Shareholder Report, Line Graph (Details) 190903_Boston Partners Long-Short Equity 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 | $ 211,666 | $ 180,443 | $ 146,090 | $ 127,375 | $ 117,556 | $ 91,071 | $ 96,660 | $ 102,890 | $ 104,331 | $ 100,000 | $ 286,554 |
| 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 |