S000031373 [Member] Investment Strategy - Columbia Select Large Cap Value Fund	May 31, 2025
Prospectus [Line Items]
Strategy [Heading]	Principal Investment Strategies
Strategy Narrative [Text Block]	Under normal circumstances, at least 80% of the Fund’s net assets (including the amount of any borrowings for investment purposes) are invested in equity securities of large capitalization issuers. These companies have market capitalizations in the range of companies in the Russell 1000® Value Index (the Index) at the time of purchase (between $136.3 million and $2.4 trillion as of August 31, 2025). The market capitalization range and composition of companies in the Index are subject to change. The Fund’s Board of Trustees may change the parameters by which large market capitalization is defined if it concludes such a change is appropriate. The Fund invests substantially in securities of U.S. issuers. The Fund also invests substantially in “value” companies. The Fund considers “value” companies to be those companies believed by the investment manager to be undervalued, either historically, by the market, or as compared with issuers in the same or similar industry or sector. The Fund may at times emphasize one or more sectors in selecting its investments, including the financials sector. The Fund may hold a small number of securities, consistent with its value investment approach. Generally, the Fund anticipates holding between 30 and 40 securities in its portfolio; however, the Fund may hold, at any time, more or fewer securities than noted in this range.

Under normal circumstances, at least 80% of the Fund’s net assets (including the amount of any borrowings for investment purposes) are invested in equity securities of large capitalization issuers. These companies have market capitalizations in the range of companies in the Russell 1000® Value Index (the Index) at the time of purchase (between $136.3 million and $2.4 trillion as of August 31, 2025). The market capitalization range and composition of companies in the Index are subject to change. The Fund’s Board of Trustees may change the parameters by which large market capitalization is defined if it concludes such a change is appropriate.

The Fund invests substantially in securities of U.S. issuers. The Fund also invests substantially in “value” companies. The Fund considers “value” companies to be those companies believed by the investment manager to be undervalued, either historically, by the market, or as compared with issuers in the same or similar industry or sector. The Fund may at times emphasize one or more sectors in selecting its investments, including the financials sector. The Fund may hold a small number of securities, consistent with its value investment approach. Generally, the Fund anticipates holding between 30 and 40 securities in its portfolio; however, the Fund may hold, at any time, more or fewer securities than noted in this range.