Shareholder Report, Line Graph (Details) 190903_Boston Partners Long-Short Equity Fund_Investor Class_TSR Annual {Investor 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 |
|
| Investor Class | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Investor Class | ||||||||||
| Accumulated Value | $ 20,715 | $ 17,699 | $ 14,359 | $ 12,547 | $ 11,610 | $ 9,020 | $ 9,595 | $ 10,237 | $ 10,409 | $ 10,000 | $ 27,946 |
| 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 | $ 34,718 | $ 29,960 | $ 23,566 | $ 20,325 | $ 22,895 | $ 17,455 | $ 14,315 | $ 13,909 | $ 11,623 | $ 10,000 | $ 41,793 |