Shareholder Report, Average Annual Return (Details) |
12 Months Ended | 60 Months Ended | 120 Months Ended | ||||
---|---|---|---|---|---|---|---|
Apr. 30, 2025 |
Apr. 30, 2025 |
Apr. 30, 2025 |
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Columbia U.S. Treasury Index Fund - Class A | |||||||
Average Annual Return [Line Items] | |||||||
Line Graph and Table Measure Name | Class A | ||||||
Average Annual Return, Percent | 7.26% | (1.97%) | 0.74% | ||||
Columbia U.S. Treasury Index Fund - Institutional Class | |||||||
Average Annual Return [Line Items] | |||||||
Line Graph and Table Measure Name | Institutional Class | ||||||
Average Annual Return, Percent | 7.53% | (1.80%) | 0.90% | ||||
Columbia U.S. Treasury Index Fund - Institutional 2 Class | |||||||
Average Annual Return [Line Items] | |||||||
Line Graph and Table Measure Name | Institutional 2 Class | ||||||
Average Annual Return, Percent | 7.54% | (1.79%) | 0.90% | ||||
Columbia U.S. Treasury Index Fund - Institutional 3 Class | |||||||
Average Annual Return [Line Items] | |||||||
Line Graph and Table Measure Name | Institutional 3 Class | ||||||
Average Annual Return, Percent | [1] | 7.40% | (1.81%) | 0.88% | |||
Bloomberg U.S. Aggregate Bond Index [Member] | |||||||
Average Annual Return [Line Items] | |||||||
Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index | ||||||
Average Annual Return, Percent | [2] | 8.02% | (0.67%) | 1.54% | |||
FTSE USBIG Treasury Index [Member] | |||||||
Average Annual Return [Line Items] | |||||||
Line Graph and Table Measure Name | FTSE USBIG Treasury Index | ||||||
Average Annual Return, Percent | 7.67% | (1.65%) | 1.07% | ||||
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