v3.25.4
Expense Example
Oct. 31, 2025
USD ($)
Old Westbury All Cap Core Fund | Old Westbury All Cap Core Fund | Old Westbury All Cap Core Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 97
Expense Example, with Redemption, 3 Years 303
Expense Example, with Redemption, 5 Years 525
Expense Example, with Redemption, 10 Years 1,166
Old Westbury Large Cap Strategies Fund | Old Westbury Large Cap Strategies Fund | Old Westbury Large Cap Strategies Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 112
Expense Example, with Redemption, 3 Years 350
Expense Example, with Redemption, 5 Years 606
Expense Example, with Redemption, 10 Years 1,340
Old Westbury Small & Mid Cap Strategies Fund | Old Westbury Small & Mid Cap Strategies Fund | Old Westbury Small & Mid Cap Strategies Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 114
Expense Example, with Redemption, 3 Years 365
Expense Example, with Redemption, 5 Years 634
Expense Example, with Redemption, 10 Years 1,405
Old Westbury Total Equity Fund | Old Westbury Total Equity Fund | Old Westbury Total Equity Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 101
Expense Example, with Redemption, 3 Years 341
Expense Example, with Redemption, 5 Years 600
Expense Example, with Redemption, 10 Years 1,341
Old Westbury Credit Income Fund | Old Westbury Credit Income Fund | Old Westbury Credit Income Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 93
Expense Example, with Redemption, 3 Years 292
Expense Example, with Redemption, 5 Years 508
Expense Example, with Redemption, 10 Years 1,130
Old Westbury Fixed Income Fund | Old Westbury Fixed Income Fund | Old Westbury Fixed Income Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 58
Expense Example, with Redemption, 3 Years 196
Expense Example, with Redemption, 5 Years 360
Expense Example, with Redemption, 10 Years 835
Old Westbury Short-Term Bond Fund | Old Westbury Short-Term Bond Fund | Old Westbury Short-Term Bond Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 38
Expense Example, with Redemption, 3 Years 163
Expense Example, with Redemption, 5 Years 339
Expense Example, with Redemption, 10 Years 849
Old Westbury Municipal Bond Fund | Old Westbury Municipal Bond Fund | Old Westbury Municipal Bond Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 58
Expense Example, with Redemption, 3 Years 191
Expense Example, with Redemption, 5 Years 346
Expense Example, with Redemption, 10 Years 796
Old Westbury California Municipal Bond Fund | Old Westbury California Municipal Bond Fund | Old Westbury California Municipal Bond Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 58
Expense Example, with Redemption, 3 Years 183
Expense Example, with Redemption, 5 Years 363
Expense Example, with Redemption, 10 Years 886
Old Westbury New York Municipal Bond Fund | Old Westbury New York Municipal Bond Fund | Old Westbury New York Municipal Bond Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 58
Expense Example, with Redemption, 3 Years 201
Expense Example, with Redemption, 5 Years 377
Expense Example, with Redemption, 10 Years $ 885