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Shareholder Report
 6 Months Ended
Jun. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Alger ETF Trust
Entity Central Index Key 0001807486
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
C000222788 [Member]  
Shareholder Report [Line Items]  
Fund Name Alger Mid Cap 40 ETF
Class Name Alger Mid Cap 40 ETF
Trading Symbol FRTY
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Alger Mid Cap 40 ETF (“Fund”) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.alger.com/fundliterature. You can also request a copy of the semi-annual report by contacting us at (800) 223-3810.
Additional Information Phone Number (800) 223-3810
Additional Information Website www.alger.com/fundliterature
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Alger Mid Cap 40 ETF $30 0.60%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.60% [1]
Net Assets $ 100,056,179
Holdings Count | Holding 40 [2]
Investment Company Portfolio Turnover 206.00%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics as of the fiscal six-month period ended June 30, 2025.
Fund net assets $100,056,179
Total number of portfolio holdings1 40
Portfolio turnover rate 206.00%
1
Excludes Money Market Funds.
Holdings [Text Block]
Sector Allocation †
Equities
Communication Services 11.3%
Consumer Discretionary 7.9%
Consumer Staples 1.0%
Financials 6.9%
Health Care 10.1%
Industrials 16.1%
Information Technology 27.6%
Utilities 12.6%
Short-Term Investments and Other Net Assets 6.5%
100.0%
​†
Based on net assets
C000222789 [Member]  
Shareholder Report [Line Items]  
Fund Name Alger 35 ETF
Class Name Alger 35 ETF
Trading Symbol ATFV
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Alger 35 ETF (“Fund”) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.alger.com/fundliterature. You can also request a copy of the semi-annual report by contacting us at (800) 223-3810.
Additional Information Phone Number (800) 223-3810
Additional Information Website www.alger.com/fundliterature
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Alger 35 ETF $31 0.57%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.57% [3]
Net Assets $ 33,556,012
Holdings Count | Holding 33 [4]
Investment Company Portfolio Turnover 103.74%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics as of the fiscal six-month period ended June 30, 2025.
Fund net assets $33,556,012
Total number of portfolio holdings1 33
Portfolio turnover rate 103.74%
1
Excludes Money Market Funds.
Holdings [Text Block]
Sector Allocation †
Equities
Communication Services 24.4%
Consumer Discretionary 12.1%
Health Care 7.3%
Industrials 8.1%
Information Technology 41.4%
Utilities 8.2%
Short-Term Investments and Other Net Assets (1.5)%
100.0%
​†
Based on net assets
C000240821 [Member]  
Shareholder Report [Line Items]  
Fund Name Alger Weatherbie Enduring Growth ETF
Class Name Alger Weatherbie Enduring Growth ETF
Trading Symbol AWEG
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Alger Weatherbie Enduring Growth ETF (“Fund”) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.alger.com/fundliterature. You can also request a copy of the semi-annual report by contacting us at (800) 223-3810.
Additional Information Phone Number (800) 223-3810
Additional Information Website www.alger.com/fundliterature
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Alger Weatherbie Enduring Growth ETF $31 0.65%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.65% [5]
Net Assets $ 5,049,643
Holdings Count | Holding 24 [6]
Investment Company Portfolio Turnover 32.02%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics as of the fiscal six-month period ended June 30, 2025.
Fund net assets $5,049,643
Total number of portfolio holdings1 24
Portfolio turnover rate 32.02%
1
Excludes Money Market Funds.
Holdings [Text Block]
Sector Allocation †
Equities
Communication Services 2.6%
Consumer Discretionary 2.4%
Financials 11.0%
Health Care 15.5%
Industrials 43.0%
Information Technology 12.5%
Real Estate 10.7%
Short-Term Investments and Other Net Assets 2.3%
100.0%
​†
Based on net assets
C000248577 [Member]  
Shareholder Report [Line Items]  
Fund Name Alger Concentrated Equity ETF
Class Name Alger Concentrated Equity ETF
Trading Symbol CNEQ
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Alger Concentrated Equity ETF (“Fund”) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.alger.com/fundliterature. You can also request a copy of the semi-annual report by contacting us at (800) 223-3810.
Additional Information Phone Number (800) 223-3810
Additional Information Website www.alger.com/fundliterature
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Alger Concentrated Equity ETF $29 0.55%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.55% [7]
Net Assets $ 55,039,163
Holdings Count | Holding 29 [8]
Investment Company Portfolio Turnover 31.27%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics as of the fiscal six-month period ended June 30, 2025.
Fund net assets $55,039,163
Total number of portfolio holdings1 29
Portfolio turnover rate 31.27%
1
Excludes Money Market Funds.
Holdings [Text Block]
Sector Allocation †
Equities
Communication Services 17.9%
Consumer Discretionary 15.1%
Financials 4.3%
Health Care 3.3%
Industrials 8.6%
Information Technology 45.0%
Utilities 5.8%
Short-Term Investments and Other Net Assets 0.0%
100.0%
​†
Based on net assets
C000248578 [Member]  
Shareholder Report [Line Items]  
Fund Name Alger AI Enablers & Adopters ETF
Class Name Alger AI Enablers & Adopters ETF
Trading Symbol ALAI
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Alger AI Enablers & Adopters ETF (“Fund”) for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.alger.com/fundliterature. You can also request a copy of the semi-annual report by contacting us at (800) 223-3810.
Additional Information Phone Number (800) 223-3810
Additional Information Website www.alger.com/fundliterature
Expenses [Text Block]
What were the Fund costs for the last six months?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Alger AI Enablers & Adopters ETF $31 0.58%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.58% [9]
Net Assets $ 71,496,530
Holdings Count | Holding 49 [10]
Investment Company Portfolio Turnover 90.07%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics as of the fiscal six-month period ended June 30, 2025.
Fund net assets $71,496,530
Total number of portfolio holdings1 49
Portfolio turnover rate 90.07%
1
Excludes Money Market Funds.
Holdings [Text Block]
Sector Allocation †
Equities
Communication Services 18.0%
Consumer Discretionary 16.7%
Consumer Staples 0.2%
Financials 3.0%
Health Care 1.6%
Industrials 4.8%
Information Technology 46.7%
Utilities 9.4%
Short-Term Investments and Other Net Assets (0.4)%
100.0%
​†
Based on net assets
C000255343 [Member]  
Shareholder Report [Line Items]  
Fund Name Alger Russell Innovation ETF
Class Name Alger Russell Innovation ETF
Trading Symbol INVN
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Alger Russell Innovation ETF (“Fund”) for the period of January 6, 2025 (commencement of operations) to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at www.alger.com/fundliterature. You can also request a copy of the semi-annual report by contacting us at (800) 223-3810.
Additional Information Phone Number (800) 223-3810
Additional Information Website www.alger.com/fundliterature
Expenses [Text Block]
What were the Fund costs since inception?
(Based on a hypothetical $10,000 investment)
Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Alger Russell Innovation ETF $26(a) 0.55%(b)
​(a)
The Fund commenced operations on January 6, 2025. Had the Fund been in operation for the entire six-month period ended June 30, 2025, the cost of a $10,000 investment would have been higher. 
​(b)
Annualized.
Expenses Paid, Amount $ 26 [11]
Expense Ratio, Percent 0.55% [12]
Net Assets $ 12,396,135
Holdings Count | Holding 50 [13]
Investment Company Portfolio Turnover 38.49%
Additional Fund Statistics [Text Block]
Key Fund Statistics
The following table outlines key fund statistics as of the fiscal six-month period ended June 30, 2025.
Fund net assets $12,396,135
Total number of portfolio holdings1 50
Portfolio turnover rate 38.49%
1
Excludes Money Market Funds.
Holdings [Text Block]
Sector Allocation †
Equities
Communication Services 10.1%
Consumer Discretionary 7.5%
Consumer Staples 2.0%
Financials 2.0%
Health Care 27.9%
Industrials 2.0%
Information Technology 46.5%
Real Estate 2.0%
Short-Term Investments and Other Net Assets 0.0%
100.0%
​†
Based on net assets
[1] Annualized.
[2] Excludes Money Market Funds.
[3] Annualized.
[4] Excludes Money Market Funds.
[5] Annualized.
[6] Excludes Money Market Funds.
[7] Annualized.
[8] Excludes Money Market Funds.
[9] Annualized.
[10] Excludes Money Market Funds.
[11] The Fund commenced operations on January 6, 2025. Had the Fund been in operation for the entire six-month period ended June 30, 2025, the cost of a $10,000 investment would have been higher. 
[12] Annualized.
[13] Excludes Money Market Funds.