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Shareholder Report
 6 Months Ended
Sep. 30, 2025
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity Magellan Fund
Entity Central Index Key 0000061397
Entity Investment Company Type N-1A
Document Period End Date Sep. 30, 2025
Fidelity Magellan K6 Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Magellan® K6 Fund
Class Name Fidelity® Magellan® K6 Fund
Trading Symbol FMKFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Magellan® K6 Fund for the period April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-835-5092
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Magellan® K6 Fund 
$ 25 
0.45%
  
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.45%
Net Assets $ 353,105,897
Holdings Count | shares 52
Investment Company Portfolio Turnover 51.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of September 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$353,105,897
  
Number of Holdings
52
  
Portfolio Turnover
51%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.3   Industrials 19.8   Financials 15.4   Consumer Discretionary 13.5   Communication Services 6.8   Materials 2.9   Health Care 2.6   Consumer Staples 1.7     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.0                       Short-Term Investments and Net Other Assets (Liabilities) - 1.0   United States 95.9 Taiwan 1.7 Brazil 1.2 Canada 1.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 95.9                       Taiwan - 1.7                               Brazil - 1.2                               Canada - 1.2                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 9.9   Microsoft Corp 8.8   Amazon.com Inc 5.4   Meta Platforms Inc Class A 4.6   Broadcom Inc 4.6   Visa Inc Class A 2.2   Netflix Inc 2.2   GE Aerospace 2.2   Mastercard Inc Class A 2.0   Amphenol Corp Class A 2.0     43.9  
Fidelity Magellan Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Magellan® Fund
Class Name Fidelity® Magellan® Fund
Trading Symbol FMAGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Magellan® Fund for the period April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Magellan® Fund 
$ 40 
0.73%
  
Expenses Paid, Amount $ 40
Expense Ratio, Percent 0.73%
Net Assets $ 38,579,101,205
Holdings Count | shares 52
Investment Company Portfolio Turnover 45.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of September 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$38,579,101,205
  
Number of Holdings
52
  
Portfolio Turnover
45%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.4   Industrials 19.7   Financials 15.4   Consumer Discretionary 13.4   Communication Services 6.8   Materials 2.9   Health Care 2.6   Consumer Staples 1.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.0                       Short-Term Investments and Net Other Assets (Liabilities) - 1.0   United States 96.0 Taiwan 1.7 Brazil 1.2 Canada 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 96.0                       Taiwan - 1.7                               Brazil - 1.2                               Canada - 1.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 10.0   Microsoft Corp 8.8   Amazon.com Inc 5.4   Meta Platforms Inc Class A 4.6   Broadcom Inc 4.6   Visa Inc Class A 2.2   Netflix Inc 2.2   GE Aerospace 2.1   Mastercard Inc Class A 2.0   Amphenol Corp Class A 2.0     43.9  
Fidelity Magellan Fund - Class K  
Shareholder Report [Line Items]  
Fund Name Fidelity® Magellan® Fund
Class Name Fidelity® Magellan® Fund Class K
Trading Symbol FMGKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Magellan® Fund for the period April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-835-5092
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class K 
$ 37 
0.66%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.66%
Net Assets $ 38,579,101,205
Holdings Count | shares 52
Investment Company Portfolio Turnover 45.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of September 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$38,579,101,205
  
Number of Holdings
52
  
Portfolio Turnover
45%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.4   Industrials 19.7   Financials 15.4   Consumer Discretionary 13.4   Communication Services 6.8   Materials 2.9   Health Care 2.6   Consumer Staples 1.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.0                       Short-Term Investments and Net Other Assets (Liabilities) - 1.0   United States 96.0 Taiwan 1.7 Brazil 1.2 Canada 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 96.0                       Taiwan - 1.7                               Brazil - 1.2                               Canada - 1.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 10.0   Microsoft Corp 8.8   Amazon.com Inc 5.4   Meta Platforms Inc Class A 4.6   Broadcom Inc 4.6   Visa Inc Class A 2.2   Netflix Inc 2.2   GE Aerospace 2.1   Mastercard Inc Class A 2.0   Amphenol Corp Class A 2.0     43.9  
Fidelity Advisor Magellan Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity® Magellan® Fund
Class Name Fidelity Advisor® Magellan Fund Class A
Trading Symbol FMAEX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Magellan® Fund for the period April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 56 
1.02%
  
Expenses Paid, Amount $ 56
Expense Ratio, Percent 1.02%
Net Assets $ 38,579,101,205
Holdings Count | shares 52
Investment Company Portfolio Turnover 45.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of September 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$38,579,101,205
  
Number of Holdings
52
  
Portfolio Turnover
45%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.4   Industrials 19.7   Financials 15.4   Consumer Discretionary 13.4   Communication Services 6.8   Materials 2.9   Health Care 2.6   Consumer Staples 1.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.0                       Short-Term Investments and Net Other Assets (Liabilities) - 1.0   United States 96.0 Taiwan 1.7 Brazil 1.2 Canada 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 96.0                       Taiwan - 1.7                               Brazil - 1.2                               Canada - 1.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 10.0   Microsoft Corp 8.8   Amazon.com Inc 5.4   Meta Platforms Inc Class A 4.6   Broadcom Inc 4.6   Visa Inc Class A 2.2   Netflix Inc 2.2   GE Aerospace 2.1   Mastercard Inc Class A 2.0   Amphenol Corp Class A 2.0     43.9  
Fidelity Advisor Magellan Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity® Magellan® Fund
Class Name Fidelity Advisor® Magellan Fund Class M
Trading Symbol FMAJX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Magellan® Fund for the period April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 70 
1.27%
  
Expenses Paid, Amount $ 70
Expense Ratio, Percent 1.27%
Net Assets $ 38,579,101,205
Holdings Count | shares 52
Investment Company Portfolio Turnover 45.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of September 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$38,579,101,205
  
Number of Holdings
52
  
Portfolio Turnover
45%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.4   Industrials 19.7   Financials 15.4   Consumer Discretionary 13.4   Communication Services 6.8   Materials 2.9   Health Care 2.6   Consumer Staples 1.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.0                       Short-Term Investments and Net Other Assets (Liabilities) - 1.0   United States 96.0 Taiwan 1.7 Brazil 1.2 Canada 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 96.0                       Taiwan - 1.7                               Brazil - 1.2                               Canada - 1.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 10.0   Microsoft Corp 8.8   Amazon.com Inc 5.4   Meta Platforms Inc Class A 4.6   Broadcom Inc 4.6   Visa Inc Class A 2.2   Netflix Inc 2.2   GE Aerospace 2.1   Mastercard Inc Class A 2.0   Amphenol Corp Class A 2.0     43.9  
Fidelity Advisor Magellan Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity® Magellan® Fund
Class Name Fidelity Advisor® Magellan Fund Class C
Trading Symbol FMANX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Magellan® Fund for the period April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 98 
1.77%
  
Expenses Paid, Amount $ 98
Expense Ratio, Percent 1.77%
Net Assets $ 38,579,101,205
Holdings Count | shares 52
Investment Company Portfolio Turnover 45.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of September 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$38,579,101,205
  
Number of Holdings
52
  
Portfolio Turnover
45%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.4   Industrials 19.7   Financials 15.4   Consumer Discretionary 13.4   Communication Services 6.8   Materials 2.9   Health Care 2.6   Consumer Staples 1.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.0                       Short-Term Investments and Net Other Assets (Liabilities) - 1.0   United States 96.0 Taiwan 1.7 Brazil 1.2 Canada 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 96.0                       Taiwan - 1.7                               Brazil - 1.2                               Canada - 1.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 10.0   Microsoft Corp 8.8   Amazon.com Inc 5.4   Meta Platforms Inc Class A 4.6   Broadcom Inc 4.6   Visa Inc Class A 2.2   Netflix Inc 2.2   GE Aerospace 2.1   Mastercard Inc Class A 2.0   Amphenol Corp Class A 2.0     43.9  
Fidelity Advisor Magellan Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity® Magellan® Fund
Class Name Fidelity Advisor® Magellan Fund Class I
Trading Symbol FMAOX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Magellan® Fund for the period April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 42 
0.77%
  
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.77%
Net Assets $ 38,579,101,205
Holdings Count | shares 52
Investment Company Portfolio Turnover 45.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of September 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$38,579,101,205
  
Number of Holdings
52
  
Portfolio Turnover
45%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.4   Industrials 19.7   Financials 15.4   Consumer Discretionary 13.4   Communication Services 6.8   Materials 2.9   Health Care 2.6   Consumer Staples 1.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.0                       Short-Term Investments and Net Other Assets (Liabilities) - 1.0   United States 96.0 Taiwan 1.7 Brazil 1.2 Canada 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 96.0                       Taiwan - 1.7                               Brazil - 1.2                               Canada - 1.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 10.0   Microsoft Corp 8.8   Amazon.com Inc 5.4   Meta Platforms Inc Class A 4.6   Broadcom Inc 4.6   Visa Inc Class A 2.2   Netflix Inc 2.2   GE Aerospace 2.1   Mastercard Inc Class A 2.0   Amphenol Corp Class A 2.0     43.9  
Fidelity Advisor Magellan Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity® Magellan® Fund
Class Name Fidelity Advisor® Magellan Fund Class Z
Trading Symbol FMASX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Magellan® Fund for the period April 1, 2025 to September 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class Z 
$ 37 
0.66%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.66%
Net Assets $ 38,579,101,205
Holdings Count | shares 52
Investment Company Portfolio Turnover 45.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of September 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$38,579,101,205
  
Number of Holdings
52
  
Portfolio Turnover
45%
  
Holdings [Text Block]       MARKET SECTORS (% of Fund's net assets)     Information Technology 36.4   Industrials 19.7   Financials 15.4   Consumer Discretionary 13.4   Communication Services 6.8   Materials 2.9   Health Care 2.6   Consumer Staples 1.8     Common Stocks 99.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 99.0                       Short-Term Investments and Net Other Assets (Liabilities) - 1.0   United States 96.0 Taiwan 1.7 Brazil 1.2 Canada 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 96.0                       Taiwan - 1.7                               Brazil - 1.2                               Canada - 1.1                                  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     NVIDIA Corp 10.0   Microsoft Corp 8.8   Amazon.com Inc 5.4   Meta Platforms Inc Class A 4.6   Broadcom Inc 4.6   Visa Inc Class A 2.2   Netflix Inc 2.2   GE Aerospace 2.1   Mastercard Inc Class A 2.0   Amphenol Corp Class A 2.0     43.9