Shareholder Report, Average Annual Return (Details)
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6 Months Ended |
12 Months Ended |
60 Months Ended |
90 Months Ended |
120 Months Ended |
Mar. 31, 2026 |
Mar. 31, 2026 |
Mar. 31, 2026 |
Mar. 31, 2026 |
Mar. 31, 2026 |
| C000002851 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Equity Income Fund - Class AAA
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| C000243164 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Equity Income Fund - Class C
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| Average Annual Return, Percent |
2.92%
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14.48%
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7.09%
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8.03%
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| C000061072 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Equity Income Fund - Class I
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| C000002850 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Equity Income Fund - Class A
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| Average Annual Return, Percent |
(1.62%)
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9.83%
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6.65%
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8.22%
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| C000203681 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Global Financial Services Fund - Class A
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| Average Annual Return, Percent |
(0.59%)
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20.50%
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14.90%
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11.52%
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| C000203683 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Global Financial Services Fund - Class C
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| Average Annual Return, Percent |
4.07%
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25.82%
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15.37%
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11.52%
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| C000203680 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Global Financial Services Fund - Class I
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| C000203682 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Global Financial Services Fund - Class AAA
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| C000002861 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Focused Growth and Income Fund - Class AAA
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| C000002860 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Focused Growth and Income Fund - Class C
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| Average Annual Return, Percent |
4.62%
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3.93%
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5.47%
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5.25%
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| C000061074 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Focused Growth and Income Fund - Class I
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| C000002858 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Focused Growth and Income Fund - Class A
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| Average Annual Return, Percent |
0.16%
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0.06%
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5.34%
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5.58%
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| C000002855 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Small Cap Growth Fund - Class AAA
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| C000002857 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Small Cap Growth Fund - Class C
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| Average Annual Return, Percent |
2.03%
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15.43%
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7.01%
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9.20%
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| C000061073 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Small Cap Growth Fund - Class I
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| C000002854 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
The Gabelli Small Cap Growth Fund - Class A
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| Average Annual Return, Percent |
(2.53%)
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10.58%
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6.55%
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9.37%
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| Without Sales Load [Member] | C000002851 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.45%
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16.61%
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7.91%
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8.86%
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| Without Sales Load [Member] | C000243164 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.92%
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15.48%
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7.09%
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8.03%
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| Without Sales Load [Member] | C000061072 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.56%
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16.86%
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8.17%
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9.13%
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| Without Sales Load [Member] | C000002850 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.38%
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16.53%
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7.92%
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8.87%
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| Without Sales Load [Member] | C000203681 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.48%
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27.85%
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16.26%
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12.41%
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| Without Sales Load [Member] | C000203683 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.07%
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26.82%
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15.37%
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11.52%
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| Without Sales Load [Member] | C000203680 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.66%
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28.22%
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16.55%
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12.65%
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| Without Sales Load [Member] | C000203682 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.45%
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27.83%
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16.26%
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12.37%
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| Without Sales Load [Member] | C000002861 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.94%
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5.64%
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6.23%
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6.02%
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| Without Sales Load [Member] | C000002860 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.62%
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4.93%
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5.47%
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5.25%
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| Without Sales Load [Member] | C000061074 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
6.51%
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6.65%
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7.27%
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6.69%
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| Without Sales Load [Member] | C000002858 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
6.27%
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6.17%
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6.60%
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6.21%
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| Without Sales Load [Member] | C000002855 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.42%
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17.33%
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7.82%
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10.02%
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| Without Sales Load [Member] | C000002857 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.03%
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16.43%
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7.01%
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|
9.20%
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| Without Sales Load [Member] | C000061073 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.57%
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17.65%
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8.09%
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10.30%
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| Without Sales Load [Member] | C000002854 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.42%
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17.33%
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7.82%
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10.02%
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| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
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17.80%
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12.06%
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14.16%
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| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
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17.80%
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12.06%
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14.16%
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| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
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17.80%
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12.06%
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14.16%
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| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
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17.80%
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12.06%
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14.16%
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| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
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17.80%
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12.06%
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13.10%
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| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
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17.80%
|
12.06%
|
13.10%
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| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
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17.80%
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12.06%
|
13.10%
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| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
|
17.80%
|
12.06%
|
13.10%
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| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
|
17.80%
|
12.06%
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|
14.16%
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| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
|
17.80%
|
12.06%
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|
14.16%
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| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
|
17.80%
|
12.06%
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|
14.16%
|
| S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(1.79%)
|
17.80%
|
12.06%
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|
14.16%
|
| Russell 2000 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.10%
|
25.72%
|
3.77%
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|
9.88%
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| Russell 2000 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.10%
|
25.72%
|
3.77%
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|
9.88%
|
| Russell 2000 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.10%
|
25.72%
|
3.77%
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|
9.88%
|
| Russell 2000 Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.10%
|
25.72%
|
3.77%
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|
9.88%
|
| Lipper Equity Income Fund Average |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.14%
|
13.51%
|
9.46%
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|
10.60%
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| Lipper Equity Income Fund Average |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.14%
|
13.51%
|
9.46%
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|
10.60%
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| Lipper Equity Income Fund Average |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.14%
|
13.51%
|
9.46%
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|
10.60%
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| Lipper Equity Income Fund Average |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.14%
|
13.51%
|
9.46%
|
|
10.60%
|
| MSCI World Financials Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(2.49%)
|
13.38%
|
13.01%
|
11.30%
|
|
| S&P 500 Financials Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(7.52%)
|
0.72%
|
9.72%
|
10.22%
|
|
| MSCI World Financials Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(2.49%)
|
13.38%
|
13.01%
|
11.30%
|
|
| S&P 500 Financials Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(7.52%)
|
0.72%
|
9.72%
|
10.22%
|
|
| MSCI World Financials Index |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
(2.49%)
|
13.38%
|
13.01%
|
11.30%
|
|
| S&P 500 Financials Index |
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| Average Annual Return [Line Items] |
|
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| Average Annual Return, Percent |
(7.52%)
|
0.72%
|
9.72%
|
10.22%
|
|
| MSCI World Financials Index |
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| Average Annual Return [Line Items] |
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|
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| Average Annual Return, Percent |
(2.49%)
|
13.38%
|
13.01%
|
11.30%
|
|
| S&P 500 Financials Index |
|
|
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|
| Average Annual Return [Line Items] |
|
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|
|
|
| Average Annual Return, Percent |
(7.52%)
|
0.72%
|
9.72%
|
10.22%
|
|
| S&P Midcap 400 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.19%
|
17.35%
|
6.92%
|
|
10.58%
|
| S&P Midcap 400 |
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| Average Annual Return [Line Items] |
|
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|
|
|
| Average Annual Return, Percent |
4.19%
|
17.35%
|
6.92%
|
|
10.58%
|
| S&P Midcap 400 |
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| Average Annual Return [Line Items] |
|
|
|
|
|
| Average Annual Return, Percent |
4.19%
|
17.35%
|
6.92%
|
|
10.58%
|
| S&P Midcap 400 |
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|
|
|
|
| Average Annual Return [Line Items] |
|
|
|
|
|
| Average Annual Return, Percent |
4.19%
|
17.35%
|
6.92%
|
|
10.58%
|
| S&P SmallCap 600 Index |
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|
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| Average Annual Return [Line Items] |
|
|
|
|
|
| Average Annual Return, Percent |
5.27%
|
20.50%
|
4.49%
|
|
9.90%
|
| Lipper Small-Cap Core Funds Average |
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|
| Average Annual Return [Line Items] |
|
|
|
|
|
| Average Annual Return, Percent |
3.40%
|
17.94%
|
5.07%
|
|
9.66%
|
| S&P SmallCap 600 Index |
|
|
|
|
|
| Average Annual Return [Line Items] |
|
|
|
|
|
| Average Annual Return, Percent |
5.27%
|
20.50%
|
4.49%
|
|
9.90%
|
| Lipper Small-Cap Core Funds Average |
|
|
|
|
|
| Average Annual Return [Line Items] |
|
|
|
|
|
| Average Annual Return, Percent |
3.40%
|
17.94%
|
5.07%
|
|
9.66%
|
| S&P SmallCap 600 Index |
|
|
|
|
|
| Average Annual Return [Line Items] |
|
|
|
|
|
| Average Annual Return, Percent |
5.27%
|
20.50%
|
4.49%
|
|
9.90%
|
| Lipper Small-Cap Core Funds Average |
|
|
|
|
|
| Average Annual Return [Line Items] |
|
|
|
|
|
| Average Annual Return, Percent |
3.40%
|
17.94%
|
5.07%
|
|
9.66%
|
| S&P SmallCap 600 Index |
|
|
|
|
|
| Average Annual Return [Line Items] |
|
|
|
|
|
| Average Annual Return, Percent |
5.27%
|
20.50%
|
4.49%
|
|
9.90%
|
| Lipper Small-Cap Core Funds Average |
|
|
|
|
|
| Average Annual Return [Line Items] |
|
|
|
|
|
| Average Annual Return, Percent |
3.40%
|
17.94%
|
5.07%
|
|
9.66%
|