| Form N-CSR Cover | 12 Months Ended |
| Jul. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | AB DISCOVERY GROWTH FUND, INC. |
| Entity Central Index Key | 0000019614 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Jul. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | AB DISCOVERY GROWTH FUND, INC. |
| Entity Central Index Key | 0000019614 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
| C000028070 | |
| Shareholder Report [Line Items] | |
| Fund Name | AB Discovery Growth Fund |
| Class Name | Advisor Class |
| Trading Symbol | CHCYX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Discovery Growth Fund (the “Fund”) for the period of August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/CHCYX-A. You can also request this information by contacting us at (800) 227 4618. |
| Additional Information Phone Number | (800) 227 4618 |
| Additional Information Website | https://www.abfunds.com/link/AB/CHCYX-A |
| Expenses [Text Block] | What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Advisor Class $73 0.69% |
| Expenses Paid, Amount | $ 73 |
| Expense Ratio, Percent | 0.69% |
| Performance Past Does Not Indicate Future [Text] | |
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Advisor Class (without sales charges) 11.71 % 7.11 % 10.03 % Advisor Class (with sales charges) 11.71 % 7.11 % 10.03 % S&P 500 Index 22.15 % 15.00 % 13.15 % Russell 2500 Growth Index 11.93 % 8.52 % 9.98 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares. |
| AssetsNet | $ 2,660,015,184 |
| Holdings Count | Holding | 88 |
| Advisory Fees Paid, Amount | $ 16,035,235 |
| InvestmentCompanyPortfolioTurnover | 79% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $2,660,015,184 # of Portfolio Holdings 88 Portfolio Turnover Rate 79% Total Advisory Fees Paid $16,035,235 |
| Holdings [Text Block] | Sector Allocation Value Value Industrials 26.0% Information Technology 22.3% Health Care 19.6% Consumer Discretionary 12.8% Financials 6.8% Consumer Staples 4.3% Energy 3.3% Investment Companies 1.7% Real Estate 1.0% Short-Term Investments 5.3% Other assets less liabilities - |
| Largest Holdings [Text Block] | 10 Top Holdings Company U.S. $ Value % of Net Assets Lennox International, Inc. $59,201,327 2.2 % Manhattan Associates, Inc. $57,331,788 2.2 % Pure Storage, Inc. - Class A $51,333,042 1.9 % Natera, Inc. $50,170,281 1.9 % XPO, Inc. $49,684,985 1.9 % TechnipFMC PLC $47,826,285 1.8 % Comfort Systems USA, Inc. $46,043,494 1.7 % Ryan Specialty Holdings, Inc. $45,200,901 1.7 % iShares Russell 2000 Growth ETF $44,516,977 1.7 % Universal Display Corp. $43,378,620 1.6 % Total $494,687,700 18.6 % |
| Material Fund Change [Text Block] | |
| C000028067 | |
| Shareholder Report [Line Items] | |
| Fund Name | AB Discovery Growth Fund |
| Class Name | Class A |
| Trading Symbol | CHCLX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Discovery Growth Fund (the “Fund”) for the period of August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/CHCLX-A. You can also request this information by contacting us at (800) 227 4618. |
| Additional Information Phone Number | (800) 227 4618 |
| Additional Information Website | https://www.abfunds.com/link/AB/CHCLX-A |
| Expenses [Text Block] | What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $97 0.92% |
| Expenses Paid, Amount | $ 97 |
| Expense Ratio, Percent | 0.92% |
| Performance Past Does Not Indicate Future [Text] | |
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class A (without sales charges) 11.51 % 6.88 % 9.78 % Class A (with sales charges) 6.73 % 5.95 % 9.30 % S&P 500 Index 22.15 % 15.00 % 13.15 % Russell 2500 Growth Index 11.93 % 8.52 % 9.98 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares. |
| AssetsNet | $ 2,660,015,184 |
| Holdings Count | Holding | 88 |
| Advisory Fees Paid, Amount | $ 16,035,235 |
| InvestmentCompanyPortfolioTurnover | 79% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $2,660,015,184 # of Portfolio Holdings 88 Portfolio Turnover Rate 79% Total Advisory Fees Paid $16,035,235 |
| Holdings [Text Block] | Sector Allocation Value Value Industrials 26.0% Information Technology 22.3% Health Care 19.6% Consumer Discretionary 12.8% Financials 6.8% Consumer Staples 4.3% Energy 3.3% Investment Companies 1.7% Real Estate 1.0% Short-Term Investments 5.3% Other assets less liabilities - |
| Largest Holdings [Text Block] | 10 Top Holdings Company U.S. $ Value % of Net Assets Lennox International, Inc. $59,201,327 2.2 % Manhattan Associates, Inc. $57,331,788 2.2 % Pure Storage, Inc. - Class A $51,333,042 1.9 % Natera, Inc. $50,170,281 1.9 % XPO, Inc. $49,684,985 1.9 % TechnipFMC PLC $47,826,285 1.8 % Comfort Systems USA, Inc. $46,043,494 1.7 % Ryan Specialty Holdings, Inc. $45,200,901 1.7 % iShares Russell 2000 Growth ETF $44,516,977 1.7 % Universal Display Corp. $43,378,620 1.6 % Total $494,687,700 18.6 % |
| Material Fund Change [Text Block] | |
| C000028069 | |
| Shareholder Report [Line Items] | |
| Fund Name | AB Discovery Growth Fund |
| Class Name | Class C |
| Trading Symbol | CHCCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Discovery Growth Fund (the “Fund”) for the period of August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/CHCCX-A. You can also request this information by contacting us at (800) 227 4618. |
| Additional Information Phone Number | (800) 227 4618 |
| Additional Information Website | https://www.abfunds.com/link/AB/CHCCX-A |
| Expenses [Text Block] | What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $179 1.70% |
| Expenses Paid, Amount | $ 179 |
| Expense Ratio, Percent | 1.70% |
| Performance Past Does Not Indicate Future [Text] | |
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class C (without sales charges) 10.40 % 6.04 % 8.92 % Class C (with sales charges) 9.40 % 6.04 % 8.92 % S&P 500 Index 22.15 % 15.00 % 13.15 % Russell 2500 Growth Index 11.93 % 8.52 % 9.98 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares. |
| AssetsNet | $ 2,660,015,184 |
| Holdings Count | Holding | 88 |
| Advisory Fees Paid, Amount | $ 16,035,235 |
| InvestmentCompanyPortfolioTurnover | 79% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $2,660,015,184 # of Portfolio Holdings 88 Portfolio Turnover Rate 79% Total Advisory Fees Paid $16,035,235 |
| Holdings [Text Block] | Sector Allocation Value Value Industrials 26.0% Information Technology 22.3% Health Care 19.6% Consumer Discretionary 12.8% Financials 6.8% Consumer Staples 4.3% Energy 3.3% Investment Companies 1.7% Real Estate 1.0% Short-Term Investments 5.3% Other assets less liabilities - |
| Largest Holdings [Text Block] | 10 Top Holdings Company U.S. $ Value % of Net Assets Lennox International, Inc. $59,201,327 2.2 % Manhattan Associates, Inc. $57,331,788 2.2 % Pure Storage, Inc. - Class A $51,333,042 1.9 % Natera, Inc. $50,170,281 1.9 % XPO, Inc. $49,684,985 1.9 % TechnipFMC PLC $47,826,285 1.8 % Comfort Systems USA, Inc. $46,043,494 1.7 % Ryan Specialty Holdings, Inc. $45,200,901 1.7 % iShares Russell 2000 Growth ETF $44,516,977 1.7 % Universal Display Corp. $43,378,620 1.6 % Total $494,687,700 18.6 % |
| Material Fund Change [Text Block] | |
| C000028073 | |
| Shareholder Report [Line Items] | |
| Fund Name | AB Discovery Growth Fund |
| Class Name | Class I |
| Trading Symbol | CHCIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Discovery Growth Fund (the “Fund”) for the period of August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/CHCIX-A. You can also request this information by contacting us at (800) 227 4618. |
| Additional Information Phone Number | (800) 227 4618 |
| Additional Information Website | https://www.abfunds.com/link/AB/CHCIX-A |
| Expenses [Text Block] | What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $79 0.75% |
| Expenses Paid, Amount | $ 79 |
| Expense Ratio, Percent | 0.75% |
| Performance Past Does Not Indicate Future [Text] | |
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class I (without sales charges) 11.65 % 7.08 % 10.00 % Class I (with sales charges) 11.65 % 7.08 % 10.00 % S&P 500 Index 22.15 % 15.00 % 13.15 % Russell 2500 Growth Index 11.93 % 8.52 % 9.98 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares. |
| AssetsNet | $ 2,660,015,184 |
| Holdings Count | Holding | 88 |
| Advisory Fees Paid, Amount | $ 16,035,235 |
| InvestmentCompanyPortfolioTurnover | 79% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $2,660,015,184 # of Portfolio Holdings 88 Portfolio Turnover Rate 79% Total Advisory Fees Paid $16,035,235 |
| Holdings [Text Block] | Sector Allocation Value Value Industrials 26.0% Information Technology 22.3% Health Care 19.6% Consumer Discretionary 12.8% Financials 6.8% Consumer Staples 4.3% Energy 3.3% Investment Companies 1.7% Real Estate 1.0% Short-Term Investments 5.3% Other assets less liabilities - |
| Largest Holdings [Text Block] | 10 Top Holdings Company U.S. $ Value % of Net Assets Lennox International, Inc. $59,201,327 2.2 % Manhattan Associates, Inc. $57,331,788 2.2 % Pure Storage, Inc. - Class A $51,333,042 1.9 % Natera, Inc. $50,170,281 1.9 % XPO, Inc. $49,684,985 1.9 % TechnipFMC PLC $47,826,285 1.8 % Comfort Systems USA, Inc. $46,043,494 1.7 % Ryan Specialty Holdings, Inc. $45,200,901 1.7 % iShares Russell 2000 Growth ETF $44,516,977 1.7 % Universal Display Corp. $43,378,620 1.6 % Total $494,687,700 18.6 % |
| Material Fund Change [Text Block] | |
| C000144785 | |
| Shareholder Report [Line Items] | |
| Fund Name | AB Discovery Growth Fund |
| Class Name | Class Z |
| Trading Symbol | CHCZX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Discovery Growth Fund (the “Fund”) for the period of August 1, 2023 to July 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/CHCZX-A. You can also request this information by contacting us at (800) 227 4618. |
| Additional Information Phone Number | (800) 227 4618 |
| Additional Information Website | https://www.abfunds.com/link/AB/CHCZX-A |
| Expenses [Text Block] | What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class Z $70 0.66% |
| Expenses Paid, Amount | $ 70 |
| Expense Ratio, Percent | 0.66% |
| Performance Past Does Not Indicate Future [Text] | |
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class Z (without sales charges) 11.75 % 7.17 % 10.08 % Class Z (with sales charges) 11.75 % 7.17 % 10.08 % S&P 500 Index 22.15 % 15.00 % 13.15 % Russell 2500 Growth Index 11.93 % 8.52 % 9.98 % |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares. |
| AssetsNet | $ 2,660,015,184 |
| Holdings Count | Holding | 88 |
| Advisory Fees Paid, Amount | $ 16,035,235 |
| InvestmentCompanyPortfolioTurnover | 79% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $2,660,015,184 # of Portfolio Holdings 88 Portfolio Turnover Rate 79% Total Advisory Fees Paid $16,035,235 |
| Holdings [Text Block] | Sector Allocation Value Value Industrials 26.0% Information Technology 22.3% Health Care 19.6% Consumer Discretionary 12.8% Financials 6.8% Consumer Staples 4.3% Energy 3.3% Investment Companies 1.7% Real Estate 1.0% Short-Term Investments 5.3% Other assets less liabilities - |
| Largest Holdings [Text Block] | 10 Top Holdings Company U.S. $ Value % of Net Assets Lennox International, Inc. $59,201,327 2.2 % Manhattan Associates, Inc. $57,331,788 2.2 % Pure Storage, Inc. - Class A $51,333,042 1.9 % Natera, Inc. $50,170,281 1.9 % XPO, Inc. $49,684,985 1.9 % TechnipFMC PLC $47,826,285 1.8 % Comfort Systems USA, Inc. $46,043,494 1.7 % Ryan Specialty Holdings, Inc. $45,200,901 1.7 % iShares Russell 2000 Growth ETF $44,516,977 1.7 % Universal Display Corp. $43,378,620 1.6 % Total $494,687,700 18.6 % |
| Material Fund Change [Text Block] |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | ||||||||||
| Jul. 31, 2024 | Jul. 31, 2023 | Jul. 31, 2022 | Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014 | |
| C000028070 | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Advisor Class | ||||||||||
| Account Value | $ 26,001 | $ 23,275 | $ 21,933 | $ 30,336 | $ 22,063 | $ 18,440 | $ 16,801 | $ 12,830 | $ 10,818 | $ 11,598 | $ 10,000 |
| C000028067 | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Class A | ||||||||||
| Account Value | $ 24,330 | 21,819 | 20,619 | 28,566 | 20,833 | 17,447 | 15,928 | 12,199 | 10,302 | 11,065 | 9,570 |
| C000028069 | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||
| Account Value | $ 23,508 | 21,293 | 20,246 | 28,293 | 20,769 | 17,537 | 16,130 | 12,455 | 10,599 | 11,487 | 10,000 |
| C000028073 | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||
| Account Value | $ 25,949 | 23,241 | 21,919 | 30,314 | 22,051 | 18,430 | 16,793 | 12,832 | 10,826 | 11,590 | 10,000 |
| C000144785 | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Class Z | ||||||||||
| Account Value | $ 26,129 | 23,382 | 22,019 | 30,448 | 22,135 | 18,483 | 16,829 | 12,856 | 10,826 | 11,601 | 10,000 |
| AllianceBernstein Index: S&P 500 Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | ||||||||||
| Account Value | $ 34,403 | 28,165 | 24,921 | 26,134 | 19,153 | 17,108 | 15,843 | 13,629 | 11,745 | 11,121 | 10,000 |
| AllianceBernstein Index: S&P 500 Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | ||||||||||
| Account Value | $ 34,403 | 28,165 | 24,921 | 26,134 | 19,153 | 17,108 | 15,843 | 13,629 | 11,745 | 11,121 | 10,000 |
| AllianceBernstein Index: S&P 500 Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | ||||||||||
| Account Value | $ 34,403 | 28,165 | 24,921 | 26,134 | 19,153 | 17,108 | 15,843 | 13,629 | 11,745 | 11,121 | 10,000 |
| AllianceBernstein Index: S&P 500 Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | ||||||||||
| Account Value | $ 34,403 | 28,165 | 24,921 | 26,134 | 19,153 | 17,108 | 15,843 | 13,629 | 11,745 | 11,121 | 10,000 |
| AllianceBernstein Index: S&P 500 Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | ||||||||||
| Account Value | $ 34,403 | 28,165 | 24,921 | 26,134 | 19,153 | 17,108 | 15,843 | 13,629 | 11,745 | 11,121 | 10,000 |
| Alliance Bernstein Index: Russell 2500 Growth Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Russell 2500 Growth Index | ||||||||||
| Account Value | $ 25,902 | 23,142 | 21,039 | 27,093 | 19,520 | 17,210 | 16,265 | 13,312 | 11,461 | 11,859 | 10,000 |
| Alliance Bernstein Index: Russell 2500 Growth Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Russell 2500 Growth Index | ||||||||||
| Account Value | $ 25,902 | 23,142 | 21,039 | 27,093 | 19,520 | 17,210 | 16,265 | 13,312 | 11,461 | 11,859 | 10,000 |
| Alliance Bernstein Index: Russell 2500 Growth Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Russell 2500 Growth Index | ||||||||||
| Account Value | $ 25,902 | 23,142 | 21,039 | 27,093 | 19,520 | 17,210 | 16,265 | 13,312 | 11,461 | 11,859 | 10,000 |
| Alliance Bernstein Index: Russell 2500 Growth Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Russell 2500 Growth Index | ||||||||||
| Account Value | $ 25,902 | 23,142 | 21,039 | 27,093 | 19,520 | 17,210 | 16,265 | 13,312 | 11,461 | 11,859 | 10,000 |
| Alliance Bernstein Index: Russell 2500 Growth Index | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Russell 2500 Growth Index | ||||||||||
| Account Value | $ 25,902 | $ 23,142 | $ 21,039 | $ 27,093 | $ 19,520 | $ 17,210 | $ 16,265 | $ 13,312 | $ 11,461 | $ 11,859 | $ 10,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 120 Months Ended |
| Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | |
| C000028070 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Advisor Class | ||
| Average Annual Return, Percent | 11.71% | 7.11% | 10.03% |
| C000028067 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class A | ||
| Average Annual Return, Percent | 6.73% | 5.95% | 9.30% |
| C000028069 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class C | ||
| Average Annual Return, Percent | 9.40% | 6.04% | 8.92% |
| C000028073 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class I | ||
| Average Annual Return, Percent | 11.65% | 7.08% | 10% |
| C000144785 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class Z | ||
| Average Annual Return, Percent | 11.75% | 7.17% | 10.08% |
| Without Sales Load [Member] | C000028070 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 11.71% | 7.11% | 10.03% |
| Without Sales Load [Member] | C000028067 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 11.51% | 6.88% | 9.78% |
| Without Sales Load [Member] | C000028069 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 10.40% | 6.04% | 8.92% |
| Without Sales Load [Member] | C000028073 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 11.65% | 7.08% | 10% |
| Without Sales Load [Member] | C000144785 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 11.75% | 7.17% | 10.08% |
| AllianceBernstein Index: S&P 500 Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | S&P 500 Index | ||
| Average Annual Return, Percent | 22.15% | 15% | 13.15% |
| AllianceBernstein Index: S&P 500 Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | S&P 500 Index | ||
| Average Annual Return, Percent | 22.15% | 15% | 13.15% |
| AllianceBernstein Index: S&P 500 Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | S&P 500 Index | ||
| Average Annual Return, Percent | 22.15% | 15% | 13.15% |
| AllianceBernstein Index: S&P 500 Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | S&P 500 Index | ||
| Average Annual Return, Percent | 22.15% | 15% | 13.15% |
| AllianceBernstein Index: S&P 500 Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | S&P 500 Index | ||
| Average Annual Return, Percent | 22.15% | 15% | 13.15% |
| Alliance Bernstein Index: Russell 2500 Growth Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 2500 Growth Index | ||
| Average Annual Return, Percent | 11.93% | 8.52% | 9.98% |
| Alliance Bernstein Index: Russell 2500 Growth Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 2500 Growth Index | ||
| Average Annual Return, Percent | 11.93% | 8.52% | 9.98% |
| Alliance Bernstein Index: Russell 2500 Growth Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 2500 Growth Index | ||
| Average Annual Return, Percent | 11.93% | 8.52% | 9.98% |
| Alliance Bernstein Index: Russell 2500 Growth Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 2500 Growth Index | ||
| Average Annual Return, Percent | 11.93% | 8.52% | 9.98% |
| Alliance Bernstein Index: Russell 2500 Growth Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 2500 Growth Index | ||
| Average Annual Return, Percent | 11.93% | 8.52% | 9.98% |
| Shareholder Report, Holdings (Details) | Jul. 31, 2024 |
| C000028070 | Lennox International, Inc.FR_526107107 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028070 | Manhattan Associates, Inc.FR_562750109 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028070 | Pure Storage, Inc.FR_74624M102 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028070 | Natera, Inc.FR_632307104 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028070 | XPO, Inc.FR_983793100 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028070 | TechnipFMC PLCFR_G87110105 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000028070 | Comfort Systems USA, Inc.FR_199908104 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028070 | Ryan Specialty Holdings, Inc.FR_78351F107 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028070 | iShares Russell 2000 Growth ETFFR_464287648 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028070 | Universal Display Corp.FR_91347P105 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000028070 | SectorIndustrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26% |
| C000028070 | SectorInformation Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.30% |
| C000028070 | SectorHealth Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.60% |
| C000028070 | SectorConsumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| C000028070 | SectorFinancials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000028070 | SectorConsumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000028070 | SectorEnergy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000028070 | SectorInvestment Companies | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028070 | SectorReal Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000028070 | SectorShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000028070 | Sector Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (3.10%) |
| C000028067 | Lennox International, Inc.FR_526107107 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028067 | Manhattan Associates, Inc.FR_562750109 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028067 | Pure Storage, Inc.FR_74624M102 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028067 | Natera, Inc.FR_632307104 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028067 | XPO, Inc.FR_983793100 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028067 | TechnipFMC PLCFR_G87110105 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000028067 | Comfort Systems USA, Inc.FR_199908104 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028067 | Ryan Specialty Holdings, Inc.FR_78351F107 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028067 | iShares Russell 2000 Growth ETFFR_464287648 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028067 | Universal Display Corp.FR_91347P105 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000028067 | SectorIndustrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26% |
| C000028067 | SectorInformation Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.30% |
| C000028067 | SectorHealth Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.60% |
| C000028067 | SectorConsumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| C000028067 | SectorFinancials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000028067 | SectorConsumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000028067 | SectorEnergy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000028067 | SectorInvestment Companies | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028067 | SectorReal Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000028067 | SectorShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000028067 | Sector Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (3.10%) |
| C000028069 | Lennox International, Inc.FR_526107107 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028069 | Manhattan Associates, Inc.FR_562750109 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028069 | Pure Storage, Inc.FR_74624M102 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028069 | Natera, Inc.FR_632307104 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028069 | XPO, Inc.FR_983793100 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028069 | TechnipFMC PLCFR_G87110105 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000028069 | Comfort Systems USA, Inc.FR_199908104 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028069 | Ryan Specialty Holdings, Inc.FR_78351F107 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028069 | iShares Russell 2000 Growth ETFFR_464287648 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028069 | Universal Display Corp.FR_91347P105 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000028069 | SectorIndustrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26% |
| C000028069 | SectorInformation Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.30% |
| C000028069 | SectorHealth Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.60% |
| C000028069 | SectorConsumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| C000028069 | SectorFinancials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000028069 | SectorConsumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000028069 | SectorEnergy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000028069 | SectorInvestment Companies | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028069 | SectorReal Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000028069 | SectorShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000028069 | Sector Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (3.10%) |
| C000028073 | Lennox International, Inc.FR_526107107 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028073 | Manhattan Associates, Inc.FR_562750109 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000028073 | Pure Storage, Inc.FR_74624M102 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028073 | Natera, Inc.FR_632307104 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028073 | XPO, Inc.FR_983793100 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000028073 | TechnipFMC PLCFR_G87110105 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000028073 | Comfort Systems USA, Inc.FR_199908104 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028073 | Ryan Specialty Holdings, Inc.FR_78351F107 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028073 | iShares Russell 2000 Growth ETFFR_464287648 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028073 | Universal Display Corp.FR_91347P105 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000028073 | SectorIndustrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26% |
| C000028073 | SectorInformation Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.30% |
| C000028073 | SectorHealth Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.60% |
| C000028073 | SectorConsumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| C000028073 | SectorFinancials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000028073 | SectorConsumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000028073 | SectorEnergy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000028073 | SectorInvestment Companies | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000028073 | SectorReal Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000028073 | SectorShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000028073 | Sector Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (3.10%) |
| C000144785 | Lennox International, Inc.FR_526107107 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000144785 | Manhattan Associates, Inc.FR_562750109 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000144785 | Pure Storage, Inc.FR_74624M102 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000144785 | Natera, Inc.FR_632307104 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000144785 | XPO, Inc.FR_983793100 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000144785 | TechnipFMC PLCFR_G87110105 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000144785 | Comfort Systems USA, Inc.FR_199908104 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000144785 | Ryan Specialty Holdings, Inc.FR_78351F107 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000144785 | iShares Russell 2000 Growth ETFFR_464287648 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000144785 | Universal Display Corp.FR_91347P105 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000144785 | SectorIndustrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26% |
| C000144785 | SectorInformation Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.30% |
| C000144785 | SectorHealth Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.60% |
| C000144785 | SectorConsumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.80% |
| C000144785 | SectorFinancials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| C000144785 | SectorConsumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| C000144785 | SectorEnergy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000144785 | SectorInvestment Companies | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| C000144785 | SectorReal Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000144785 | SectorShort-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000144785 | Sector Other Net Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (3.10%) |
