| Form N-CSR Cover | 6 Months Ended |
| Jun. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Fidelity Contrafund |
| Entity Central Index Key | 0000024238 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jun. 30, 2024 |
| Shareholder Report | 6 Months Ended |
| Jun. 30, 2024 USD ($) shares | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Fidelity Contrafund |
| Entity Central Index Key | 0000024238 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jun. 30, 2024 |
| Fidelity Series Opportunistic Insights Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Series Opportunistic Insights Fund |
| Class Name | Fidelity® Series Opportunistic Insights Fund |
| Trading Symbol | FVWSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Series Opportunistic Insights Fund for the period January 1, 2024 to June 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. |
| Additional Information Phone Number | 1-800-544-8544 |
| 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® Series Opportunistic Insights Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 10,875,480,742 |
| Holdings Count | shares | 354 |
| Investment Company Portfolio Turnover | 19% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of June 30, 2024) KEY FACTS Fund Size $ Number of Holdings 354 Portfolio Turnover 19 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 27.9 Communication Services 19.8 Financials 13.8 Health Care 12.4 Consumer Discretionary 10.5 Industrials 8.8 Energy 1.8 Consumer Staples 1.7 Materials 1.5 Utilities 0.5 Common Stocks 97.7 Preferred Stocks 1.0 Preferred Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.3 ASSET ALLOCATION (% of Fund's net assets) United States 94.5 Canada 2.3 Netherlands 0.5 Korea (South) 0.3 Italy 0.3 Switzerland 0.3 Taiwan 0.3 Japan 0.2 United Kingdom 0.2 Others 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 12.1 NVIDIA Corp 10.0 Microsoft Corp 5.8 Berkshire Hathaway Inc Class A 5.7 Amazon.com Inc 5.3 Eli Lilly & Co 3.3 Apple Inc 2.8 Regeneron Pharmaceuticals Inc 2.6 Vertex Pharmaceuticals Inc 2.6 Netflix Inc 2.4 52.6 |
| Fidelity Advisor New Insights Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Advisor® New Insights Fund |
| Class Name | Fidelity Advisor® New Insights Fund Class A |
| Trading Symbol | FNIAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Advisor® New Insights Fund for the period January 1, 2024 to June 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 1-877-208-0098 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 $ 0.91 % |
| Expenses Paid, Amount | $ 51 |
| Expense Ratio, Percent | 0.91% |
| Net Assets | $ 21,213,878,625 |
| Holdings Count | shares | 435 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of June 30, 2024) KEY FACTS Fund Size $ Number of Holdings 435 Portfolio Turnover 14 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 28.5 Communication Services 20.0 Financials 12.8 Health Care 10.8 Consumer Discretionary 10.8 Industrials 9.3 Energy 2.5 Materials 2.2 Consumer Staples 1.4 Utilities 1.1 Real Estate 0.0 Common Stocks 97.5 Preferred Stocks 1.9 Preferred Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.6 Canada 2.4 Netherlands 0.7 Taiwan 0.6 United Kingdom 0.6 Korea (South) 0.5 Italy 0.5 China 0.4 India 0.3 Others 1.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 10.8 NVIDIA Corp 9.3 Microsoft Corp 7.8 Alphabet Inc Class A 6.3 Amazon.com Inc 5.4 Berkshire Hathaway Inc Class A 4.7 Eli Lilly & Co 3.3 Apple Inc 2.6 Netflix Inc 2.0 Regeneron Pharmaceuticals 1.9 54.1 |
| Fidelity Advisor New Insights Fund - Class Z | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Advisor® New Insights Fund |
| Class Name | Fidelity Advisor® New Insights Fund Class Z |
| Trading Symbol | FZANX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Advisor® New Insights Fund for the period January 1, 2024 to June 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 1-877-208-0098 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 $ 0.54 % |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.54% |
| Net Assets | $ 21,213,878,625 |
| Holdings Count | shares | 435 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of June 30, 2024) KEY FACTS Fund Size $ Number of Holdings 435 Portfolio Turnover 14 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 28.5 Communication Services 20.0 Financials 12.8 Health Care 10.8 Consumer Discretionary 10.8 Industrials 9.3 Energy 2.5 Materials 2.2 Consumer Staples 1.4 Utilities 1.1 Real Estate 0.0 Common Stocks 97.5 Preferred Stocks 1.9 Preferred Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.6 Canada 2.4 Netherlands 0.7 Taiwan 0.6 United Kingdom 0.6 Korea (South) 0.5 Italy 0.5 China 0.4 India 0.3 Others 1.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 10.8 NVIDIA Corp 9.3 Microsoft Corp 7.8 Alphabet Inc Class A 6.3 Amazon.com Inc 5.4 Berkshire Hathaway Inc Class A 4.7 Eli Lilly & Co 3.3 Apple Inc 2.6 Netflix Inc 2.0 Regeneron Pharmaceuticals 1.9 54.1 |
| Fidelity Contrafund K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Contrafund® K6 |
| Class Name | Fidelity® Contrafund® K6 |
| Trading Symbol | FLCNX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Contrafund® K6 for the period January 1, 2024 to June 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® Contrafund® K6 $ 0.45 % |
| Expenses Paid, Amount | $ 25 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 35,374,886,492 |
| Holdings Count | shares | 371 |
| Investment Company Portfolio Turnover | 20% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of June 30, 2024) KEY FACTS Fund Size $ Number of Holdings 371 Portfolio Turnover 20 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 27.9 Communication Services 20.3 Financials 14.5 Health Care 11.6 Consumer Discretionary 10.2 Industrials 6.4 Energy 2.4 Consumer Staples 2.1 Materials 1.9 Utilities 0.5 Common Stocks 97.0 Preferred Stocks 0.8 Preferred Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 2.2 ASSET ALLOCATION (% of Fund's net assets) United States 94.8 Canada 2.3 Korea (South) 0.3 Switzerland 0.3 Netherlands 0.3 Taiwan 0.3 United Kingdom 0.2 Brazil 0.2 Japan 0.2 Others 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 12.9 NVIDIA Corp 9.0 Berkshire Hathaway Inc Class A 6.9 Microsoft Corp 6.7 Amazon.com Inc 5.5 Eli Lilly & Co 3.6 Apple Inc 3.5 Alphabet Inc Class A 2.7 Alphabet Inc Class C 2.2 Regeneron Pharmaceuticals Inc 2.1 55.1 |
| Fidelity Contrafund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Contrafund® |
| Class Name | Fidelity® Contrafund® Class K |
| Trading Symbol | FCNKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Contrafund® for the period January 1, 2024 to June 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 $ 0.57 % |
| Expenses Paid, Amount | $ 32 |
| Expense Ratio, Percent | 0.57% |
| Net Assets | $ 143,273,299,484 |
| Holdings Count | shares | 375 |
| Investment Company Portfolio Turnover | 18% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of June 30, 2024) KEY FACTS Fund Size $ Number of Holdings 375 Portfolio Turnover 18 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 27.0 Communication Services 21.9 Financials 15.5 Health Care 11.0 Consumer Discretionary 11.0 Industrials 6.5 Energy 2.0 Consumer Staples 1.9 Materials 1.7 Utilities 0.5 Common Stocks 97.6 Preferred Stocks 1.4 Preferred Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets) United States 94.9 Canada 2.1 Switzerland 0.4 Korea (South) 0.3 Netherlands 0.3 Taiwan 0.3 United Kingdom 0.2 Brazil 0.2 Japan 0.2 Others 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 14.6 NVIDIA Corp 8.7 Berkshire Hathaway Inc Class A 8.0 Microsoft Corp 6.8 Amazon.com Inc 6.5 Eli Lilly & Co 3.3 Apple Inc 3.2 Alphabet Inc Class A 2.6 Alphabet Inc Class C 2.2 Regeneron Pharmaceuticals Inc 2.0 57.9 |
| Fidelity Contrafund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Contrafund® |
| Class Name | Fidelity® Contrafund® |
| Trading Symbol | FCNTX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Contrafund® for the period January 1, 2024 to June 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® Contrafund® $ 0.64 % |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.64% |
| Net Assets | $ 143,273,299,484 |
| Holdings Count | shares | 375 |
| Investment Company Portfolio Turnover | 18% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of June 30, 2024) KEY FACTS Fund Size $ Number of Holdings 375 Portfolio Turnover 18 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 27.0 Communication Services 21.9 Financials 15.5 Health Care 11.0 Consumer Discretionary 11.0 Industrials 6.5 Energy 2.0 Consumer Staples 1.9 Materials 1.7 Utilities 0.5 Common Stocks 97.6 Preferred Stocks 1.4 Preferred Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.0 ASSET ALLOCATION (% of Fund's net assets) United States 94.9 Canada 2.1 Switzerland 0.4 Korea (South) 0.3 Netherlands 0.3 Taiwan 0.3 United Kingdom 0.2 Brazil 0.2 Japan 0.2 Others 1.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 14.6 NVIDIA Corp 8.7 Berkshire Hathaway Inc Class A 8.0 Microsoft Corp 6.8 Amazon.com Inc 6.5 Eli Lilly & Co 3.3 Apple Inc 3.2 Alphabet Inc Class A 2.6 Alphabet Inc Class C 2.2 Regeneron Pharmaceuticals Inc 2.0 57.9 |
| Fidelity Advisor New Insights Fund - Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Advisor® New Insights Fund |
| Class Name | Fidelity Advisor® New Insights Fund Class I |
| Trading Symbol | FINSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Advisor® New Insights Fund for the period January 1, 2024 to June 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 1-877-208-0098 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 $ 0.65 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.65% |
| Net Assets | $ 21,213,878,625 |
| Holdings Count | shares | 435 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of June 30, 2024) KEY FACTS Fund Size $ Number of Holdings 435 Portfolio Turnover 14 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 28.5 Communication Services 20.0 Financials 12.8 Health Care 10.8 Consumer Discretionary 10.8 Industrials 9.3 Energy 2.5 Materials 2.2 Consumer Staples 1.4 Utilities 1.1 Real Estate 0.0 Common Stocks 97.5 Preferred Stocks 1.9 Preferred Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.6 Canada 2.4 Netherlands 0.7 Taiwan 0.6 United Kingdom 0.6 Korea (South) 0.5 Italy 0.5 China 0.4 India 0.3 Others 1.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 10.8 NVIDIA Corp 9.3 Microsoft Corp 7.8 Alphabet Inc Class A 6.3 Amazon.com Inc 5.4 Berkshire Hathaway Inc Class A 4.7 Eli Lilly & Co 3.3 Apple Inc 2.6 Netflix Inc 2.0 Regeneron Pharmaceuticals 1.9 54.1 |
| Fidelity Advisor New Insights Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Advisor® New Insights Fund |
| Class Name | Fidelity Advisor® New Insights Fund Class C |
| Trading Symbol | FNICX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Advisor® New Insights Fund for the period January 1, 2024 to June 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 1-877-208-0098 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 $ 1.66 % |
| Expenses Paid, Amount | $ 92 |
| Expense Ratio, Percent | 1.66% |
| Net Assets | $ 21,213,878,625 |
| Holdings Count | shares | 435 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of June 30, 2024) KEY FACTS Fund Size $ Number of Holdings 435 Portfolio Turnover 14 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 28.5 Communication Services 20.0 Financials 12.8 Health Care 10.8 Consumer Discretionary 10.8 Industrials 9.3 Energy 2.5 Materials 2.2 Consumer Staples 1.4 Utilities 1.1 Real Estate 0.0 Common Stocks 97.5 Preferred Stocks 1.9 Preferred Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.6 Canada 2.4 Netherlands 0.7 Taiwan 0.6 United Kingdom 0.6 Korea (South) 0.5 Italy 0.5 China 0.4 India 0.3 Others 1.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 10.8 NVIDIA Corp 9.3 Microsoft Corp 7.8 Alphabet Inc Class A 6.3 Amazon.com Inc 5.4 Berkshire Hathaway Inc Class A 4.7 Eli Lilly & Co 3.3 Apple Inc 2.6 Netflix Inc 2.0 Regeneron Pharmaceuticals 1.9 54.1 |
| Fidelity Advisor New Insights Fund - Class M | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Advisor® New Insights Fund |
| Class Name | Fidelity Advisor® New Insights Fund Class M |
| Trading Symbol | FNITX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Advisor® New Insights Fund for the period January 1, 2024 to June 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 1-877-208-0098 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 $ 1.16 % |
| Expenses Paid, Amount | $ 65 |
| Expense Ratio, Percent | 1.16% |
| Net Assets | $ 21,213,878,625 |
| Holdings Count | shares | 435 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of June 30, 2024) KEY FACTS Fund Size $ Number of Holdings 435 Portfolio Turnover 14 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 28.5 Communication Services 20.0 Financials 12.8 Health Care 10.8 Consumer Discretionary 10.8 Industrials 9.3 Energy 2.5 Materials 2.2 Consumer Staples 1.4 Utilities 1.1 Real Estate 0.0 Common Stocks 97.5 Preferred Stocks 1.9 Preferred Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.6 ASSET ALLOCATION (% of Fund's net assets) United States 92.6 Canada 2.4 Netherlands 0.7 Taiwan 0.6 United Kingdom 0.6 Korea (South) 0.5 Italy 0.5 China 0.4 India 0.3 Others 1.4 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Meta Platforms Inc Class A 10.8 NVIDIA Corp 9.3 Microsoft Corp 7.8 Alphabet Inc Class A 6.3 Amazon.com Inc 5.4 Berkshire Hathaway Inc Class A 4.7 Eli Lilly & Co 3.3 Apple Inc 2.6 Netflix Inc 2.0 Regeneron Pharmaceuticals 1.9 54.1 |
| Shareholder Report, Holdings (Details) | Jun. 30, 2024 |
| Fidelity Series Opportunistic Insights Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.10% |
| Fidelity Series Opportunistic Insights Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Fidelity Series Opportunistic Insights Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Series Opportunistic Insights Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Series Opportunistic Insights Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Series Opportunistic Insights Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Series Opportunistic Insights Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Series Opportunistic Insights Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Series Opportunistic Insights Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Series Opportunistic Insights Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Series Opportunistic Insights Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.80% |
| Fidelity Series Opportunistic Insights Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.90% |
| Fidelity Series Opportunistic Insights Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.40% |
| Fidelity Series Opportunistic Insights Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.80% |
| Fidelity Series Opportunistic Insights Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Series Opportunistic Insights Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.50% |
| Fidelity Series Opportunistic Insights Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Series Opportunistic Insights Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.80% |
| Fidelity Series Opportunistic Insights Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Series Opportunistic Insights Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Series Opportunistic Insights Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.50% |
| Fidelity Series Opportunistic Insights Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Series Opportunistic Insights Fund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Series Opportunistic Insights Fund | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Series Opportunistic Insights Fund | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Series Opportunistic Insights Fund | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Series Opportunistic Insights Fund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Series Opportunistic Insights Fund | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Series Opportunistic Insights Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Series Opportunistic Insights Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Series Opportunistic Insights Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.70% |
| Fidelity Series Opportunistic Insights Fund | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Series Opportunistic Insights Fund | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Series Opportunistic Insights Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor New Insights Fund - Class A | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class A | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor New Insights Fund - Class A | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Advisor New Insights Fund - Class A | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor New Insights Fund - Class A | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor New Insights Fund - Class A | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Advisor New Insights Fund - Class A | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Advisor New Insights Fund - Class A | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor New Insights Fund - Class A | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor New Insights Fund - Class A | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor New Insights Fund - Class A | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| Fidelity Advisor New Insights Fund - Class A | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.50% |
| Fidelity Advisor New Insights Fund - Class A | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class A | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor New Insights Fund - Class A | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor New Insights Fund - Class A | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor New Insights Fund - Class A | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class A | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor New Insights Fund - Class A | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| Fidelity Advisor New Insights Fund - Class A | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor New Insights Fund - Class A | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor New Insights Fund - Class A | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.60% |
| Fidelity Advisor New Insights Fund - Class A | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor New Insights Fund - Class A | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor New Insights Fund - Class A | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor New Insights Fund - Class A | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor New Insights Fund - Class A | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class A | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class A | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor New Insights Fund - Class A | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Advisor New Insights Fund - Class A | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor New Insights Fund - Class A | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.50% |
| Fidelity Advisor New Insights Fund - Class A | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor New Insights Fund - Class A | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor New Insights Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class Z | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class Z | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor New Insights Fund - Class Z | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Advisor New Insights Fund - Class Z | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor New Insights Fund - Class Z | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor New Insights Fund - Class Z | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Advisor New Insights Fund - Class Z | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Advisor New Insights Fund - Class Z | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor New Insights Fund - Class Z | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor New Insights Fund - Class Z | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor New Insights Fund - Class Z | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| Fidelity Advisor New Insights Fund - Class Z | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.50% |
| Fidelity Advisor New Insights Fund - Class Z | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class Z | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor New Insights Fund - Class Z | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor New Insights Fund - Class Z | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor New Insights Fund - Class Z | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class Z | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor New Insights Fund - Class Z | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| Fidelity Advisor New Insights Fund - Class Z | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor New Insights Fund - Class Z | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor New Insights Fund - Class Z | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.60% |
| Fidelity Advisor New Insights Fund - Class Z | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor New Insights Fund - Class Z | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor New Insights Fund - Class Z | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor New Insights Fund - Class Z | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor New Insights Fund - Class Z | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class Z | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class Z | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor New Insights Fund - Class Z | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Advisor New Insights Fund - Class Z | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor New Insights Fund - Class Z | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.50% |
| Fidelity Advisor New Insights Fund - Class Z | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor New Insights Fund - Class Z | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor New Insights Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Contrafund K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| Fidelity Contrafund K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity Contrafund K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Fidelity Contrafund K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Fidelity Contrafund K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Contrafund K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Contrafund K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Contrafund K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Contrafund K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Contrafund K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Contrafund K6 | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.50% |
| Fidelity Contrafund K6 | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.90% |
| Fidelity Contrafund K6 | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Contrafund K6 | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Contrafund K6 | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Contrafund K6 | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.20% |
| Fidelity Contrafund K6 | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Contrafund K6 | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.30% |
| Fidelity Contrafund K6 | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Contrafund K6 | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Contrafund K6 | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.80% |
| Fidelity Contrafund K6 | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Contrafund K6 | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Contrafund K6 | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Contrafund K6 | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Contrafund K6 | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Contrafund K6 | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Contrafund K6 | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Contrafund K6 | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Contrafund K6 | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Contrafund K6 | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97% |
| Fidelity Contrafund K6 | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Contrafund K6 | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Contrafund K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Contrafund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.60% |
| Fidelity Contrafund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Contrafund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Fidelity Contrafund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Contrafund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Contrafund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Contrafund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Contrafund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Contrafund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Contrafund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Contrafund - Class K | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.50% |
| Fidelity Contrafund - Class K | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27% |
| Fidelity Contrafund - Class K | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Contrafund - Class K | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Contrafund - Class K | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Contrafund - Class K | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Contrafund - Class K | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Contrafund - Class K | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.90% |
| Fidelity Contrafund - Class K | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Contrafund - Class K | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Contrafund - Class K | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.90% |
| Fidelity Contrafund - Class K | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Contrafund - Class K | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Contrafund - Class K | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Contrafund - Class K | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Contrafund - Class K | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Contrafund - Class K | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Contrafund - Class K | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Contrafund - Class K | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Contrafund - Class K | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Contrafund - Class K | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.60% |
| Fidelity Contrafund - Class K | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Contrafund - Class K | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Contrafund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Contrafund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.60% |
| Fidelity Contrafund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Contrafund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Fidelity Contrafund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Contrafund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Contrafund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Contrafund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Contrafund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Contrafund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Contrafund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Contrafund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.50% |
| Fidelity Contrafund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27% |
| Fidelity Contrafund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Contrafund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Contrafund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Contrafund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Contrafund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Contrafund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.90% |
| Fidelity Contrafund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Contrafund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Contrafund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 94.90% |
| Fidelity Contrafund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Contrafund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Contrafund | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Contrafund | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Contrafund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Contrafund | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Contrafund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Contrafund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Contrafund | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Contrafund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.60% |
| Fidelity Contrafund | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Contrafund | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Contrafund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Advisor New Insights Fund - Class I | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class I | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor New Insights Fund - Class I | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Advisor New Insights Fund - Class I | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor New Insights Fund - Class I | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor New Insights Fund - Class I | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Advisor New Insights Fund - Class I | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Advisor New Insights Fund - Class I | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor New Insights Fund - Class I | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor New Insights Fund - Class I | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor New Insights Fund - Class I | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| Fidelity Advisor New Insights Fund - Class I | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.50% |
| Fidelity Advisor New Insights Fund - Class I | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class I | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor New Insights Fund - Class I | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor New Insights Fund - Class I | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor New Insights Fund - Class I | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class I | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor New Insights Fund - Class I | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| Fidelity Advisor New Insights Fund - Class I | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor New Insights Fund - Class I | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor New Insights Fund - Class I | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.60% |
| Fidelity Advisor New Insights Fund - Class I | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor New Insights Fund - Class I | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor New Insights Fund - Class I | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor New Insights Fund - Class I | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor New Insights Fund - Class I | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class I | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class I | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor New Insights Fund - Class I | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Advisor New Insights Fund - Class I | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor New Insights Fund - Class I | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.50% |
| Fidelity Advisor New Insights Fund - Class I | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor New Insights Fund - Class I | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor New Insights Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class C | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class C | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor New Insights Fund - Class C | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Advisor New Insights Fund - Class C | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor New Insights Fund - Class C | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor New Insights Fund - Class C | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Advisor New Insights Fund - Class C | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Advisor New Insights Fund - Class C | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor New Insights Fund - Class C | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor New Insights Fund - Class C | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor New Insights Fund - Class C | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| Fidelity Advisor New Insights Fund - Class C | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.50% |
| Fidelity Advisor New Insights Fund - Class C | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class C | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor New Insights Fund - Class C | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor New Insights Fund - Class C | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor New Insights Fund - Class C | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class C | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor New Insights Fund - Class C | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| Fidelity Advisor New Insights Fund - Class C | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor New Insights Fund - Class C | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor New Insights Fund - Class C | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.60% |
| Fidelity Advisor New Insights Fund - Class C | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor New Insights Fund - Class C | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor New Insights Fund - Class C | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor New Insights Fund - Class C | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor New Insights Fund - Class C | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class C | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class C | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor New Insights Fund - Class C | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Advisor New Insights Fund - Class C | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor New Insights Fund - Class C | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.50% |
| Fidelity Advisor New Insights Fund - Class C | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor New Insights Fund - Class C | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor New Insights Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class M | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class M | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor New Insights Fund - Class M | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Advisor New Insights Fund - Class M | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Advisor New Insights Fund - Class M | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Advisor New Insights Fund - Class M | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Advisor New Insights Fund - Class M | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Advisor New Insights Fund - Class M | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor New Insights Fund - Class M | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor New Insights Fund - Class M | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor New Insights Fund - Class M | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| Fidelity Advisor New Insights Fund - Class M | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.50% |
| Fidelity Advisor New Insights Fund - Class M | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class M | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor New Insights Fund - Class M | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Advisor New Insights Fund - Class M | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor New Insights Fund - Class M | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Advisor New Insights Fund - Class M | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor New Insights Fund - Class M | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| Fidelity Advisor New Insights Fund - Class M | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor New Insights Fund - Class M | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor New Insights Fund - Class M | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.60% |
| Fidelity Advisor New Insights Fund - Class M | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Advisor New Insights Fund - Class M | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor New Insights Fund - Class M | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor New Insights Fund - Class M | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor New Insights Fund - Class M | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class M | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor New Insights Fund - Class M | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor New Insights Fund - Class M | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Advisor New Insights Fund - Class M | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor New Insights Fund - Class M | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.50% |
| Fidelity Advisor New Insights Fund - Class M | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor New Insights Fund - Class M | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor New Insights Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
