| Form N-CSR Cover | 6 Months Ended |
| Oct. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Fidelity Concord Street Trust |
| Entity Central Index Key | 0000819118 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| Shareholder Report | 6 Months Ended |
| Oct. 31, 2024 USD ($) shares | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Fidelity Concord Street Trust |
| Entity Central Index Key | 0000819118 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| Fidelity Advisor Founders Fund - Class Z | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Founders Fund |
| Class Name | Fidelity Advisor® Founders Fund Class Z |
| Trading Symbol | FIFWX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Founders Fund for the period May 1, 2024 to October 31, 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 $ 0.61 % |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.61% |
| Net Assets | $ 163,232,092 |
| Holdings Count | shares | 150 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 150 Portfolio Turnover 42 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 29.5 Consumer Discretionary 17.7 Financials 14.9 Communication Services 14.4 Health Care 6.8 Industrials 6.8 Real Estate 4.5 Energy 2.5 Materials 0.6 Consumer Staples 0.3 Common Stocks 97.7 Preferred Stocks 0.3 Short-Term Investments and Net Other Assets (Liabilities) 2.0 ASSET ALLOCATION (% of Fund's net assets) United States 89.0 Canada 4.7 Italy 1.7 China 1.3 Germany 0.8 Spain 0.7 Netherlands 0.5 Taiwan 0.5 France 0.3 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) NVIDIA Corp 8.4 Microsoft Corp 6.4 Meta Platforms Inc Class A 5.0 Alphabet Inc Class C 4.6 Amazon.com Inc 4.5 Apollo Global Management Inc 3.1 Netflix Inc 2.6 Blackrock Inc 2.2 Oracle Corp 1.9 Analog Devices Inc 1.7 40.4 |
| Fidelity Advisor Founders Fund - Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Founders Fund |
| Class Name | Fidelity Advisor® Founders Fund Class I |
| Trading Symbol | FIFVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Founders Fund for the period May 1, 2024 to October 31, 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 $ 0.69 % |
| Expenses Paid, Amount | $ 38 |
| Expense Ratio, Percent | 0.69% |
| Net Assets | $ 163,232,092 |
| Holdings Count | shares | 150 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 150 Portfolio Turnover 42 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 29.5 Consumer Discretionary 17.7 Financials 14.9 Communication Services 14.4 Health Care 6.8 Industrials 6.8 Real Estate 4.5 Energy 2.5 Materials 0.6 Consumer Staples 0.3 Common Stocks 97.7 Preferred Stocks 0.3 Short-Term Investments and Net Other Assets (Liabilities) 2.0 ASSET ALLOCATION (% of Fund's net assets) United States 89.0 Canada 4.7 Italy 1.7 China 1.3 Germany 0.8 Spain 0.7 Netherlands 0.5 Taiwan 0.5 France 0.3 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) NVIDIA Corp 8.4 Microsoft Corp 6.4 Meta Platforms Inc Class A 5.0 Alphabet Inc Class C 4.6 Amazon.com Inc 4.5 Apollo Global Management Inc 3.1 Netflix Inc 2.6 Blackrock Inc 2.2 Oracle Corp 1.9 Analog Devices Inc 1.7 40.4 |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mid-Cap Stock Fund |
| Class Name | Fidelity Advisor® Mid-Cap Stock Fund Class Z |
| Trading Symbol | FMCWX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mid-Cap Stock Fund for the period October 8, 2024 to October 31, 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 A $ 0.62 % A Expenses for the full reporting period would be higher. |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.62% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 7,481,040,156 |
| Holdings Count | shares | 180 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 180 Portfolio Turnover 58 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Industrials 23.2 Financials 14.1 Consumer Discretionary 13.2 Information Technology 9.4 Health Care 9.2 Materials 7.0 Real Estate 6.5 Energy 4.9 Consumer Staples 3.9 Utilities 2.5 Communication Services 2.0 Common Stocks 95.3 Preferred Stocks 0.6 Short-Term Investments and Net Other Assets (Liabilities) 4.1 ASSET ALLOCATION (% of Fund's net assets) United States 89.5 Canada 2.9 United Kingdom 2.2 Italy 1.8 Belgium 0.8 Thailand 0.8 Brazil 0.6 Israel 0.5 Japan 0.4 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 1.5 Imperial Oil Ltd 1.4 American Financial Group Inc/OH 1.4 AECOM 1.3 Jones Lang LaSalle Inc 1.3 Wintrust Financial Corp 1.2 TransUnion 1.2 M&T Bank Corp 1.2 Allison Transmission Holdings Inc 1.2 Acuity Brands Inc 1.1 12.8 |
| Fidelity Series Small Cap Discovery Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Series Small Cap Discovery Fund |
| Class Name | Fidelity® Series Small Cap Discovery Fund |
| Trading Symbol | FJACX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Series Small Cap Discovery Fund for the period May 1, 2024 to October 31, 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 Small Cap Discovery 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 | $ 1,552,358,929 |
| Holdings Count | shares | 116 |
| Investment Company Portfolio Turnover | 83% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 116 Portfolio Turnover 83 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Industrials 27.3 Information Technology 17.3 Financials 15.2 Consumer Discretionary 10.4 Health Care 7.0 Materials 6.4 Consumer Staples 5.6 Energy 5.0 Utilities 2.0 Communication Services 0.1 Common Stocks 96.3 Short-Term Investments and Net Other Assets (Liabilities) 3.7 ASSET ALLOCATION (% of Fund's net assets) United States 93.6 Canada 3.9 Puerto Rico 1.5 India 0.9 Israel 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 4.3 Genpact Ltd 4.2 Beacon Roofing Supply Inc 3.3 Insight Enterprises Inc 3.1 FirstCash Holdings Inc 2.7 Murphy USA Inc 2.7 ASGN Inc 2.5 Primerica Inc 2.4 Maximus Inc 2.3 Lumentum Holdings Inc 2.1 29.6 |
| Fidelity Advisor Founders Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Founders Fund |
| Class Name | Fidelity Advisor® Founders Fund Class C |
| Trading Symbol | FIFQX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Founders Fund for the period May 1, 2024 to October 31, 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 $ 1.76 % |
| Expenses Paid, Amount | $ 95 |
| Expense Ratio, Percent | 1.76% |
| Net Assets | $ 163,232,092 |
| Holdings Count | shares | 150 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 150 Portfolio Turnover 42 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 29.5 Consumer Discretionary 17.7 Financials 14.9 Communication Services 14.4 Health Care 6.8 Industrials 6.8 Real Estate 4.5 Energy 2.5 Materials 0.6 Consumer Staples 0.3 Common Stocks 97.7 Preferred Stocks 0.3 Short-Term Investments and Net Other Assets (Liabilities) 2.0 ASSET ALLOCATION (% of Fund's net assets) United States 89.0 Canada 4.7 Italy 1.7 China 1.3 Germany 0.8 Spain 0.7 Netherlands 0.5 Taiwan 0.5 France 0.3 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) NVIDIA Corp 8.4 Microsoft Corp 6.4 Meta Platforms Inc Class A 5.0 Alphabet Inc Class C 4.6 Amazon.com Inc 4.5 Apollo Global Management Inc 3.1 Netflix Inc 2.6 Blackrock Inc 2.2 Oracle Corp 1.9 Analog Devices Inc 1.7 40.4 |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mid-Cap Stock Fund |
| Class Name | Fidelity Advisor® Mid-Cap Stock Fund Class I |
| Trading Symbol | FMCQX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mid-Cap Stock Fund for the period October 8, 2024 to October 31, 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 A $ 0.74 % A Expenses for the full reporting period would be higher. |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.74% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 7,481,040,156 |
| Holdings Count | shares | 180 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 180 Portfolio Turnover 58 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Industrials 23.2 Financials 14.1 Consumer Discretionary 13.2 Information Technology 9.4 Health Care 9.2 Materials 7.0 Real Estate 6.5 Energy 4.9 Consumer Staples 3.9 Utilities 2.5 Communication Services 2.0 Common Stocks 95.3 Preferred Stocks 0.6 Short-Term Investments and Net Other Assets (Liabilities) 4.1 ASSET ALLOCATION (% of Fund's net assets) United States 89.5 Canada 2.9 United Kingdom 2.2 Italy 1.8 Belgium 0.8 Thailand 0.8 Brazil 0.6 Israel 0.5 Japan 0.4 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 1.5 Imperial Oil Ltd 1.4 American Financial Group Inc/OH 1.4 AECOM 1.3 Jones Lang LaSalle Inc 1.3 Wintrust Financial Corp 1.2 TransUnion 1.2 M&T Bank Corp 1.2 Allison Transmission Holdings Inc 1.2 Acuity Brands Inc 1.1 12.8 |
| Fidelity Small Cap Discovery Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Small Cap Discovery Fund |
| Class Name | Fidelity® Small Cap Discovery Fund |
| Trading Symbol | FSCRX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Small Cap Discovery Fund for the period May 1, 2024 to October 31, 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® Small Cap Discovery Fund $ 1.01 % |
| Expenses Paid, Amount | $ 52 |
| Expense Ratio, Percent | 1.01% |
| Net Assets | $ 2,294,023,755 |
| Holdings Count | shares | 116 |
| Investment Company Portfolio Turnover | 61% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 116 Portfolio Turnover 61 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Industrials 27.3 Information Technology 17.1 Financials 15.1 Consumer Discretionary 11.4 Health Care 6.9 Materials 6.6 Energy 6.1 Consumer Staples 5.5 Utilities 1.9 Communication Services 0.1 Common Stocks 98.0 Short-Term Investments and Net Other Assets (Liabilities) 2.0 ASSET ALLOCATION (% of Fund's net assets) United States 92.8 Canada 4.8 Puerto Rico 1.4 India 0.9 Israel 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 4.3 Genpact Ltd 4.0 Beacon Roofing Supply Inc 3.3 Insight Enterprises Inc 3.0 Maximus Inc 2.6 FirstCash Holdings Inc 2.6 ASGN Inc 2.6 Murphy USA Inc 2.5 Laureate Education Inc 2.4 Primerica Inc 2.3 29.6 |
| Fidelity Mid-Cap Stock Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mid-Cap Stock Fund |
| Class Name | Fidelity® Mid-Cap Stock Fund |
| Trading Symbol | FMCSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mid-Cap Stock Fund for the period May 1, 2024 to October 31, 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® Mid-Cap Stock Fund $ 0.69 % |
| Expenses Paid, Amount | $ 37 |
| Expense Ratio, Percent | 0.69% |
| Net Assets | $ 7,481,040,156 |
| Holdings Count | shares | 180 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 180 Portfolio Turnover 58 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Industrials 23.2 Financials 14.1 Consumer Discretionary 13.2 Information Technology 9.4 Health Care 9.2 Materials 7.0 Real Estate 6.5 Energy 4.9 Consumer Staples 3.9 Utilities 2.5 Communication Services 2.0 Common Stocks 95.3 Preferred Stocks 0.6 Short-Term Investments and Net Other Assets (Liabilities) 4.1 ASSET ALLOCATION (% of Fund's net assets) United States 89.5 Canada 2.9 United Kingdom 2.2 Italy 1.8 Belgium 0.8 Thailand 0.8 Brazil 0.6 Israel 0.5 Japan 0.4 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 1.5 Imperial Oil Ltd 1.4 American Financial Group Inc/OH 1.4 AECOM 1.3 Jones Lang LaSalle Inc 1.3 Wintrust Financial Corp 1.2 TransUnion 1.2 M&T Bank Corp 1.2 Allison Transmission Holdings Inc 1.2 Acuity Brands Inc 1.1 12.8 |
| Fidelity Mid-Cap Stock Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mid-Cap Stock Fund |
| Class Name | Fidelity® Mid-Cap Stock Fund Class K |
| Trading Symbol | FKMCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mid-Cap Stock Fund for the period May 1, 2024 to October 31, 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 $ 0.62 % |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.62% |
| Net Assets | $ 7,481,040,156 |
| Holdings Count | shares | 180 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 180 Portfolio Turnover 58 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Industrials 23.2 Financials 14.1 Consumer Discretionary 13.2 Information Technology 9.4 Health Care 9.2 Materials 7.0 Real Estate 6.5 Energy 4.9 Consumer Staples 3.9 Utilities 2.5 Communication Services 2.0 Common Stocks 95.3 Preferred Stocks 0.6 Short-Term Investments and Net Other Assets (Liabilities) 4.1 ASSET ALLOCATION (% of Fund's net assets) United States 89.5 Canada 2.9 United Kingdom 2.2 Italy 1.8 Belgium 0.8 Thailand 0.8 Brazil 0.6 Israel 0.5 Japan 0.4 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 1.5 Imperial Oil Ltd 1.4 American Financial Group Inc/OH 1.4 AECOM 1.3 Jones Lang LaSalle Inc 1.3 Wintrust Financial Corp 1.2 TransUnion 1.2 M&T Bank Corp 1.2 Allison Transmission Holdings Inc 1.2 Acuity Brands Inc 1.1 12.8 |
| Fidelity Small Cap Stock Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Small Cap Stock Fund |
| Class Name | Fidelity® Small Cap Stock Fund |
| Trading Symbol | FSLCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Small Cap Stock Fund for the period May 1, 2024 to October 31, 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® Small Cap Stock Fund $ 0.88 % |
| Expenses Paid, Amount | $ 47 |
| Expense Ratio, Percent | 0.88% |
| Net Assets | $ 1,178,053,648 |
| Holdings Count | shares | 159 |
| Investment Company Portfolio Turnover | 102% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 159 Portfolio Turnover 102 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Industrials 18.0 Financials 17.8 Information Technology 15.7 Health Care 12.9 Consumer Discretionary 10.9 Materials 6.6 Consumer Staples 5.4 Energy 4.4 Utilities 3.6 Real Estate 3.6 Communication Services 0.7 Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) United States 89.2 Canada 3.8 United Kingdom 1.6 Taiwan 1.2 Israel 1.2 Puerto Rico 1.0 Japan 0.7 Thailand 0.6 India 0.5 Others 0.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 3.2 Grand Canyon Education Inc 3.0 Lumentum Holdings Inc 2.6 Baldwin Insurance Group Inc/The Class A 2.6 Selective Insurance Group Inc 2.5 Murphy USA Inc 2.5 Ciena Corp 2.2 FirstCash Holdings Inc 2.1 Insight Enterprises Inc 2.0 Brookfield Infrastructure Corp Class A (United States) 2.0 24.7 |
| Fidelity Large Cap Stock K6 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Large Cap Stock K6 Fund |
| Class Name | Fidelity® Large Cap Stock K6 Fund |
| Trading Symbol | FCLKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Large Cap Stock K6 Fund for the period May 1, 2024 to October 31, 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® Large Cap Stock K6 Fund $ 0.45 % |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 63,676,577 |
| Holdings Count | shares | 184 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 184 Portfolio Turnover 11 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 21.2 Industrials 16.2 Financials 15.7 Health Care 10.5 Communication Services 9.5 Energy 8.5 Consumer Staples 4.6 Consumer Discretionary 2.9 Materials 1.7 Utilities 1.1 Real Estate 0.8 Common Stocks 92.7 Short-Term Investments and Net Other Assets (Liabilities) 7.3 ASSET ALLOCATION (% of Fund's net assets) United States 92.2 Canada 2.0 Germany 1.1 Zambia 1.0 Belgium 0.9 United Kingdom 0.7 Netherlands 0.6 France 0.5 Taiwan 0.4 Others 0.6 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Microsoft Corp 6.2 Wells Fargo & Co 5.8 NVIDIA Corp 5.1 Exxon Mobil Corp 5.0 GE Aerospace 5.0 Meta Platforms Inc Class A 3.0 Boeing Co 2.8 GE Vernova Inc 2.7 Apple Inc 2.6 Bank of America Corp 2.4 40.6 |
| Fidelity Large Cap Stock Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Large Cap Stock Fund |
| Class Name | Fidelity® Large Cap Stock Fund |
| Trading Symbol | FLCSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Large Cap Stock Fund for the period May 1, 2024 to October 31, 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® Large Cap Stock Fund $ 0.75 % |
| Expenses Paid, Amount | $ 40 |
| Expense Ratio, Percent | 0.75% |
| Net Assets | $ 5,050,446,146 |
| Holdings Count | shares | 186 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 186 Portfolio Turnover 13 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 21.4 Industrials 16.7 Financials 16.2 Health Care 10.9 Communication Services 9.6 Energy 8.7 Consumer Staples 4.9 Consumer Discretionary 3.0 Materials 1.8 Utilities 1.2 Real Estate 0.8 Common Stocks 95.2 Short-Term Investments and Net Other Assets (Liabilities) 4.8 ASSET ALLOCATION (% of Fund's net assets) United States 91.9 Canada 2.0 Germany 1.0 Zambia 1.0 Belgium 0.9 United Kingdom 0.8 Netherlands 0.7 France 0.5 Taiwan 0.5 Others 0.7 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Microsoft Corp 6.2 Wells Fargo & Co 5.9 Exxon Mobil Corp 5.2 NVIDIA Corp 5.1 GE Aerospace 5.0 Meta Platforms Inc Class A 2.9 Boeing Co 2.8 GE Vernova Inc 2.7 Apple Inc 2.6 Bank of America Corp 2.5 40.9 |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mid-Cap Stock Fund |
| Class Name | Fidelity Advisor® Mid-Cap Stock Fund Class A |
| Trading Symbol | FMCHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mid-Cap Stock Fund for the period October 8, 2024 to October 31, 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 A $ 0.98 % A Expenses for the full reporting period would be higher. |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.98% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 7,481,040,156 |
| Holdings Count | shares | 180 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 180 Portfolio Turnover 58 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Industrials 23.2 Financials 14.1 Consumer Discretionary 13.2 Information Technology 9.4 Health Care 9.2 Materials 7.0 Real Estate 6.5 Energy 4.9 Consumer Staples 3.9 Utilities 2.5 Communication Services 2.0 Common Stocks 95.3 Preferred Stocks 0.6 Short-Term Investments and Net Other Assets (Liabilities) 4.1 ASSET ALLOCATION (% of Fund's net assets) United States 89.5 Canada 2.9 United Kingdom 2.2 Italy 1.8 Belgium 0.8 Thailand 0.8 Brazil 0.6 Israel 0.5 Japan 0.4 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 1.5 Imperial Oil Ltd 1.4 American Financial Group Inc/OH 1.4 AECOM 1.3 Jones Lang LaSalle Inc 1.3 Wintrust Financial Corp 1.2 TransUnion 1.2 M&T Bank Corp 1.2 Allison Transmission Holdings Inc 1.2 Acuity Brands Inc 1.1 12.8 |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mid-Cap Stock Fund |
| Class Name | Fidelity Advisor® Mid-Cap Stock Fund Class M |
| Trading Symbol | FMCJX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mid-Cap Stock Fund for the period October 8, 2024 to October 31, 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 A $ 1.23 % A Expenses for the full reporting period would be higher. |
| Expenses Paid, Amount | $ 8 |
| Expense Ratio, Percent | 1.23% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 7,481,040,156 |
| Holdings Count | shares | 180 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 180 Portfolio Turnover 58 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Industrials 23.2 Financials 14.1 Consumer Discretionary 13.2 Information Technology 9.4 Health Care 9.2 Materials 7.0 Real Estate 6.5 Energy 4.9 Consumer Staples 3.9 Utilities 2.5 Communication Services 2.0 Common Stocks 95.3 Preferred Stocks 0.6 Short-Term Investments and Net Other Assets (Liabilities) 4.1 ASSET ALLOCATION (% of Fund's net assets) United States 89.5 Canada 2.9 United Kingdom 2.2 Italy 1.8 Belgium 0.8 Thailand 0.8 Brazil 0.6 Israel 0.5 Japan 0.4 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 1.5 Imperial Oil Ltd 1.4 American Financial Group Inc/OH 1.4 AECOM 1.3 Jones Lang LaSalle Inc 1.3 Wintrust Financial Corp 1.2 TransUnion 1.2 M&T Bank Corp 1.2 Allison Transmission Holdings Inc 1.2 Acuity Brands Inc 1.1 12.8 |
| Fidelity Founders Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Founders Fund |
| Class Name | Fidelity® Founders Fund |
| Trading Symbol | FIFNX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Founders Fund for the period May 1, 2024 to October 31, 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® Founders Fund $ 0.72 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.72% |
| Net Assets | $ 163,232,092 |
| Holdings Count | shares | 150 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 150 Portfolio Turnover 42 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 29.5 Consumer Discretionary 17.7 Financials 14.9 Communication Services 14.4 Health Care 6.8 Industrials 6.8 Real Estate 4.5 Energy 2.5 Materials 0.6 Consumer Staples 0.3 Common Stocks 97.7 Preferred Stocks 0.3 Short-Term Investments and Net Other Assets (Liabilities) 2.0 ASSET ALLOCATION (% of Fund's net assets) United States 89.0 Canada 4.7 Italy 1.7 China 1.3 Germany 0.8 Spain 0.7 Netherlands 0.5 Taiwan 0.5 France 0.3 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) NVIDIA Corp 8.4 Microsoft Corp 6.4 Meta Platforms Inc Class A 5.0 Alphabet Inc Class C 4.6 Amazon.com Inc 4.5 Apollo Global Management Inc 3.1 Netflix Inc 2.6 Blackrock Inc 2.2 Oracle Corp 1.9 Analog Devices Inc 1.7 40.4 |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mid-Cap Stock Fund |
| Class Name | Fidelity Advisor® Mid-Cap Stock Fund Class C |
| Trading Symbol | FMCNX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mid-Cap Stock Fund for the period October 8, 2024 to October 31, 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 A $ 1.76 % A Expenses for the full reporting period would be higher. |
| Expenses Paid, Amount | $ 12 |
| Expense Ratio, Percent | 1.76% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 7,481,040,156 |
| Holdings Count | shares | 180 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 180 Portfolio Turnover 58 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Industrials 23.2 Financials 14.1 Consumer Discretionary 13.2 Information Technology 9.4 Health Care 9.2 Materials 7.0 Real Estate 6.5 Energy 4.9 Consumer Staples 3.9 Utilities 2.5 Communication Services 2.0 Common Stocks 95.3 Preferred Stocks 0.6 Short-Term Investments and Net Other Assets (Liabilities) 4.1 ASSET ALLOCATION (% of Fund's net assets) United States 89.5 Canada 2.9 United Kingdom 2.2 Italy 1.8 Belgium 0.8 Thailand 0.8 Brazil 0.6 Israel 0.5 Japan 0.4 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 1.5 Imperial Oil Ltd 1.4 American Financial Group Inc/OH 1.4 AECOM 1.3 Jones Lang LaSalle Inc 1.3 Wintrust Financial Corp 1.2 TransUnion 1.2 M&T Bank Corp 1.2 Allison Transmission Holdings Inc 1.2 Acuity Brands Inc 1.1 12.8 |
| Fidelity Series Small Cap Core Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Series Small Cap Core Fund |
| Class Name | Fidelity® Series Small Cap Core Fund |
| Trading Symbol | FSSLX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Series Small Cap Core Fund for the period May 1, 2024 to October 31, 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 Small Cap Core 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 | $ 1,193,565,446 |
| Holdings Count | shares | 231 |
| Investment Company Portfolio Turnover | 47% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 231 Portfolio Turnover 47 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Financials 20.2 Industrials 16.5 Health Care 15.9 Information Technology 12.4 Consumer Discretionary 9.4 Real Estate 6.7 Energy 5.0 Materials 3.8 Consumer Staples 2.8 Communication Services 2.4 Utilities 2.1 Common Stocks 97.2 Short-Term Investments and Net Other Assets (Liabilities) 2.8 ASSET ALLOCATION (% of Fund's net assets) United States 93.7 Israel 1.3 Canada 1.3 United Kingdom 0.8 Bahamas (Nassau) 0.6 Puerto Rico 0.6 Cameroon 0.5 India 0.4 Netherlands 0.3 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Vaxcyte Inc 1.1 Applied Industrial Technologies Inc 1.0 Wintrust Financial Corp 1.0 Cadence Bank 1.0 Brink's Co/The 1.0 Baldwin Insurance Group Inc/The Class A 1.0 First Interstate BancSystem Inc Class A 0.9 Ensign Group Inc/The 0.9 FTAI Aviation Ltd 0.9 Western Alliance Bancorp 0.9 9.7 |
| Fidelity Mid-Cap Stock K6 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mid-Cap Stock K6 Fund |
| Class Name | Fidelity® Mid-Cap Stock K6 Fund |
| Trading Symbol | FNKFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mid-Cap Stock K6 Fund for the period May 1, 2024 to October 31, 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® Mid-Cap Stock K6 Fund $ 0.45 % |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 1,018,352,553 |
| Holdings Count | shares | 180 |
| Investment Company Portfolio Turnover | 96% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 180 Portfolio Turnover 96 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Industrials 22.3 Financials 14.7 Consumer Discretionary 13.6 Information Technology 9.6 Health Care 9.0 Materials 7.5 Real Estate 6.6 Energy 5.0 Consumer Staples 4.0 Utilities 2.4 Communication Services 2.1 Common Stocks 96.6 Preferred Stocks 0.2 Short-Term Investments and Net Other Assets (Liabilities) 3.2 ASSET ALLOCATION (% of Fund's net assets) United States 89.3 Canada 3.1 United Kingdom 2.2 Italy 1.8 Belgium 0.8 Thailand 0.8 Brazil 0.6 Israel 0.5 Japan 0.4 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 1.5 Imperial Oil Ltd 1.5 American Financial Group Inc/OH 1.4 AECOM 1.3 Jones Lang LaSalle Inc 1.3 Wintrust Financial Corp 1.2 TransUnion 1.2 M&T Bank Corp 1.2 Allison Transmission Holdings Inc 1.2 Fortune Brands Innovations Inc 1.2 13.0 |
| Fidelity Small Cap Stock K6 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Small Cap Stock K6 Fund |
| Class Name | Fidelity® Small Cap Stock K6 Fund |
| Trading Symbol | FKICX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Small Cap Stock K6 Fund for the period May 1, 2024 to October 31, 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® Small Cap Stock K6 Fund $ 0.61 % |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.61% |
| Net Assets | $ 19,700,526 |
| Holdings Count | shares | 158 |
| Investment Company Portfolio Turnover | 132% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 158 Portfolio Turnover 132 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Financials 18.4 Industrials 17.6 Information Technology 15.2 Health Care 14.7 Consumer Discretionary 10.4 Materials 6.2 Consumer Staples 5.2 Energy 4.4 Utilities 3.5 Real Estate 3.4 Communication Services 0.6 Common Stocks 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) United States 89.1 Canada 3.7 United Kingdom 1.5 Taiwan 1.2 Israel 1.2 Puerto Rico 1.0 Japan 0.7 Thailand 0.6 India 0.5 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Performance Food Group Co 3.1 Grand Canyon Education Inc 3.0 Lumentum Holdings Inc 2.6 Baldwin Insurance Group Inc/The Class A 2.5 Murphy USA Inc 2.4 Selective Insurance Group Inc 2.3 Ciena Corp 2.2 FirstCash Holdings Inc 2.1 Brookfield Infrastructure Corp Class A (United States) 2.0 Insight Enterprises Inc 1.8 24.0 |
| Fidelity Advisor Founders Fund - Class M | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Founders Fund |
| Class Name | Fidelity Advisor® Founders Fund Class M |
| Trading Symbol | FIFPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Founders Fund for the period May 1, 2024 to October 31, 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 $ 1.26 % |
| Expenses Paid, Amount | $ 68 |
| Expense Ratio, Percent | 1.26% |
| Net Assets | $ 163,232,092 |
| Holdings Count | shares | 150 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 150 Portfolio Turnover 42 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 29.5 Consumer Discretionary 17.7 Financials 14.9 Communication Services 14.4 Health Care 6.8 Industrials 6.8 Real Estate 4.5 Energy 2.5 Materials 0.6 Consumer Staples 0.3 Common Stocks 97.7 Preferred Stocks 0.3 Short-Term Investments and Net Other Assets (Liabilities) 2.0 ASSET ALLOCATION (% of Fund's net assets) United States 89.0 Canada 4.7 Italy 1.7 China 1.3 Germany 0.8 Spain 0.7 Netherlands 0.5 Taiwan 0.5 France 0.3 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) NVIDIA Corp 8.4 Microsoft Corp 6.4 Meta Platforms Inc Class A 5.0 Alphabet Inc Class C 4.6 Amazon.com Inc 4.5 Apollo Global Management Inc 3.1 Netflix Inc 2.6 Blackrock Inc 2.2 Oracle Corp 1.9 Analog Devices Inc 1.7 40.4 |
| Fidelity Advisor Founders Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Founders Fund |
| Class Name | Fidelity Advisor® Founders Fund Class A |
| Trading Symbol | FIFOX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Founders Fund for the period May 1, 2024 to October 31, 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 $ 1.01 % |
| Expenses Paid, Amount | $ 55 |
| Expense Ratio, Percent | 1.01% |
| Net Assets | $ 163,232,092 |
| Holdings Count | shares | 150 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of October 31, 2024) KEY FACTS Fund Size $ Number of Holdings 150 Portfolio Turnover 42 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 29.5 Consumer Discretionary 17.7 Financials 14.9 Communication Services 14.4 Health Care 6.8 Industrials 6.8 Real Estate 4.5 Energy 2.5 Materials 0.6 Consumer Staples 0.3 Common Stocks 97.7 Preferred Stocks 0.3 Short-Term Investments and Net Other Assets (Liabilities) 2.0 ASSET ALLOCATION (% of Fund's net assets) United States 89.0 Canada 4.7 Italy 1.7 China 1.3 Germany 0.8 Spain 0.7 Netherlands 0.5 Taiwan 0.5 France 0.3 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) NVIDIA Corp 8.4 Microsoft Corp 6.4 Meta Platforms Inc Class A 5.0 Alphabet Inc Class C 4.6 Amazon.com Inc 4.5 Apollo Global Management Inc 3.1 Netflix Inc 2.6 Blackrock Inc 2.2 Oracle Corp 1.9 Analog Devices Inc 1.7 40.4 |
| Shareholder Report, Holdings (Details) | Oct. 31, 2024 |
| Fidelity Advisor Founders Fund - Class Z | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Advisor Founders Fund - Class Z | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Advisor Founders Fund - Class Z | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Advisor Founders Fund - Class Z | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Founders Fund - Class Z | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Founders Fund - Class Z | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Advisor Founders Fund - Class Z | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor Founders Fund - Class Z | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor Founders Fund - Class Z | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor Founders Fund - Class Z | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Founders Fund - Class Z | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.90% |
| Fidelity Advisor Founders Fund - Class Z | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.50% |
| Fidelity Advisor Founders Fund - Class Z | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Advisor Founders Fund - Class Z | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Founders Fund - Class Z | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Advisor Founders Fund - Class Z | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Founders Fund - Class Z | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Advisor Founders Fund - Class Z | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class Z | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| Fidelity Advisor Founders Fund - Class Z | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Founders Fund - Class Z | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89% |
| Fidelity Advisor Founders Fund - Class Z | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Advisor Founders Fund - Class Z | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Founders Fund - Class Z | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Founders Fund - Class Z | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Founders Fund - Class Z | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Founders Fund - Class Z | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class Z | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class Z | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class Z | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class Z | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.70% |
| Fidelity Advisor Founders Fund - Class Z | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor Founders Fund - Class I | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Advisor Founders Fund - Class I | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Advisor Founders Fund - Class I | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Advisor Founders Fund - Class I | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Founders Fund - Class I | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Founders Fund - Class I | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Advisor Founders Fund - Class I | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor Founders Fund - Class I | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor Founders Fund - Class I | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor Founders Fund - Class I | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Founders Fund - Class I | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.90% |
| Fidelity Advisor Founders Fund - Class I | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.50% |
| Fidelity Advisor Founders Fund - Class I | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Advisor Founders Fund - Class I | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Founders Fund - Class I | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Advisor Founders Fund - Class I | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Founders Fund - Class I | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Advisor Founders Fund - Class I | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class I | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| Fidelity Advisor Founders Fund - Class I | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Founders Fund - Class I | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89% |
| Fidelity Advisor Founders Fund - Class I | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Advisor Founders Fund - Class I | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Founders Fund - Class I | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Founders Fund - Class I | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Founders Fund - Class I | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Founders Fund - Class I | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class I | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class I | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class I | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class I | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.70% |
| Fidelity Advisor Founders Fund - Class I | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Thailand | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mid-Cap Stock Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Series Small Cap Discovery Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Fidelity Series Small Cap Discovery Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Series Small Cap Discovery Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Series Small Cap Discovery Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Series Small Cap Discovery Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Series Small Cap Discovery Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Series Small Cap Discovery Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Series Small Cap Discovery Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Series Small Cap Discovery Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Series Small Cap Discovery Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Series Small Cap Discovery Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| Fidelity Series Small Cap Discovery Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.30% |
| Fidelity Series Small Cap Discovery Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Series Small Cap Discovery Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.30% |
| Fidelity Series Small Cap Discovery Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Series Small Cap Discovery Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| Fidelity Series Small Cap Discovery Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Series Small Cap Discovery Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Series Small Cap Discovery Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Series Small Cap Discovery Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Series Small Cap Discovery Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.60% |
| Fidelity Series Small Cap Discovery Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Series Small Cap Discovery Fund | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Series Small Cap Discovery Fund | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Series Small Cap Discovery Fund | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Series Small Cap Discovery Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 96.30% |
| Fidelity Series Small Cap Discovery Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Advisor Founders Fund - Class C | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Advisor Founders Fund - Class C | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Advisor Founders Fund - Class C | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Advisor Founders Fund - Class C | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Founders Fund - Class C | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Founders Fund - Class C | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Advisor Founders Fund - Class C | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor Founders Fund - Class C | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor Founders Fund - Class C | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor Founders Fund - Class C | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Founders Fund - Class C | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.90% |
| Fidelity Advisor Founders Fund - Class C | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.50% |
| Fidelity Advisor Founders Fund - Class C | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Advisor Founders Fund - Class C | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Founders Fund - Class C | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Advisor Founders Fund - Class C | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Founders Fund - Class C | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Advisor Founders Fund - Class C | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class C | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| Fidelity Advisor Founders Fund - Class C | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Founders Fund - Class C | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89% |
| Fidelity Advisor Founders Fund - Class C | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Advisor Founders Fund - Class C | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Founders Fund - Class C | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Founders Fund - Class C | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Founders Fund - Class C | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Founders Fund - Class C | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class C | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class C | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class C | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class C | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.70% |
| Fidelity Advisor Founders Fund - Class C | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Thailand | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mid-Cap Stock Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Small Cap Discovery Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Fidelity Small Cap Discovery Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Small Cap Discovery Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Small Cap Discovery Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Small Cap Discovery Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Small Cap Discovery Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Small Cap Discovery Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Small Cap Discovery Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Small Cap Discovery Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Small Cap Discovery Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Small Cap Discovery Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.10% |
| Fidelity Small Cap Discovery Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.10% |
| Fidelity Small Cap Discovery Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Fidelity Small Cap Discovery Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.30% |
| Fidelity Small Cap Discovery Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| Fidelity Small Cap Discovery Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.40% |
| Fidelity Small Cap Discovery Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Small Cap Discovery Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Small Cap Discovery Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Fidelity Small Cap Discovery Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Small Cap Discovery Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.80% |
| Fidelity Small Cap Discovery Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Small Cap Discovery Fund | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Small Cap Discovery Fund | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Small Cap Discovery Fund | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Small Cap Discovery Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98% |
| Fidelity Small Cap Discovery Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Mid-Cap Stock Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Mid-Cap Stock Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Mid-Cap Stock Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Mid-Cap Stock Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Mid-Cap Stock Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Mid-Cap Stock Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Mid-Cap Stock Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Mid-Cap Stock Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Mid-Cap Stock Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Fidelity Mid-Cap Stock Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Mid-Cap Stock Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.20% |
| Fidelity Mid-Cap Stock Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Mid-Cap Stock Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| Fidelity Mid-Cap Stock Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Mid-Cap Stock Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Mid-Cap Stock Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Mid-Cap Stock Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Mid-Cap Stock Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.50% |
| Fidelity Mid-Cap Stock Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Mid-Cap Stock Fund | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Mid-Cap Stock Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Mid-Cap Stock Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Mid-Cap Stock Fund | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Mid-Cap Stock Fund | Thailand | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Mid-Cap Stock Fund | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Mid-Cap Stock Fund | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Mid-Cap Stock Fund | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Mid-Cap Stock Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.30% |
| Fidelity Mid-Cap Stock Fund | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Mid-Cap Stock Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Mid-Cap Stock Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Mid-Cap Stock Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Mid-Cap Stock Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Mid-Cap Stock Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Mid-Cap Stock Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Mid-Cap Stock Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Mid-Cap Stock Fund - Class K | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Mid-Cap Stock Fund - Class K | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Mid-Cap Stock Fund - Class K | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Fidelity Mid-Cap Stock Fund - Class K | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Mid-Cap Stock Fund - Class K | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.20% |
| Fidelity Mid-Cap Stock Fund - Class K | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Mid-Cap Stock Fund - Class K | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| Fidelity Mid-Cap Stock Fund - Class K | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Mid-Cap Stock Fund - Class K | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Mid-Cap Stock Fund - Class K | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Mid-Cap Stock Fund - Class K | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Mid-Cap Stock Fund - Class K | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.50% |
| Fidelity Mid-Cap Stock Fund - Class K | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Mid-Cap Stock Fund - Class K | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Mid-Cap Stock Fund - Class K | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Mid-Cap Stock Fund - Class K | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Mid-Cap Stock Fund - Class K | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Mid-Cap Stock Fund - Class K | Thailand | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Mid-Cap Stock Fund - Class K | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Mid-Cap Stock Fund - Class K | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Mid-Cap Stock Fund - Class K | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Mid-Cap Stock Fund - Class K | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.30% |
| Fidelity Mid-Cap Stock Fund - Class K | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Mid-Cap Stock Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Small Cap Stock Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Small Cap Stock Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Small Cap Stock Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Small Cap Stock Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Small Cap Stock Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Small Cap Stock Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Small Cap Stock Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Small Cap Stock Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Small Cap Stock Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Small Cap Stock Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Small Cap Stock Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.80% |
| Fidelity Small Cap Stock Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Small Cap Stock Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| Fidelity Small Cap Stock Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Small Cap Stock Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18% |
| Fidelity Small Cap Stock Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| Fidelity Small Cap Stock Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| Fidelity Small Cap Stock Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Small Cap Stock Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Small Cap Stock Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Small Cap Stock Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Small Cap Stock Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.20% |
| Fidelity Small Cap Stock Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Small Cap Stock Fund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Small Cap Stock Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Small Cap Stock Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Small Cap Stock Fund | Thailand | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Small Cap Stock Fund | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Small Cap Stock Fund | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Small Cap Stock Fund | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Small Cap Stock Fund | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Small Cap Stock Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.60% |
| Fidelity Small Cap Stock Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Large Cap Stock K6 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Large Cap Stock K6 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Large Cap Stock K6 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Fidelity Large Cap Stock K6 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Large Cap Stock K6 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Large Cap Stock K6 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Large Cap Stock K6 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Large Cap Stock K6 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Large Cap Stock K6 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Large Cap Stock K6 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Large Cap Stock K6 Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Large Cap Stock K6 Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| Fidelity Large Cap Stock K6 Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.50% |
| Fidelity Large Cap Stock K6 Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Large Cap Stock K6 Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| Fidelity Large Cap Stock K6 Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Large Cap Stock K6 Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Large Cap Stock K6 Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Large Cap Stock K6 Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.50% |
| Fidelity Large Cap Stock K6 Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.50% |
| Fidelity Large Cap Stock K6 Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Large Cap Stock K6 Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.20% |
| Fidelity Large Cap Stock K6 Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Large Cap Stock K6 Fund | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Large Cap Stock K6 Fund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Large Cap Stock K6 Fund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Large Cap Stock K6 Fund | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Large Cap Stock K6 Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Large Cap Stock K6 Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Large Cap Stock K6 Fund | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Large Cap Stock K6 Fund | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Large Cap Stock K6 Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.70% |
| Fidelity Large Cap Stock K6 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Large Cap Stock Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Large Cap Stock Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Fidelity Large Cap Stock Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Large Cap Stock Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Fidelity Large Cap Stock Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Large Cap Stock Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Large Cap Stock Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Large Cap Stock Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Large Cap Stock Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Large Cap Stock Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Large Cap Stock Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| Fidelity Large Cap Stock Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.40% |
| Fidelity Large Cap Stock Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| Fidelity Large Cap Stock Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Large Cap Stock Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.70% |
| Fidelity Large Cap Stock Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Large Cap Stock Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Large Cap Stock Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Large Cap Stock Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| Fidelity Large Cap Stock Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Large Cap Stock Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Large Cap Stock Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 91.90% |
| Fidelity Large Cap Stock Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Large Cap Stock Fund | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Large Cap Stock Fund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Large Cap Stock Fund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Large Cap Stock Fund | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Large Cap Stock Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Large Cap Stock Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Large Cap Stock Fund | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Large Cap Stock Fund | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Large Cap Stock Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.20% |
| Fidelity Large Cap Stock Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Thailand | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mid-Cap Stock Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Thailand | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mid-Cap Stock Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Founders Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Founders Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Founders Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Founders Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Founders Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Founders Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Founders Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Founders Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Founders Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Founders Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Founders Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.90% |
| Fidelity Founders Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.50% |
| Fidelity Founders Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Founders Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Founders Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Founders Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Founders Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Founders Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Founders Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| Fidelity Founders Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Founders Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89% |
| Fidelity Founders Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Founders Fund | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Founders Fund | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Founders Fund | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Founders Fund | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Founders Fund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Founders Fund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Founders Fund | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Founders Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Founders Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.70% |
| Fidelity Founders Fund | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Founders Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Thailand | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.30% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mid-Cap Stock Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Series Small Cap Core Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Series Small Cap Core Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Series Small Cap Core Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Series Small Cap Core Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Series Small Cap Core Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Series Small Cap Core Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Series Small Cap Core Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Series Small Cap Core Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Series Small Cap Core Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Series Small Cap Core Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Series Small Cap Core Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.20% |
| Fidelity Series Small Cap Core Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.40% |
| Fidelity Series Small Cap Core Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.90% |
| Fidelity Series Small Cap Core Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Fidelity Series Small Cap Core Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.50% |
| Fidelity Series Small Cap Core Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Series Small Cap Core Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Series Small Cap Core Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Series Small Cap Core Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Series Small Cap Core Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Series Small Cap Core Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Series Small Cap Core Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.70% |
| Fidelity Series Small Cap Core Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Series Small Cap Core Fund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Series Small Cap Core Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Series Small Cap Core Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Series Small Cap Core Fund | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Series Small Cap Core Fund | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Series Small Cap Core Fund | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Series Small Cap Core Fund | BahamasNassauMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Series Small Cap Core Fund | Cameroon | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Series Small Cap Core Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.20% |
| Fidelity Series Small Cap Core Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Mid-Cap Stock K6 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Mid-Cap Stock K6 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Mid-Cap Stock K6 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Mid-Cap Stock K6 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Mid-Cap Stock K6 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Mid-Cap Stock K6 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock K6 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock K6 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock K6 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock K6 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Mid-Cap Stock K6 Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| Fidelity Mid-Cap Stock K6 Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| Fidelity Mid-Cap Stock K6 Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity Mid-Cap Stock K6 Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| Fidelity Mid-Cap Stock K6 Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.30% |
| Fidelity Mid-Cap Stock K6 Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| Fidelity Mid-Cap Stock K6 Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| Fidelity Mid-Cap Stock K6 Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Mid-Cap Stock K6 Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Mid-Cap Stock K6 Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Mid-Cap Stock K6 Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Mid-Cap Stock K6 Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.30% |
| Fidelity Mid-Cap Stock K6 Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Mid-Cap Stock K6 Fund | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Mid-Cap Stock K6 Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Mid-Cap Stock K6 Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Mid-Cap Stock K6 Fund | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Mid-Cap Stock K6 Fund | Thailand | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Mid-Cap Stock K6 Fund | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Mid-Cap Stock K6 Fund | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Mid-Cap Stock K6 Fund | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Mid-Cap Stock K6 Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 96.60% |
| Fidelity Mid-Cap Stock K6 Fund | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Mid-Cap Stock K6 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Small Cap Stock K6 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Small Cap Stock K6 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Small Cap Stock K6 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Small Cap Stock K6 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Small Cap Stock K6 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Small Cap Stock K6 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Small Cap Stock K6 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Small Cap Stock K6 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Small Cap Stock K6 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Small Cap Stock K6 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Small Cap Stock K6 Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.40% |
| Fidelity Small Cap Stock K6 Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| Fidelity Small Cap Stock K6 Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.70% |
| Fidelity Small Cap Stock K6 Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Small Cap Stock K6 Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.60% |
| Fidelity Small Cap Stock K6 Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Small Cap Stock K6 Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| Fidelity Small Cap Stock K6 Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Small Cap Stock K6 Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Small Cap Stock K6 Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Small Cap Stock K6 Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Small Cap Stock K6 Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89.10% |
| Fidelity Small Cap Stock K6 Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Small Cap Stock K6 Fund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Small Cap Stock K6 Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Small Cap Stock K6 Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Small Cap Stock K6 Fund | Thailand | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Small Cap Stock K6 Fund | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Small Cap Stock K6 Fund | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Small Cap Stock K6 Fund | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Small Cap Stock K6 Fund | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Small Cap Stock K6 Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 99.60% |
| Fidelity Small Cap Stock K6 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Advisor Founders Fund - Class M | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Advisor Founders Fund - Class M | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Advisor Founders Fund - Class M | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Advisor Founders Fund - Class M | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Founders Fund - Class M | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Founders Fund - Class M | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Advisor Founders Fund - Class M | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor Founders Fund - Class M | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor Founders Fund - Class M | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor Founders Fund - Class M | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Founders Fund - Class M | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.90% |
| Fidelity Advisor Founders Fund - Class M | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.50% |
| Fidelity Advisor Founders Fund - Class M | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Advisor Founders Fund - Class M | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Founders Fund - Class M | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Advisor Founders Fund - Class M | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Founders Fund - Class M | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Advisor Founders Fund - Class M | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class M | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| Fidelity Advisor Founders Fund - Class M | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Founders Fund - Class M | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89% |
| Fidelity Advisor Founders Fund - Class M | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Advisor Founders Fund - Class M | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Founders Fund - Class M | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Founders Fund - Class M | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Founders Fund - Class M | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Founders Fund - Class M | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class M | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class M | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class M | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class M | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.70% |
| Fidelity Advisor Founders Fund - Class M | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Advisor Founders Fund - Class A | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Advisor Founders Fund - Class A | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Advisor Founders Fund - Class A | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Advisor Founders Fund - Class A | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Advisor Founders Fund - Class A | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Founders Fund - Class A | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Advisor Founders Fund - Class A | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Advisor Founders Fund - Class A | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Advisor Founders Fund - Class A | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Advisor Founders Fund - Class A | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Founders Fund - Class A | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.90% |
| Fidelity Advisor Founders Fund - Class A | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.50% |
| Fidelity Advisor Founders Fund - Class A | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Advisor Founders Fund - Class A | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Founders Fund - Class A | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Advisor Founders Fund - Class A | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Founders Fund - Class A | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Advisor Founders Fund - Class A | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class A | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| Fidelity Advisor Founders Fund - Class A | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Advisor Founders Fund - Class A | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 89% |
| Fidelity Advisor Founders Fund - Class A | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Advisor Founders Fund - Class A | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Advisor Founders Fund - Class A | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Advisor Founders Fund - Class A | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Founders Fund - Class A | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Founders Fund - Class A | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class A | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class A | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class A | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Advisor Founders Fund - Class A | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.70% |
| Fidelity Advisor Founders Fund - Class A | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Advisor Founders Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
