Shareholder Report, Average Annual Return (Details) 190904_Boston Partners Long-Short Research 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 | 13.12% | 10.69% | 6.93% |
| S&P 500 Total Return Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | S&P 500 Total Return Index | ||
| Average Annual Return, Percent | 20.38% | 12.79% | 15.37% |