Columbia Acorn<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">® Fund Class A (including sales charges) ($20,858)

Average Annual Return, Percent

(1.43%)

(0.36%)

7.63%

C000024956

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

2.82%

0.08%

7.46%

C000251059

Average Annual Return [Line Items]

Line Graph and Table Measure Name

C000122736

Average Annual Return [Line Items]

Line Graph and Table Measure Name

C000122737

Average Annual Return [Line Items]

Line Graph and Table Measure Name

C000024957

Average Annual Return [Line Items]

Line Graph and Table Measure Name

C000024958

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Acorn International<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">® Class A (including sales charges) ($14,297)

Average Annual Return, Percent

5.69%

(2.26%)

3.64%

C000251060

Average Annual Return [Line Items]

Line Graph and Table Measure Name

C000097733

Average Annual Return [Line Items]

Line Graph and Table Measure Name

C000122739

Average Annual Return [Line Items]

Line Graph and Table Measure Name

C000024961

Average Annual Return [Line Items]

Line Graph and Table Measure Name

C000024970

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Acorn International Select℠ Class A (including sales charges) ($17,573)

Average Annual Return, Percent

13.38%

(1.38%)

5.80%

C000251061

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Acorn International Select℠ Class S ($19,125)

C000122746

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Acorn International Select℠ Institutional 2 Class ($19,312)

C000122747

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Acorn International Select℠ Institutional 3 Class ($19,401)

C000024973

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Acorn International Select℠ Institutional Class ($19,125)

C000024974

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Thermostat Fund℠ Class A (including sales charges) ($19,509)

Average Annual Return, Percent

8.18%

3.64%

6.91%

C000024976

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Thermostat Fund℠ Class C (including sales charges) ($19,197)

Average Annual Return, Percent

12.86%

4.10%

6.74%

C000251062

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Thermostat Fund℠ Class S ($21,218)

C000122750

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Thermostat Fund℠ Institutional 2 Class ($21,308)

C000122751

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Thermostat Fund℠ Institutional 3 Class ($21,399)

C000024977

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Columbia Thermostat Fund℠ Institutional Class ($21,218)

Without Sales Load [Member] | C000103324

Average Annual Return [Line Items]

Average Annual Return, Percent

23.85%

2.10%

7.96%

Without Sales Load [Member] | C000103327

Average Annual Return [Line Items]

Average Annual Return, Percent

24.20%

2.35%

8.23%

Without Sales Load [Member] | C000024954

Average Annual Return [Line Items]

Average Annual Return, Percent

4.56%

0.83%

8.27%

Without Sales Load [Member] | C000024956

Average Annual Return [Line Items]

Average Annual Return, Percent

3.82%

0.08%

7.46%

Without Sales Load [Member] | C000251059

Average Annual Return [Line Items]

Average Annual Return, Percent

4.88%

1.09%

8.55%

Without Sales Load [Member] | C000122736

Average Annual Return [Line Items]

Average Annual Return, Percent

4.85%

1.11%

8.58%

Without Sales Load [Member] | C000122737

Average Annual Return [Line Items]

Average Annual Return, Percent

4.91%

1.15%

8.63%

Without Sales Load [Member] | C000024957

Average Annual Return [Line Items]

Average Annual Return, Percent

4.80%

1.07%

8.54%

Without Sales Load [Member] | C000024958

Average Annual Return [Line Items]

Average Annual Return, Percent

12.12%

(1.09%)

4.25%

Without Sales Load [Member] | C000251060

Average Annual Return [Line Items]

Average Annual Return, Percent

12.36%

(0.85%)

4.51%

Without Sales Load [Member] | C000097733

Average Annual Return [Line Items]

Average Annual Return, Percent

12.44%

(0.80%)

4.57%

Without Sales Load [Member] | C000122739

Average Annual Return [Line Items]

Average Annual Return, Percent

12.46%

(0.76%)

4.62%

Without Sales Load [Member] | C000024961

Average Annual Return [Line Items]

Average Annual Return, Percent

12.36%

(0.85%)

4.51%

Without Sales Load [Member] | C000024970

Average Annual Return [Line Items]

Average Annual Return, Percent

20.31%

(0.21%)

6.43%

Without Sales Load [Member] | C000251061

Average Annual Return [Line Items]

Average Annual Return, Percent

20.61%

0.04%

6.70%

Without Sales Load [Member] | C000122746

Average Annual Return [Line Items]

Average Annual Return, Percent

20.73%

0.16%

6.80%

Without Sales Load [Member] | C000122747

Average Annual Return [Line Items]

Average Annual Return, Percent

20.81%

0.20%

6.85%

Without Sales Load [Member] | C000024973

Average Annual Return [Line Items]

Average Annual Return, Percent

20.61%

0.04%

6.70%

Without Sales Load [Member] | C000024974

Average Annual Return [Line Items]

Average Annual Return, Percent

14.75%

4.88%

7.54%

Without Sales Load [Member] | C000024976

Average Annual Return [Line Items]

Average Annual Return, Percent

13.86%

4.10%

6.74%

Without Sales Load [Member] | C000251062

Average Annual Return [Line Items]

Average Annual Return, Percent

15.02%

5.14%

7.81%

Without Sales Load [Member] | C000122750

Average Annual Return [Line Items]

Average Annual Return, Percent

15.12%

5.20%

7.86%

Without Sales Load [Member] | C000122751

Average Annual Return [Line Items]

Average Annual Return, Percent

15.20%

5.24%

7.90%

Without Sales Load [Member] | C000024977

Average Annual Return [Line Items]

Average Annual Return, Percent

15.02%

5.14%

7.81%

Columbia Threadneedle: MSCI ACWI ex USA Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI ACWI ex USA Index (Net) ($22,432)

Average Annual Return, Percent

32.39%

7.91%

8.41%

Columbia Threadneedle: MSCI ACWI ex USA Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI ACWI ex USA Index (Net) ($22,432)

Average Annual Return, Percent

32.39%

7.91%

8.41%

Columbia Threadneedle: Russell 3000® Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Russell 3000<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">® Index ($38,012)

Average Annual Return, Percent

17.15%

13.15%

14.29%

Columbia Threadneedle: Russell 3000® Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

17.15%

13.15%

14.29%

Columbia Threadneedle: Russell 3000® Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

17.15%

13.15%

14.29%

Columbia Threadneedle: Russell 3000® Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

17.15%

13.15%

14.29%

Columbia Threadneedle: Russell 3000® Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

17.15%

13.15%

14.29%

Columbia Threadneedle: Russell 3000® Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

17.15%

13.15%

14.29%

Columbia Threadneedle: MSCI EAFE Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Index (Net) ($21,959)

Average Annual Return, Percent

31.22%

8.92%

8.18%

Columbia Threadneedle: MSCI EAFE Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Index (Net) ($21,959)

Average Annual Return, Percent

31.22%

8.92%

8.18%

Columbia Threadneedle: MSCI EAFE Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Index (Net) ($21,959)

Average Annual Return, Percent

31.22%

8.92%

8.18%

Columbia Threadneedle: MSCI EAFE Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Index (Net) ($21,959)

Average Annual Return, Percent

31.22%

8.92%

8.18%

Columbia Threadneedle: MSCI EAFE Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Index (Net) ($21,959)

Average Annual Return, Percent

31.22%

8.92%

8.18%

Columbia Threadneedle: MSCI EAFE Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Index (Net) ($21,959)

Average Annual Return, Percent

31.22%

8.92%

8.18%

Columbia Threadneedle: MSCI EAFE Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Index (Net) ($21,959)

Average Annual Return, Percent

31.22%

8.92%

8.18%

Columbia Threadneedle: MSCI EAFE Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Index (Net) ($21,959)

Average Annual Return, Percent

31.22%

8.92%

8.18%

Columbia Threadneedle: MSCI EAFE Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Index (Net) ($21,959)

Average Annual Return, Percent

31.22%

8.92%

8.18%

Columbia Threadneedle: MSCI EAFE Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Index (Net) ($21,959)

Average Annual Return, Percent

31.22%

8.92%

8.18%

Columbia Threadneedle: Bloomberg U.S. Aggregate Bond Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Aggregate Bond Index ($12,199)

Average Annual Return, Percent

7.30%

(0.36%)

2.01%

Columbia Threadneedle: Bloomberg U.S. Aggregate Bond Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Aggregate Bond Index ($12,199)

Average Annual Return, Percent

7.30%

(0.36%)

2.01%

Columbia Threadneedle: Bloomberg U.S. Aggregate Bond Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Aggregate Bond Index ($12,199)

Average Annual Return, Percent

7.30%

(0.36%)

2.01%

Columbia Threadneedle: Bloomberg U.S. Aggregate Bond Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Aggregate Bond Index ($12,199)

Average Annual Return, Percent

7.30%

(0.36%)

2.01%

Columbia Threadneedle: Bloomberg U.S. Aggregate Bond Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Aggregate Bond Index ($12,199)

Average Annual Return, Percent

7.30%

(0.36%)

2.01%

Columbia Threadneedle: Bloomberg U.S. Aggregate Bond Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Bloomberg U.S. Aggregate Bond Index ($12,199)

Average Annual Return, Percent

7.30%

(0.36%)

2.01%

Columbia Threadneedle: MSCI AC Europe Small Cap Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI AC Europe Small Cap Index (Net) ($20,167)

Average Annual Return, Percent

31.83%

5.15%

7.27%

Columbia Threadneedle: MSCI AC Europe Small Cap Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI AC Europe Small Cap Index (Net) ($20,167)

Average Annual Return, Percent

31.83%

5.15%

7.27%

Columbia Threadneedle: Russell 2500® Growth Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Russell 2500<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">® Growth Index ($27,272)

Average Annual Return, Percent

10.31%

2.98%

10.55%

Columbia Threadneedle: Russell 2500® Growth Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

10.31%

2.98%

10.55%

Columbia Threadneedle: Russell 2500® Growth Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

10.31%

2.98%

10.55%

Columbia Threadneedle: Russell 2500® Growth Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

10.31%

2.98%

10.55%

Columbia Threadneedle: Russell 2500® Growth Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

10.31%

2.98%

10.55%

Columbia Threadneedle: Russell 2500® Growth Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

10.31%

2.98%

10.55%

Columbia Threadneedle: MSCI EAFE SMID Cap Growth Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE SMID Cap Growth Index (Net) ($18,583)

Average Annual Return, Percent

24.96%

2.45%

6.39%

Columbia Threadneedle: MSCI EAFE SMID Cap Growth Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE SMID Cap Growth Index (Net) ($18,583)

Average Annual Return, Percent

24.96%

2.45%

6.39%

Columbia Threadneedle: MSCI EAFE SMID Cap Growth Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE SMID Cap Growth Index (Net) ($18,583)

Average Annual Return, Percent

24.96%

2.45%

6.39%

Columbia Threadneedle: MSCI EAFE SMID Cap Growth Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE SMID Cap Growth Index (Net) ($18,583)

Average Annual Return, Percent

24.96%

2.45%

6.39%

Columbia Threadneedle: MSCI EAFE SMID Cap Growth Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE SMID Cap Growth Index (Net) ($18,583)

Average Annual Return, Percent

24.96%

2.45%

6.39%

Columbia Threadneedle: MSCI EAFE Growth Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Growth Index (Net) ($20,466)

Average Annual Return, Percent

20.76%

4.43%

7.42%

Columbia Threadneedle: MSCI EAFE Growth Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Growth Index (Net) ($20,466)

Average Annual Return, Percent

20.76%

4.43%

7.42%

Columbia Threadneedle: MSCI EAFE Growth Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Growth Index (Net) ($20,466)

Average Annual Return, Percent

20.76%

4.43%

7.42%

Columbia Threadneedle: MSCI EAFE Growth Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Growth Index (Net) ($20,466)

Average Annual Return, Percent

20.76%

4.43%

7.42%

Columbia Threadneedle: MSCI EAFE Growth Index (Net)

Average Annual Return [Line Items]

Line Graph and Table Measure Name

MSCI EAFE Growth Index (Net) ($20,466)

Average Annual Return, Percent

20.76%

4.43%

7.42%

Columbia Threadneedle: Blended Benchmark - 50% S&P 500® Index, 50% Bloomberg U.S. Aggregate Bond Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

50% S&P 500<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">® Index, 50% Bloomberg U.S. Aggregate Bond Index ($22,613)

Average Annual Return, Percent

12.64%

6.99%

8.50%

Columbia Threadneedle: S&P 500® Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

S&P 500<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">® Index ($39,827)

Average Annual Return, Percent

17.88%

14.42%

14.82%

Columbia Threadneedle: Blended Benchmark - 50% S&P 500® Index, 50% Bloomberg U.S. Aggregate Bond Index

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Average Annual Return, Percent

12.64%

6.99%

8.50%

Columbia Threadneedle: S&P 500® Index