Shareholder Report, Average Annual Return (Details) 190901_Boston Partners Small Cap Value II Fund_Investor Class_TSR Annual {Investor Class} |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Aug. 31, 2026 |
Aug. 31, 2026 |
Aug. 31, 2026 |
|
| Investor Class | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Investor Class | ||
| Average Annual Return, Percent | 16.03% | 8.19% | 9.23% |
| Russell 3000 Total Return Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 3000 Total Return Index | ||
| Average Annual Return, Percent | 20.10% | 11.80% | 14.84% |
| Russell 2000 Value Total Return Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 2000 Value Total Return Index | ||
| Average Annual Return, Percent | 29.95% | 8.52% | 10.08% |