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Shareholder Report
 6 Months Ended
Sep. 30, 2024
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, 2024
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, 2024 to September 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 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 
$ 24 
0.45%
  
Expenses Paid, Amount $ 24
Expense Ratio, Percent 0.45%
Net Assets $ 316,096,186
Holdings Count | shares 60
Investment Company Portfolio Turnover 45.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of September 30, 2024)
 
KEY FACTS 
  
  
Fund Size
$316,096,186
 
  
Number of Holdings
60
 
  
Portfolio Turnover
45%
 
  
Holdings [Text Block]   MARKET SECTORS (% of Fund's net assets)     Information Technology 33.8   Industrials 18.0   Health Care 12.2   Financials 10.6   Consumer Discretionary 9.4   Communication Services 8.6   Materials 5.0   Consumer Staples 1.9     Common Stocks 99.5 Short-Term Investments and Net Other Assets (Liabilities) 0.5 ASSET ALLOCATION (% of Fund's net assets) United States 97.8 Canada 1.2 Denmark 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Microsoft Corp 7.8     NVIDIA Corp 7.2     Amazon.com Inc 4.6     Meta Platforms Inc Class A 3.9     Alphabet Inc Class A 3.1     Broadcom Inc 3.0     Eli Lilly & Co 2.5     UnitedHealth Group Inc 2.3     Mastercard Inc Class A 2.1     Visa Inc Class A 2.0       38.5  
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, 2024 to September 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 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 
$ 30 
0.57%
  
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.57%
Net Assets $ 36,278,252,982
Holdings Count | shares 63
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of September 30, 2024)
 
KEY FACTS 
  
  
Fund Size
$36,278,252,982
 
  
Number of Holdings
63
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   MARKET SECTORS (% of Fund's net assets)     Information Technology 33.8   Industrials 17.9   Health Care 12.2   Financials 10.6   Consumer Discretionary 9.4   Communication Services 8.6   Materials 5.0   Consumer Staples 1.9     Common Stocks 99.4 Short-Term Investments and Net Other Assets (Liabilities) 0.6 ASSET ALLOCATION (% of Fund's net assets) United States 97.8 Canada 1.2 Denmark 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Microsoft Corp 7.8     NVIDIA Corp 7.2     Amazon.com Inc 4.6     Meta Platforms Inc Class A 3.9     Alphabet Inc Class A 3.1     Broadcom Inc 3.0     Eli Lilly & Co 2.5     UnitedHealth Group Inc 2.3     Mastercard Inc Class A 2.1     Visa Inc Class A 2.0       38.5  
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, 2024 to September 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 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 
$ 26 
0.50%
  
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.50%
Net Assets $ 36,278,252,982
Holdings Count | shares 63
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block] Key Fund Statistics  
(as of September 30, 2024)
 
KEY FACTS 
  
  
Fund Size
$36,278,252,982
 
  
Number of Holdings
63
 
  
Portfolio Turnover
39%
 
  
Holdings [Text Block]   MARKET SECTORS (% of Fund's net assets)     Information Technology 33.8   Industrials 17.9   Health Care 12.2   Financials 10.6   Consumer Discretionary 9.4   Communication Services 8.6   Materials 5.0   Consumer Staples 1.9     Common Stocks 99.4 Short-Term Investments and Net Other Assets (Liabilities) 0.6 ASSET ALLOCATION (% of Fund's net assets) United States 97.8 Canada 1.2 Denmark 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Microsoft Corp 7.8     NVIDIA Corp 7.2     Amazon.com Inc 4.6     Meta Platforms Inc Class A 3.9     Alphabet Inc Class A 3.1     Broadcom Inc 3.0     Eli Lilly & Co 2.5     UnitedHealth Group Inc 2.3     Mastercard Inc Class A 2.1     Visa Inc Class A 2.0       38.5