v3.25.4
Fees and Expenses
Oct. 31, 2025
Old Westbury All Cap Core Fund | Old Westbury All Cap Core Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or example below.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Management Fees 0.67 %
Other Expenses 0.28 %
Total Annual Fund Operating Expenses 0.95 %
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated below and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
1 Year 3 Years 5 Years 10 Years
$97 $303 $525 $1,166
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the fiscal year ended October 31, 2025, the Fund’s portfolio turnover rate was 38% of the average value of its portfolio.
Portfolio Turnover, Rate 38.00%
Old Westbury Large Cap Strategies Fund | Old Westbury Large Cap Strategies Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or example below.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Management Fees 0.81 %
Other Expenses 0.29 %
Total Annual Fund Operating Expenses 1.10 %
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated below and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
1 Year 3 Years 5 Years 10 Years
$112 $350 $606 $1,340
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the fiscal year ended October 31, 2025, the Fund’s portfolio turnover rate was 48% of the average value of its portfolio.
Portfolio Turnover, Rate 48.00%
Old Westbury Small & Mid Cap Strategies Fund | Old Westbury Small & Mid Cap Strategies Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or example below.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total Annual Fund Operating Expenses will not agree with the ratio of expenses to average net assets before expense waiver in the Fund’s Financial Highlights, as the Financial Highlights reflect actual direct operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Management Fees 0.85 %
Other Expenses 0.29 %
Acquired Fund Fees and Expenses 0.02 %
Total Annual Fund Operating Expenses(1) 1.16 %
Less Fee Waiver(2) (0.04 )%
Total Annual Fund Operating Expenses After Fee Waiver(2) 1.12 %
(1)Total Annual Fund Operating Expenses will not agree with the ratio of expenses to average net assets before expense waiver in the Fund’s Financial Highlights, as the Financial Highlights reflect actual direct operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

 

(2)The Adviser has contractually committed through October 31, 2028 to waive its advisory fees to the extent necessary to maintain the net operating expense ratio of the Fund, excluding Fund transaction costs, investment interest expense, dividend expenses associated with securities sold short and Acquired Fund Fees and Expenses (if any), at 1.10%. This commitment may not be changed or terminated at any time before October 31, 2028 without the approval of the Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated below and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same (taking into account the contractual fee waiver for the current duration of the arrangement only). Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
1 Year 3 Years 5 Years 10 Years
$114 $365 $634 $1,405
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the fiscal year ended October 31, 2025, the Fund’s portfolio turnover rate was 61% of the average value of its portfolio.
Portfolio Turnover, Rate 61.00%
Old Westbury Total Equity Fund | Old Westbury Total Equity Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or example below.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total Annual Fund Operating Expenses will not agree with the ratio of expenses to average net assets before expense waiver in the Fund’s Financial Highlights, as the Financial Highlights reflect actual direct operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Management Fees 0.78 %
Other Expenses 0.32 %
Acquired Fund Fees and Expenses 0.01 %
Total Annual Fund Operating Expenses(1) 1.11 %
Less Fee Waiver(2) (0.12 )%
Total Annual Fund Operating Expenses After Fee Waiver(2) 0.99 %
(1)Total Annual Fund Operating Expenses will not agree with the ratio of expenses to average net assets before expense waiver in the Fund’s Financial Highlights, as the Financial Highlights reflect actual direct operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

 

(2)The Adviser has contractually committed through October 31, 2028 to waive its advisory fees to the extent necessary to maintain the net operating expense ratio of the Fund, excluding Fund transaction costs, investment interest expense, dividend expenses associated with securities sold short and Acquired Fund Fees and Expenses (if any), at 0.98%. This commitment may not be changed or terminated at any time before October 31, 2028 without the approval of the Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated below and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same (taking into account the contractual fee waiver for the current duration of the arrangement only). Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
1 Year 3 Years 5 Years 10 Years
$101 $341 $600 $1,341
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the period from February 28, 2025 (commencement of operations) through October 31, 2025, the Fund’s portfolio turnover rate was 25% of the average value of its portfolio.
Portfolio Turnover, Rate 25.00%
Old Westbury Credit Income Fund | Old Westbury Credit Income Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or example below.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total Annual Fund Operating Expenses will not agree with the ratio of expenses to average net assets in the Fund’s Financial Highlights, as the Financial Highlights reflect actual direct operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Management Fees   0.58 %
Other Expenses   0.28 %
Acquired Fund Fees and Expenses   0.06 %
Total Annual Fund Operating Expenses(1)   0.92 %
Less Fee Waiver(2) (0.01 )%
Total Annual Fund Operating Expenses After Fee Waiver(2) 0.91 %
(1)Total Annual Fund Operating Expenses will not agree with the ratio of expenses to average net assets in the Fund’s Financial Highlights, as the Financial Highlights reflect actual direct operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

 

(2)The Adviser has contractually committed through October 31, 2028 to waive its advisory fees to the extent necessary to maintain the net operating expense ratio of the Fund, excluding Fund transaction costs, investment interest expense, dividend expenses associated with securities sold short and Acquired Fund Fees and Expenses (if any), at 0.85%. This commitment may not be changed or terminated at any time before October 31, 2028 without the approval of the Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated below and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same (taking into account the contractual fee waiver for the current duration of the arrangement only). Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
1 Year   3 Years   5 Years   10 Years
$93   $292   $508   $1,130
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the fiscal year ended October 31, 2025, the Fund’s portfolio turnover rate was 14% of the average value of its portfolio.
Portfolio Turnover, Rate 14.00%
Old Westbury Fixed Income Fund | Old Westbury Fixed Income Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or example below.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Management Fees   0.40 %
Other Expenses   0.29 %
Total Annual Fund Operating Expenses   0.69 %
Less Fee Waiver(1)   (0.12 )%
Total Annual Fund Operating Expenses After Fee Waiver(1)   0.57 %

 

 

 

(1)The Adviser has contractually committed through October 31, 2028 to waive its advisory fees to the extent necessary to maintain the net operating expense ratio of the Fund, excluding Fund transaction costs, investment interest expense, dividend expenses associated with securities sold short and Acquired Fund Fees and Expenses (if any), at 0.57%. This commitment may not be changed or terminated at any time before October 31, 2028 without the approval of the Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated below and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same (taking into account the contractual fee waiver for the current duration of the arrangement only). Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
1 Year 3 Years 5 Years 10 Years
$58 $196 $360 $835
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the fiscal year ended October 31, 2025, the Fund’s portfolio turnover rate was 84% of the average value of its portfolio.
Portfolio Turnover, Rate 84.00%
Old Westbury Short-Term Bond Fund | Old Westbury Short-Term Bond Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or example below.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Management Fees   0.32 %
Other Expenses   0.42 %
Total Annual Fund Operating Expenses   0.74 %
Less Fee Waiver(1)   (0.37 )%
Total Annual Fund Operating Expenses After Fee Waiver(1)   0.37 %
(1)The Adviser has contractually committed through October 31, 2028 to waive its advisory fees to the extent necessary to maintain the net operating expense ratio of the Fund, excluding Fund transaction costs, investment interest expense, dividend expenses associated with securities sold short and Acquired Fund Fees and Expenses (if any), at 0.37%. This commitment may not be changed or terminated at any time before October 31, 2028 without the approval of the Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated below and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same (taking into account the contractual fee waiver for the current duration of the arrangement only). Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
  1 Year   3 Years   5 Years   10 Years  
  $38   $163   $339   $849  
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the fiscal year ended October 31, 2025, the Fund’s portfolio turnover rate was 28% of the average value of its portfolio.
Portfolio Turnover, Rate 28.00%
Old Westbury Municipal Bond Fund | Old Westbury Municipal Bond Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or example below.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Management Fees   0.37 %
Other Expenses   0.28 %
Total Annual Fund Operating Expenses   0.65 %
Less Fee Waiver(1)   (0.08 )%
Total Annual Fund Operating Expenses After Fee Waiver(1)   0.57 %

 

 

 

(1)The Adviser has contractually committed through October 31, 2028 to waive its advisory fees to the extent necessary to maintain the net operating expense ratio of the Fund, excluding Fund transaction costs, investment interest expense, dividend expenses associated with securities sold short and Acquired Fund Fees and Expenses (if any), at 0.57%. This commitment may not be changed or terminated at any time before October 31, 2028 without the approval of the Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated below and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same (taking into account the contractual fee waiver for the current duration of the arrangement only). Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
  1 Year   3 Years   5 Years   10 Years  
  $58   $191   $346   $796  
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the fiscal year ended October 31, 2025, the Fund’s portfolio turnover rate was 52% of the average value of its portfolio.
Portfolio Turnover, Rate 52.00%
Old Westbury California Municipal Bond Fund | Old Westbury California Municipal Bond Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or example below.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Management Fees   0.45 %
Other Expenses   0.31 %
Total Annual Fund Operating Expenses   0.76 %
Less Fee Waiver(1)   (0.19 )%
Total Annual Fund Operating Expenses After Fee Waiver(1)   0.57 %

 

 

 

(1)The Adviser has contractually committed through October 31, 2028 to waive its advisory fees to the extent necessary to maintain the net operating expense ratio of the Fund, excluding Fund transaction costs, investment interest expense, dividend expenses associated with securities sold short and Acquired Fund Fees and Expenses (if any), at 0.57%. This commitment may not be changed or terminated at any time before October 31, 2028 without the approval of the Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated below and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same (taking into account the contractual fee waiver for the current duration of the arrangement only). Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
  1 Year   3 Years   5 Years   10 Years  
  $58   $183   $363   $886  
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the fiscal year ended October 31, 2025, the Fund’s portfolio turnover rate was 24% of the average value of its portfolio.
Portfolio Turnover, Rate 24.00%
Old Westbury New York Municipal Bond Fund | Old Westbury New York Municipal Bond Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table or example below.
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]
Management Fees   0.44 %
Other Expenses   0.30 %
Total Annual Fund Operating Expenses   0.74 %
Less Fee Waiver(1)   (0.17 )%
Total Annual Fund Operating Expenses After Fee Waiver(1)   0.57 %

 

 

 

(1)The Adviser has contractually committed through October 31, 2028 to waive its advisory fees to the extent necessary to maintain the net operating expense ratio of the Fund, excluding Fund transaction costs, investment interest expense, dividend expenses associated with securities sold short and Acquired Fund Fees and Expenses (if any), at 0.57%. This commitment may not be changed or terminated at any time before October 31, 2028 without the approval of the Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated below and then redeem all of your shares at the end of these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same (taking into account the contractual fee waiver for the current duration of the arrangement only). Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
1 Year   3 Years   5 Years   10 Years
$58   $201   $377   $885
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transactions costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the fiscal year ended October 31, 2025, the Fund’s portfolio turnover rate was 19% of the average value of its portfolio.
Portfolio Turnover, Rate 19.00%