Shareholder Report, Line Graph (Details) 190904_Boston Partners Long-Short Research Fund_Institutional Class_TSR Annual {Institutional Class} - USD ($) |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Aug. 31, 2025 |
Aug. 31, 2024 |
Aug. 31, 2023 |
Aug. 31, 2022 |
Aug. 31, 2021 |
Aug. 31, 2020 |
Aug. 31, 2019 |
Aug. 31, 2018 |
Aug. 31, 2017 |
Aug. 31, 2016 |
Aug. 31, 2026 |
|
| Institutional Class | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Institutional Class | ||||||||||
| Accumulated Value | $ 176,689 | $ 162,434 | $ 136,735 | $ 127,605 | $ 119,068 | $ 94,221 | $ 104,838 | $ 109,258 | $ 106,829 | $ 100,000 | $ 200,485 |
| S&P 500 Total Return Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | S&P 500 Total Return Index | ||||||||||
| Accumulated Value | $ 347,177 | $ 299,601 | $ 235,655 | $ 203,248 | $ 228,955 | $ 174,554 | $ 143,151 | $ 139,088 | $ 116,234 | $ 100,000 | $ 417,931 |