Shareholder Report, Average Annual Return (Details)
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12 Months Ended |
60 Months Ended |
120 Months Ended |
Aug. 31, 2026 |
Aug. 31, 2026 |
Aug. 31, 2026 |
| C000013178 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A with Maximum Sales Charge
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| Average Annual Return, Percent |
1.59%
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(0.05%)
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1.24%
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| C000013180 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C
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| Average Annual Return, Percent |
3.08%
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(0.15%)
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0.81%
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| C000063956 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I
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| C000013104 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A with Maximum Sales Charge
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| Average Annual Return, Percent |
1.87%
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(0.10%)
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1.28%
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| C000013106 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C
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| Average Annual Return, Percent |
3.56%
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(0.17%)
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0.87%
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| C000063947 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I
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| C000013120 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A with Maximum Sales Charge
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| Average Annual Return, Percent |
1.00%
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(0.35%)
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1.24%
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| C000013122 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C
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| Average Annual Return, Percent |
2.60%
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(0.41%)
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0.81%
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| C000092719 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I
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| C000013136 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A with Maximum Sales Charge
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| Average Annual Return, Percent |
1.53%
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(0.29%)
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1.04%
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| C000013138 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C
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| Average Annual Return, Percent |
3.24%
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(0.36%)
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0.63%
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| C000063950 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I
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| C000013142 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A with Maximum Sales Charge
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| Average Annual Return, Percent |
1.45%
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(0.23%)
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1.30%
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| C000013144 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C
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| Average Annual Return, Percent |
3.08%
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(0.33%)
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0.87%
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| C000092722 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I
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| C000013151 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A with Maximum Sales Charge
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| Average Annual Return, Percent |
2.53%
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(0.07%)
|
1.19%
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| C000013153 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C
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| Average Annual Return, Percent |
4.18%
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(0.15%)
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0.78%
|
| C000063952 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I
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| C000013157 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class A with Maximum Sales Charge
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| Average Annual Return, Percent |
2.08%
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(0.28%)
|
1.17%
|
| C000013159 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class C
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| Average Annual Return, Percent |
3.72%
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(0.38%)
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0.76%
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| C000063953 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Class I
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| Without Sales Load [Member] | C000013178 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.96%
|
0.61%
|
1.58%
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| Without Sales Load [Member] | C000013180 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.08%
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(0.15%)
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0.81%
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| Without Sales Load [Member] | C000063956 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.17%
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0.80%
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1.77%
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| Without Sales Load [Member] | C000013104 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.28%
|
0.57%
|
1.62%
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| Without Sales Load [Member] | C000013106 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.56%
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(0.17%)
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0.87%
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| Without Sales Load [Member] | C000063947 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.61%
|
0.77%
|
1.83%
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| Without Sales Load [Member] | C000013120 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.36%
|
0.32%
|
1.57%
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| Without Sales Load [Member] | C000013122 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.60%
|
(0.41%)
|
0.81%
|
| Without Sales Load [Member] | C000092719 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.56%
|
0.52%
|
1.76%
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| Without Sales Load [Member] | C000013136 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.90%
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0.37%
|
1.38%
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| Without Sales Load [Member] | C000013138 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.24%
|
(0.36%)
|
0.63%
|
| Without Sales Load [Member] | C000063950 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.23%
|
0.58%
|
1.59%
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| Without Sales Load [Member] | C000013142 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.86%
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0.43%
|
1.63%
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| Without Sales Load [Member] | C000013144 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.08%
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(0.33%)
|
0.87%
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| Without Sales Load [Member] | C000092722 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.07%
|
0.60%
|
1.83%
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| Without Sales Load [Member] | C000013151 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
6.00%
|
0.59%
|
1.52%
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| Without Sales Load [Member] | C000013153 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.18%
|
(0.15%)
|
0.78%
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| Without Sales Load [Member] | C000063952 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
6.21%
|
0.80%
|
1.73%
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| Without Sales Load [Member] | C000013157 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.46%
|
0.37%
|
1.51%
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| Without Sales Load [Member] | C000013159 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.72%
|
(0.38%)
|
0.76%
|
| Without Sales Load [Member] | C000063953 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.81%
|
0.58%
|
1.72%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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| Average Annual Return, Percent |
4.12%
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0.54%
|
1.91%
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| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
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| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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|
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| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
|
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| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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|
|
| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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|
| Average Annual Return [Line Items] |
|
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|
| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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|
|
| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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|
|
| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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|
|
| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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| Average Annual Return [Line Items] |
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|
| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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|
|
| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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|
| Average Annual Return [Line Items] |
|
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|
| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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|
|
| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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|
|
| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
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|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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|
|
| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Municipal Bond Index |
|
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|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Municipal Bond Index
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|
|
| Average Annual Return, Percent |
4.12%
|
0.54%
|
1.91%
|
| EATON VANCE Index: Bloomberg Georgia Municipal Bond Index |
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|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Georgia Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
3.80%
|
0.80%
|
1.91%
|
| EATON VANCE Index: Bloomberg Georgia Municipal Bond Index |
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|
| Average Annual Return [Line Items] |
|
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|
| Line Graph and Table Measure Name |
Bloomberg Georgia Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
3.80%
|
0.80%
|
1.91%
|
| EATON VANCE Index: Bloomberg Georgia Municipal Bond Index |
|
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|
| Average Annual Return [Line Items] |
|
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|
| Line Graph and Table Measure Name |
Bloomberg Georgia Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
3.80%
|
0.80%
|
1.91%
|
| EATON VANCE Index: Bloomberg Maryland Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Maryland Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
3.51%
|
0.39%
|
1.63%
|
| EATON VANCE Index: Bloomberg Maryland Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Maryland Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
3.51%
|
0.39%
|
1.63%
|
| EATON VANCE Index: Bloomberg Maryland Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Maryland Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
3.51%
|
0.39%
|
1.63%
|
| EATON VANCE Index: Bloomberg Missouri Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Missouri Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.60%
|
0.52%
|
1.97%
|
| EATON VANCE Index: Bloomberg Missouri Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Missouri Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.60%
|
0.52%
|
1.97%
|
| EATON VANCE Index: Bloomberg Missouri Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Missouri Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.60%
|
0.52%
|
1.97%
|
| EATON VANCE Index: Bloomberg North Carolina Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg North Carolina Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
3.84%
|
0.36%
|
1.62%
|
| EATON VANCE Index: Bloomberg North Carolina Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg North Carolina Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
3.84%
|
0.36%
|
1.62%
|
| EATON VANCE Index: Bloomberg North Carolina Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg North Carolina Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
3.84%
|
0.36%
|
1.62%
|
| EATON VANCE Index: Bloomberg Oregon Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Oregon Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.41%
|
0.29%
|
1.78%
|
| EATON VANCE Index: Bloomberg Oregon Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Oregon Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.41%
|
0.29%
|
1.78%
|
| EATON VANCE Index: Bloomberg Oregon Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Oregon Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.41%
|
0.29%
|
1.78%
|
| EATON VANCE Index: Bloomberg South Carolina Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg South Carolina Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.62%
|
0.67%
|
2.03%
|
| EATON VANCE Index: Bloomberg South Carolina Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg South Carolina Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.62%
|
0.67%
|
2.03%
|
| EATON VANCE Index: Bloomberg South Carolina Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg South Carolina Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.62%
|
0.67%
|
2.03%
|
| EATON VANCE Index: Bloomberg Virginia Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Virginia Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.07%
|
0.45%
|
1.71%
|
| EATON VANCE Index: Bloomberg Virginia Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Virginia Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.07%
|
0.45%
|
1.71%
|
| EATON VANCE Index: Bloomberg Virginia Municipal Bond Index |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Line Graph and Table Measure Name |
Bloomberg Virginia Municipal Bond Index
|
|
|
| Average Annual Return, Percent |
4.07%
|
0.45%
|
1.71%
|