Shareholder Report
|
6 Months Ended |
|
Aug. 31, 2026
USD ($)
Holding
|
|---|
| Shareholder Report [Line Items] |
|
|
| Document Type |
N-CSRS
|
|
| Amendment Flag |
false
|
|
| Registrant Name |
AMCAP Fund
|
|
| Entity Central Index Key |
0000004405
|
|
| Entity Investment Company Type |
N-1A
|
|
| Document Period End Date |
Aug. 31, 2026
|
|
| AMCAP Fund® - Class A |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class A
|
|
| Trading Symbol |
AMCPX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-A. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-A
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class A | $ 33 | 0.63 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 33
|
|
| Expense Ratio, Percent |
0.63%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class C |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class C
|
|
| Trading Symbol |
AMPCX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-C. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-C
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class C | $ 72 | 1.37 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 72
|
|
| Expense Ratio, Percent |
1.37%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class F-1 |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class F-1
|
|
| Trading Symbol |
AMPFX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-F1. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-F1
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class F-1 | $ 36 | 0.69 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 36
|
|
| Expense Ratio, Percent |
0.69%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class F-2 |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class F-2
|
|
| Trading Symbol |
AMCFX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-F2. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-F2
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class F-2 | $ 23 | 0.44 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 23
|
|
| Expense Ratio, Percent |
0.44%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class F-3 |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class F-3
|
|
| Trading Symbol |
FMACX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-F3. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-F3
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class F-3 | $ 17 | 0.33 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 17
|
|
| Expense Ratio, Percent |
0.33%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class 529-A |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class 529-A
|
|
| Trading Symbol |
CAFAX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-529A. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-529A
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class 529-A | $ 35 | 0.66 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 35
|
|
| Expense Ratio, Percent |
0.66%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class 529-C |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class 529-C
|
|
| Trading Symbol |
CAFCX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-529C. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-529C
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class 529-C | $ 76 | 1.44 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 76
|
|
| Expense Ratio, Percent |
1.44%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class 529-E |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class 529-E
|
|
| Trading Symbol |
CAFEX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-529E. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-529E
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class 529-E | $ 48 | 0.91 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 48
|
|
| Expense Ratio, Percent |
0.91%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class 529-F-2 |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class 529-F-2
|
|
| Trading Symbol |
FMMMX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-529F2. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-529F2
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class 529-F-2 | $ 22 | 0.42 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 22
|
|
| Expense Ratio, Percent |
0.42%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class 529-F-3 |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class 529-F-3
|
|
| Trading Symbol |
FMCMX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-529F3. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-529F3
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class 529-F-3 | $ 20 | 0.38 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 20
|
|
| Expense Ratio, Percent |
0.38%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class R-1 |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class R-1
|
|
| Trading Symbol |
RAFAX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R1. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-R1
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class R-1 | $ 74 | 1.41 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 74
|
|
| Expense Ratio, Percent |
1.41%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class R-2 |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class R-2
|
|
| Trading Symbol |
RAFBX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R2. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-R2
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class R-2 | $ 74 | 1.41 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 74
|
|
| Expense Ratio, Percent |
1.41%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class R-2E |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class R-2E
|
|
| Trading Symbol |
RAEBX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R2E. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-R2E
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class R-2E | $ 59 | 1.12 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 59
|
|
| Expense Ratio, Percent |
1.12%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class R-3 |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class R-3
|
|
| Trading Symbol |
RAFCX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R3. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
|
|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-R3
|
|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class R-3 | $ 51 | 0.97 % * |
*Annualized.
|
|
| Expenses Paid, Amount |
$ 51
|
|
| Expense Ratio, Percent |
0.97%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class R-4 |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
AMCAP Fund®
|
|
| Class Name |
Class R-4
|
|
| Trading Symbol |
RAFEX
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| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
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| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
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| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R4. You can also request this information by contacting us at (800) 421-4225.
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| Additional Information Phone Number |
(800) 421-4225
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| Additional Information Website |
capitalgroup.com/mutual-fund-literature-R4
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| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class R-4 | $ 35 | 0.67 % * |
*Annualized.
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| Expenses Paid, Amount |
$ 35
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| Expense Ratio, Percent |
0.67%
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[1] |
| Net Assets |
$ 94,476,000,000
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| Holdings Count | Holding |
113
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| Investment Company, Portfolio Turnover |
14.00%
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| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
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| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
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| AMCAP Fund® - Class R-5E |
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| Shareholder Report [Line Items] |
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| Fund Name |
AMCAP Fund®
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| Class Name |
Class R-5E
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| Trading Symbol |
RAEFX
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|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R5E. You can also request this information by contacting us at (800) 421-4225.
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| Additional Information Phone Number |
(800) 421-4225
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| Additional Information Website |
capitalgroup.com/mutual-fund-literature-R5E
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|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class R-5E | $ 25 | 0.47 % * |
*Annualized.
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| Expenses Paid, Amount |
$ 25
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| Expense Ratio, Percent |
0.47%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class R-5 |
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|
| Shareholder Report [Line Items] |
|
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| Fund Name |
AMCAP Fund®
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| Class Name |
Class R-5
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| Trading Symbol |
RAFFX
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|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R5. You can also request this information by contacting us at (800) 421-4225.
|
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| Additional Information Phone Number |
(800) 421-4225
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|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-R5
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|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class R-5 | $ 20 | 0.38 % * |
*Annualized.
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| Expenses Paid, Amount |
$ 20
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| Expense Ratio, Percent |
0.38%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
| AMCAP Fund® - Class R-6 |
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| Shareholder Report [Line Items] |
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| Fund Name |
AMCAP Fund®
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| Class Name |
Class R-6
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| Trading Symbol |
RAFGX
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|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about AMCAP Fund (the "fund") for the period from March 1, 2026 to August 31, 2026.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the fund at capitalgroup.com/mutual-fund-literature-R6. You can also request this information by contacting us at (800) 421-4225.
|
|
| Additional Information Phone Number |
(800) 421-4225
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|
| Additional Information Website |
capitalgroup.com/mutual-fund-literature-R6
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|
| Expenses [Text Block] |
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment) | Share class | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment | | Class R-6 | $ 17 | 0.33 % * |
*Annualized.
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| Expenses Paid, Amount |
$ 17
|
|
| Expense Ratio, Percent |
0.33%
|
[1] |
| Net Assets |
$ 94,476,000,000
|
|
| Holdings Count | Holding |
113
|
|
| Investment Company, Portfolio Turnover |
14.00%
|
|
| Additional Fund Statistics [Text Block] |
Key fund statistics | Fund net assets (in millions) | $ 94,476 | | Total number of portfolio holdings | 113 | | Portfolio turnover rate | 14 % |
|
|
| Holdings [Text Block] |
Portfolio holdings by sector (percent of net assets) 
|
|
|
|