($) $ / shares | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | Franklin Alternative Strategies Funds | |
| Entity Central Index Key | 0001535538 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Nov. 30, 2024 | |
| Class A | ||
| Shareholder Report [Line Items] | ||
| Fund Name | K2 Alternative Strategies Fund | |
| Class Name | Class A | |
| Trading Symbol | FAAAX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about K2 Alternative Strategies Fund for the period June 1, 2024, to November 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) DIAL BEN/342-5236 . | |
| Additional Information Phone Number | (800) DIAL BEN/342-5236 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * , † Class A $122 2.40% | [1],[2] |
| Expenses Paid, Amount | $ 122 | |
| Expense Ratio, Percent | 2.40% | |
| Net Assets | $ 570,657,731 | |
| Holdings Count | $ / shares | 720 | [3] |
| Investment Company Portfolio Turnover | 113.74% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Total Net Assets $570,657,731 Total Number of Portfolio Holdings * 720 Portfolio Turnover Rate 113.74% | [3] |
| Holdings [Text Block] | Strategy Allocation (% of Total Net Assets) Long Positions Short Positions Long Short Equity 48.2 -31.2 Relative Value 49.2 -33.6 Event Driven 3.3 -2.0 Global Macro 117.9 -101.1 Strategic Overlay 2.4 -- Total 221.0 -167.9 | [4] |
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class C | ||
| Shareholder Report [Line Items] | ||
| Fund Name | K2 Alternative Strategies Fund | |
| Class Name | Class C | |
| Trading Symbol | FASCX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about K2 Alternative Strategies Fund for the period June 1, 2024, to November 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) DIAL BEN/342-5236 . | |
| Additional Information Phone Number | (800) DIAL BEN/342-5236 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * , † Class C $161 3.16% | [5],[6] |
| Expenses Paid, Amount | $ 161 | |
| Expense Ratio, Percent | 3.16% | |
| Net Assets | $ 570,657,731 | |
| Holdings Count | $ / shares | 720 | [7] |
| Investment Company Portfolio Turnover | 113.74% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Total Net Assets $570,657,731 Total Number of Portfolio Holdings * 720 Portfolio Turnover Rate 113.74% | [7] |
| Holdings [Text Block] | Strategy Allocation (% of Total Net Assets) Long Positions Short Positions Long Short Equity 48.2 -31.2 Relative Value 49.2 -33.6 Event Driven 3.3 -2.0 Global Macro 117.9 -101.1 Strategic Overlay 2.4 -- Total 221.0 -167.9 | [8] |
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class R | ||
| Shareholder Report [Line Items] | ||
| Fund Name | K2 Alternative Strategies Fund | |
| Class Name | Class R | |
| Trading Symbol | FSKKX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about K2 Alternative Strategies Fund for the period June 1, 2024, to November 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) DIAL BEN/342-5236 . | |
| Additional Information Phone Number | (800) DIAL BEN/342-5236 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * , † Class R $135 2.65% | [9],[10] |
| Expenses Paid, Amount | $ 135 | |
| Expense Ratio, Percent | 2.65% | |
| Net Assets | $ 570,657,731 | |
| Holdings Count | $ / shares | 720 | [11] |
| Investment Company Portfolio Turnover | 113.74% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Total Net Assets $570,657,731 Total Number of Portfolio Holdings * 720 Portfolio Turnover Rate 113.74% | [11] |
| Holdings [Text Block] | Strategy Allocation (% of Total Net Assets) Long Positions Short Positions Long Short Equity 48.2 -31.2 Relative Value 49.2 -33.6 Event Driven 3.3 -2.0 Global Macro 117.9 -101.1 Strategic Overlay 2.4 -- Total 221.0 -167.9 | [12] |
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Class R6 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | K2 Alternative Strategies Fund | |
| Class Name | Class R6 | |
| Trading Symbol | FASRX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about K2 Alternative Strategies Fund for the period June 1, 2024, to November 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) DIAL BEN/342-5236 . | |
| Additional Information Phone Number | (800) DIAL BEN/342-5236 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * , † Class R6 $108 2.12% | [13],[14] |
| Expenses Paid, Amount | $ 108 | |
| Expense Ratio, Percent | 2.12% | |
| Net Assets | $ 570,657,731 | |
| Holdings Count | $ / shares | 720 | [15] |
| Investment Company Portfolio Turnover | 113.74% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Total Net Assets $570,657,731 Total Number of Portfolio Holdings * 720 Portfolio Turnover Rate 113.74% | [15] |
| Holdings [Text Block] | Strategy Allocation (% of Total Net Assets) Long Positions Short Positions Long Short Equity 48.2 -31.2 Relative Value 49.2 -33.6 Event Driven 3.3 -2.0 Global Macro 117.9 -101.1 Strategic Overlay 2.4 -- Total 221.0 -167.9 | [16] |
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| Advisor Class | ||
| Shareholder Report [Line Items] | ||
| Fund Name | K2 Alternative Strategies Fund | |
| Class Name | Advisor Class | |
| Trading Symbol | FABZX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about K2 Alternative Strategies Fund for the period June 1, 2024, to November 30, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents . You can also request this information by contacting us at (800) DIAL BEN/342-5236 . | |
| Additional Information Phone Number | (800) DIAL BEN/342-5236 | |
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment * , † Advisor Class $110 2.16% | [17],[18] |
| Expenses Paid, Amount | $ 110 | |
| Expense Ratio, Percent | 2.16% | |
| Net Assets | $ 570,657,731 | |
| Holdings Count | $ / shares | 720 | [19] |
| Investment Company Portfolio Turnover | 113.74% | |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of November 30, 2024) Total Net Assets $570,657,731 Total Number of Portfolio Holdings * 720 Portfolio Turnover Rate 113.74% | [19] |
| Holdings [Text Block] | Strategy Allocation (% of Total Net Assets) Long Positions Short Positions Long Short Equity 48.2 -31.2 Relative Value 49.2 -33.6 Event Driven 3.3 -2.0 Global Macro 117.9 -101.1 Strategic Overlay 2.4 -- Total 221.0 -167.9 | [20] |
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documents | |
| [1] * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. Figures include the effect of gross notional exposure of derivatives. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. Figures include the effect of gross notional exposure of derivatives. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. Figures include the effect of gross notional exposure of derivatives. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. Figures include the effect of gross notional exposure of derivatives. * Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher. † Annualized. * Does not include derivatives, except purchased options, if any. Figures include the effect of gross notional exposure of derivatives. | ||
| Label | Element | Value |
| Class A | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 221% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (167.90%) |
| Class A | Long Short Equity [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 48.20% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (31.20%) |
| Class A | Relative Value [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 49.20% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (33.60%) |
| Class A | Event Driven [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 3.30% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (2.00%) |
| Class A | Global Macro [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 117.90% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (101.10%) |
| Class A | Strategic Overlay [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 2.40% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | 0% |
| Label | Element | Value |
| Class C | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 221% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (167.90%) |
| Class C | Long Short Equity [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 48.20% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (31.20%) |
| Class C | Relative Value [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 49.20% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (33.60%) |
| Class C | Event Driven [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 3.30% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (2.00%) |
| Class C | Global Macro [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 117.90% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (101.10%) |
| Class C | Strategic Overlay [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 2.40% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | 0% |
| Label | Element | Value |
| Class R | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 221% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (167.90%) |
| Class R | Long Short Equity [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 48.20% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (31.20%) |
| Class R | Relative Value [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 49.20% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (33.60%) |
| Class R | Event Driven [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 3.30% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (2.00%) |
| Class R | Global Macro [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 117.90% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (101.10%) |
| Class R | Strategic Overlay [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 2.40% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | 0% |
| Label | Element | Value |
| Class R6 | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 221% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (167.90%) |
| Class R6 | Long Short Equity [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 48.20% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (31.20%) |
| Class R6 | Relative Value [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 49.20% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (33.60%) |
| Class R6 | Event Driven [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 3.30% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (2.00%) |
| Class R6 | Global Macro [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 117.90% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (101.10%) |
| Class R6 | Strategic Overlay [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 2.40% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | 0% |
| Label | Element | Value |
| Advisor Class | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 221% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (167.90%) |
| Advisor Class | Long Short Equity [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 48.20% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (31.20%) |
| Advisor Class | Relative Value [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 49.20% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (33.60%) |
| Advisor Class | Event Driven [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 3.30% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (2.00%) |
| Advisor Class | Global Macro [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 117.90% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | (101.10%) |
| Advisor Class | Strategic Overlay [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Net Long Exposure | oef_PctOfNetLongExposure | 2.40% |
| Percent of Net Short Exposure | oef_PctOfNetShortExposure | 0% |
