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Shareholder Report
 6 Months Ended
Apr. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name NEUBERGER BERMAN ALTERNATIVE FUNDS
Entity Central Index Key 0001317474
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2025
C000108850  
Shareholder Report [Line Items]  
Fund Name Long Short Fund
Class Name Class A
Trading Symbol NLSAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Fund for the period of November 1, 2024 to April 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 nb.com/longshort. You can also request this information by contacting your financial intermediary or investment provider or at 800.877.9700 or fundinfo@nb.com.
Additional Information Phone Number 800.877.9700
Additional Information Email fundinfo@nb.com
Additional Information Website nb.com/longshort
Expenses [Text Block]

What were the Fund's costs for the past six months?

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference*
Class A
$72
1.44%
FootnoteDescription
Footnote*
Annualized.
Expenses Paid, Amount $ 72
Expense Ratio, Percent 1.44%
AssetsNet $ 7,241,193,340
Holdings Count | Holding 192
InvestmentCompanyPortfolioTurnover 36.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets
$7,241,193,340
Number of Portfolio Holdings
192
Portfolio Turnover Rate
36%
Holdings [Text Block]

Top Ten Short Securities

(as a % of Total InvestmentsFootnote Reference*)

Progressive Corp.
(0.6)%
Goldman Sachs Group, Inc.
(0.5)%
Interpublic Group of Cos., Inc.
(0.5)%
Nordstrom, Inc.
(0.5)%
Lamar Advertising Co. Class A
(0.5)%
J.M. Smucker Co.
(0.5)%
Exelon Corp.
(0.4)%
Amer Sports, Inc.
(0.4)%
Moelis & Co. Class A
(0.4)%
Consolidated Edison, Inc.
(0.4)%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.

Portfolio by Investment Type

(as a % of Total Net Assets)

Name
Long
Short
Common Stocks
82.0%
(13.3)%
Master Limited Partnerships and Limited Partnerships
2.7%
-%
Preferred Stocks
1.2%
-%
Convertible Bonds
0.4%
-%
Loan Assignments
0.3%
-%
Purchased Option Contracts
0.0%Footnote Reference*
-%
Corporate Bonds
0.0%Footnote Reference*
-%
Short-Term Investments
10.2%
-%
Other Assets Less Liabilities
16.5%Footnote Reference**
-%
Total
113.3%
(13.3)%
FootnoteDescription
Footnote*
Represents less than 0.05% of net assets of the Fund.
Footnote**
Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any.
Largest Holdings [Text Block]

Top Ten Long Securities

(as a % of Total InvestmentsFootnote Reference*)

State Street Institutional U.S. Government Money Market Fund Premier Class
12.2%
Microsoft Corp.
5.3%
Apple, Inc.
5.3%
Amazon.com, Inc.
4.7%
Alphabet, Inc. Class A
3.3%
Meta Platforms, Inc. Class A
3.2%
NVIDIA Corp.
3.1%
Fanatics Holdings, Inc. Class A
2.5%
Home Depot, Inc.
2.3%
TJX Cos., Inc.
2.2%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
C000108851  
Shareholder Report [Line Items]  
Fund Name Long Short Fund
Class Name Class C
Trading Symbol NLSCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Fund for the period of November 1, 2024 to April 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 nb.com/longshort. You can also request this information by contacting your financial intermediary or investment provider or at 800.877.9700 or fundinfo@nb.com.
Additional Information Phone Number 800.877.9700
Additional Information Email fundinfo@nb.com
Additional Information Website nb.com/longshort
Expenses [Text Block]

What were the Fund's costs for the past six months?

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference*
Class C
$110
2.19%
FootnoteDescription
Footnote*
Annualized.
Expenses Paid, Amount $ 110
Expense Ratio, Percent 2.19%
AssetsNet $ 7,241,193,340
Holdings Count | Holding 192
InvestmentCompanyPortfolioTurnover 36.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets
$7,241,193,340
Number of Portfolio Holdings
192
Portfolio Turnover Rate
36%
Holdings [Text Block]

Top Ten Short Securities

(as a % of Total InvestmentsFootnote Reference*)

Progressive Corp.
(0.6)%
Goldman Sachs Group, Inc.
(0.5)%
Interpublic Group of Cos., Inc.
(0.5)%
Nordstrom, Inc.
(0.5)%
Lamar Advertising Co. Class A
(0.5)%
J.M. Smucker Co.
(0.5)%
Exelon Corp.
(0.4)%
Amer Sports, Inc.
(0.4)%
Moelis & Co. Class A
(0.4)%
Consolidated Edison, Inc.
(0.4)%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.

Portfolio by Investment Type

(as a % of Total Net Assets)

Name
Long
Short
Common Stocks
82.0%
(13.3)%
Master Limited Partnerships and Limited Partnerships
2.7%
-%
Preferred Stocks
1.2%
-%
Convertible Bonds
0.4%
-%
Loan Assignments
0.3%
-%
Purchased Option Contracts
0.0%Footnote Reference*
-%
Corporate Bonds
0.0%Footnote Reference*
-%
Short-Term Investments
10.2%
-%
Other Assets Less Liabilities
16.5%Footnote Reference**
-%
Total
113.3%
(13.3)%
FootnoteDescription
Footnote*
Represents less than 0.05% of net assets of the Fund.
Footnote**
Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any.
Largest Holdings [Text Block]

Top Ten Long Securities

(as a % of Total InvestmentsFootnote Reference*)

State Street Institutional U.S. Government Money Market Fund Premier Class
12.2%
Microsoft Corp.
5.3%
Apple, Inc.
5.3%
Amazon.com, Inc.
4.7%
Alphabet, Inc. Class A
3.3%
Meta Platforms, Inc. Class A
3.2%
NVIDIA Corp.
3.1%
Fanatics Holdings, Inc. Class A
2.5%
Home Depot, Inc.
2.3%
TJX Cos., Inc.
2.2%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.
C000108852  
Shareholder Report [Line Items]  
Fund Name Long Short Fund
Class Name Institutional Class
Trading Symbol NLSIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Fund for the period of November 1, 2024 to April 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 nb.com/longshort. You can also request this information by contacting your financial intermediary or investment provider or at 800.366.6264 or issdl@nb.com.
Additional Information Phone Number 800.366.6264
Additional Information Email issdl@nb.com
Additional Information Website nb.com/longshort
Expenses [Text Block]

What were the Fund's costs for the past six months?

(based on a hypothetical $10,000 investment)

Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investmentFootnote Reference*
Institutional Class
$54
1.08%
FootnoteDescription
Footnote*
Annualized.
Expenses Paid, Amount $ 54
Expense Ratio, Percent 1.08%
AssetsNet $ 7,241,193,340
Holdings Count | Holding 192
InvestmentCompanyPortfolioTurnover 36.00%
Additional Fund Statistics [Text Block]

Key Fund Statistics

Net Assets
$7,241,193,340
Number of Portfolio Holdings
192
Portfolio Turnover Rate
36%
Holdings [Text Block]

Top Ten Short Securities

(as a % of Total InvestmentsFootnote Reference*)

Progressive Corp.
(0.6)%
Goldman Sachs Group, Inc.
(0.5)%
Interpublic Group of Cos., Inc.
(0.5)%
Nordstrom, Inc.
(0.5)%
Lamar Advertising Co. Class A
(0.5)%
J.M. Smucker Co.
(0.5)%
Exelon Corp.
(0.4)%
Amer Sports, Inc.
(0.4)%
Moelis & Co. Class A
(0.4)%
Consolidated Edison, Inc.
(0.4)%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.

Portfolio by Investment Type

(as a % of Total Net Assets)

Name
Long
Short
Common Stocks
82.0%
(13.3)%
Master Limited Partnerships and Limited Partnerships
2.7%
-%
Preferred Stocks
1.2%
-%
Convertible Bonds
0.4%
-%
Loan Assignments
0.3%
-%
Purchased Option Contracts
0.0%Footnote Reference*
-%
Corporate Bonds
0.0%Footnote Reference*
-%
Short-Term Investments
10.2%
-%
Other Assets Less Liabilities
16.5%Footnote Reference**
-%
Total
113.3%
(13.3)%
FootnoteDescription
Footnote*
Represents less than 0.05% of net assets of the Fund.
Footnote**
Includes the impact of the Fund's open positions in derivatives (other than options purchased), if any.
Largest Holdings [Text Block]

Top Ten Long Securities

(as a % of Total InvestmentsFootnote Reference*)

State Street Institutional U.S. Government Money Market Fund Premier Class
12.2%
Microsoft Corp.
5.3%
Apple, Inc.
5.3%
Amazon.com, Inc.
4.7%
Alphabet, Inc. Class A
3.3%
Meta Platforms, Inc. Class A
3.2%
NVIDIA Corp.
3.1%
Fanatics Holdings, Inc. Class A
2.5%
Home Depot, Inc.
2.3%
TJX Cos., Inc.
2.2%
FootnoteDescription
Footnote*
Derivatives (other than options purchased), if any, are excluded from this calculation.