| Form N-CSR Cover | 12 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | EATON VANCE MUNICIPALS TRUST |
| Entity Central Index Key | 0000778365 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 12 Months Ended |
| Sep. 30, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | EATON VANCE MUNICIPALS TRUST |
| Entity Central Index Key | 0000778365 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| C000013166 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance California Municipal Opportunities Fund |
| Class Name | Class A |
| Trading Symbol | EACAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance California Municipal Opportunities Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B19"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $79 0.75% |
| Expenses Paid, Amount | $ 79 |
| Expense Ratio, Percent | 0.75% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↓ Out-of-Index positions in variable-rate demand notes and floating-rate notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates generally declined during the period ↓ Security selections and an underweight position in the health care sector, which outperformed the Index, detracted from performance relative to the Index ↓ Security selections and an underweight position in A-rated bonds hampered performance as lower-rated bonds generally outperformed higher-rated bonds ↑ An overweight position in bonds with 17 years or more remaining to maturity contributed to Index-relative returns as longer-maturity bonds generally outperformed shorter-maturity bonds during the period ↑ Tactical short-term U.S. Treasury futures trades, which were not present at period-end, contributed to performance relative to the Index during the period ↑ Security selections in general obligation bonds contributed to returns relative to the Index during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class A with Maximum Sales Charge Bloomberg Municipal Bond Index Bloomberg California Municipal Bond Index 9/14 $9,675 $10,000 $10,000 10/14 $9,743 $10,069 $10,072 11/14 $9,745 $10,086 $10,084 12/14 $9,822 $10,137 $10,140 1/15 $9,995 $10,317 $10,314 2/15 $9,892 $10,210 $10,220 3/15 $9,932 $10,240 $10,252 4/15 $9,876 $10,186 $10,195 5/15 $9,878 $10,158 $10,172 6/15 $9,850 $10,148 $10,163 7/15 $9,909 $10,222 $10,240 8/15 $9,957 $10,242 $10,268 9/15 $10,054 $10,316 $10,339 10/15 $10,112 $10,357 $10,377 11/15 $10,189 $10,398 $10,417 12/15 $10,277 $10,472 $10,496 1/16 $10,413 $10,596 $10,611 2/16 $10,430 $10,613 $10,628 3/16 $10,495 $10,647 $10,664 4/16 $10,590 $10,725 $10,745 5/16 $10,654 $10,754 $10,776 6/16 $10,887 $10,925 $10,946 7/16 $10,861 $10,932 $10,951 8/16 $10,892 $10,947 $10,969 9/16 $10,842 $10,892 $10,902 10/16 $10,720 $10,778 $10,775 11/16 $10,266 $10,376 $10,360 12/16 $10,348 $10,497 $10,482 1/17 $10,391 $10,567 $10,564 2/17 $10,455 $10,640 $10,625 3/17 $10,489 $10,663 $10,646 4/17 $10,563 $10,741 $10,721 5/17 $10,708 $10,911 $10,900 6/17 $10,679 $10,872 $10,863 7/17 $10,743 $10,960 $10,959 8/17 $10,827 $11,043 $11,026 9/17 $10,776 $10,987 $10,975 10/17 $10,756 $11,014 $11,010 11/17 $10,716 $10,955 $10,951 12/17 $10,821 $11,069 $11,071 1/18 $10,687 $10,939 $10,939 2/18 $10,659 $10,906 $10,904 3/18 $10,713 $10,947 $10,953 4/18 $10,674 $10,908 $10,908 5/18 $10,845 $11,033 $11,055 6/18 $10,868 $11,042 $11,059 7/18 $10,881 $11,069 $11,085 8/18 $10,914 $11,097 $11,119 9/18 $10,832 $11,025 $11,034 10/18 $10,728 $10,957 $10,958 11/18 $10,826 $11,079 $11,072 12/18 $10,936 $11,211 $11,194 1/19 $10,991 $11,296 $11,267 2/19 $11,037 $11,357 $11,323 3/19 $11,255 $11,536 $11,509 4/19 $11,300 $11,579 $11,560 5/19 $11,474 $11,739 $11,729 6/19 $11,518 $11,782 $11,769 7/19 $11,605 $11,877 $11,868 8/19 $11,843 $12,065 $12,060 9/19 $11,755 $11,968 $11,970 10/19 $11,753 $11,989 $11,991 11/19 $11,763 $12,019 $12,018 12/19 $11,802 $12,056 $12,053 1/20 $11,997 $12,273 $12,269 2/20 $12,161 $12,431 $12,428 3/20 $11,665 $11,980 $11,994 4/20 $11,522 $11,830 $11,865 5/20 $11,908 $12,206 $12,267 6/20 $12,028 $12,307 $12,338 7/20 $12,266 $12,514 $12,550 8/20 $12,183 $12,455 $12,467 9/20 $12,175 $12,458 $12,463 10/20 $12,157 $12,420 $12,429 11/20 $12,373 $12,608 $12,621 12/20 $12,430 $12,685 $12,673 1/21 $12,476 $12,765 $12,734 2/21 $12,266 $12,563 $12,502 3/21 $12,298 $12,640 $12,589 4/21 $12,399 $12,746 $12,689 5/21 $12,433 $12,784 $12,724 6/21 $12,467 $12,819 $12,757 7/21 $12,571 $12,926 $12,863 8/21 $12,515 $12,878 $12,819 9/21 $12,426 $12,785 $12,725 10/21 $12,404 $12,748 $12,689 11/21 $12,496 $12,856 $12,802 12/21 $12,494 $12,877 $12,827 1/22 $12,187 $12,525 $12,447 2/22 $12,121 $12,480 $12,409 3/22 $11,736 $12,075 $11,996 4/22 $11,420 $11,741 $11,649 5/22 $11,540 $11,916 $11,845 6/22 $11,400 $11,720 $11,662 7/22 $11,626 $12,030 $11,990 8/22 $11,453 $11,766 $11,734 9/22 $11,140 $11,315 $11,300 10/22 $11,050 $11,221 $11,226 11/22 $11,518 $11,746 $11,742 12/22 $11,524 $11,779 $11,780 1/23 $11,855 $12,118 $12,098 2/23 $11,630 $11,844 $11,823 3/23 $11,836 $12,106 $12,081 4/23 $11,832 $12,079 $12,050 5/23 $11,757 $11,974 $11,950 6/23 $11,847 $12,094 $12,068 7/23 $11,878 $12,142 $12,117 8/23 $11,791 $11,967 $11,977 9/23 $11,516 $11,616 $11,633 10/23 $11,347 $11,517 $11,532 11/23 $12,014 $12,249 $12,237 12/23 $12,264 $12,533 $12,513 1/24 $12,262 $12,469 $12,462 2/24 $12,272 $12,485 $12,476 3/24 $12,282 $12,485 $12,461 4/24 $12,172 $12,330 $12,301 5/24 $12,181 $12,294 $12,264 6/24 $12,325 $12,482 $12,436 7/24 $12,432 $12,596 $12,547 8/24 $12,540 $12,696 $12,652 9/24 $12,691 $12,821 $12,781 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class A 10.16% 1.53% 2.74% Class A with 3.25% Maximum Sales Charge 6.53% 0.87% 2.41% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg California Municipal Bond Index 9.87% 1.32% 2.48% |
| AssetsNet | $ 942,281,175 |
| Holdings Count | Holding | 284 |
| Advisory Fees Paid, Amount | $ 3,457,213 |
| InvestmentCompanyPortfolioTurnover | 173% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $942,281,175 # of Portfolio Holdings 284 Portfolio Turnover Rate 173% Total Advisory Fees Paid $3,457,213 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 7.8% Housing 3.3% Electric Utilities 3.5% Other Revenue 3.6% Hospital 6.3% Education 7.9% Water and Sewer 11.6% Transportation 19.0% General Obligations 37.0% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Value Value Not Rated 2.5% BB 1.8% BBB 2.9% A 16.7% AA 60.7% AAA 15.4% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000013168 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance California Municipal Opportunities Fund |
| Class Name | Class C |
| Trading Symbol | ECCAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance California Municipal Opportunities Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B44"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $157 1.50% |
| Expenses Paid, Amount | $ 157 |
| Expense Ratio, Percent | 1.50% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↓ Out-of-Index positions in variable-rate demand notes and floating-rate notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates generally declined during the period ↓ Security selections and an underweight position in the health care sector, which outperformed the Index, detracted from performance relative to the Index ↓ Security selections and an underweight position in A-rated bonds hampered performance as lower-rated bonds generally outperformed higher-rated bonds ↑ An overweight position in bonds with 17 years or more remaining to maturity contributed to Index-relative returns as longer-maturity bonds generally outperformed shorter-maturity bonds during the period ↑ Tactical short-term U.S. Treasury futures trades, which were not present at period-end, contributed to performance relative to the Index during the period ↑ Security selections in general obligation bonds contributed to returns relative to the Index during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class C Bloomberg Municipal Bond Index Bloomberg California Municipal Bond Index 9/14 $10,000 $10,000 $10,000 10/14 $10,067 $10,069 $10,072 11/14 $10,060 $10,086 $10,084 12/14 $10,138 $10,137 $10,140 1/15 $10,301 $10,317 $10,314 2/15 $10,187 $10,210 $10,220 3/15 $10,223 $10,240 $10,252 4/15 $10,163 $10,186 $10,195 5/15 $10,156 $10,158 $10,172 6/15 $10,117 $10,148 $10,163 7/15 $10,184 $10,222 $10,240 8/15 $10,229 $10,242 $10,268 9/15 $10,317 $10,316 $10,339 10/15 $10,371 $10,357 $10,377 11/15 $10,438 $10,398 $10,417 12/15 $10,526 $10,472 $10,496 1/16 $10,656 $10,596 $10,611 2/16 $10,666 $10,613 $10,628 3/16 $10,730 $10,647 $10,664 4/16 $10,815 $10,725 $10,745 5/16 $10,877 $10,754 $10,776 6/16 $11,103 $10,925 $10,946 7/16 $11,065 $10,932 $10,951 8/16 $11,091 $10,947 $10,969 9/16 $11,037 $10,892 $10,902 10/16 $10,906 $10,778 $10,775 11/16 $10,443 $10,376 $10,360 12/16 $10,525 $10,497 $10,482 1/17 $10,552 $10,567 $10,564 2/17 $10,614 $10,640 $10,625 3/17 $10,642 $10,663 $10,646 4/17 $10,704 $10,741 $10,721 5/17 $10,843 $10,911 $10,900 6/17 $10,814 $10,872 $10,863 7/17 $10,864 $10,960 $10,959 8/17 $10,947 $11,043 $11,026 9/17 $10,883 $10,987 $10,975 10/17 $10,864 $11,014 $11,010 11/17 $10,822 $10,955 $10,951 12/17 $10,917 $11,069 $11,071 1/18 $10,774 $10,939 $10,939 2/18 $10,735 $10,906 $10,904 3/18 $10,786 $10,947 $10,953 4/18 $10,746 $10,908 $10,908 5/18 $10,911 $11,033 $11,055 6/18 $10,917 $11,042 $11,059 7/18 $10,922 $11,069 $11,085 8/18 $10,961 $11,097 $11,119 9/18 $10,874 $11,025 $11,034 10/18 $10,752 $10,957 $10,958 11/18 $10,851 $11,079 $11,072 12/18 $10,949 $11,211 $11,194 1/19 $11,000 $11,296 $11,267 2/19 $11,042 $11,357 $11,323 3/19 $11,244 $11,536 $11,509 4/19 $11,284 $11,579 $11,560 5/19 $11,452 $11,739 $11,729 6/19 $11,491 $11,782 $11,769 7/19 $11,575 $11,877 $11,868 8/19 $11,799 $12,065 $12,060 9/19 $11,707 $11,968 $11,970 10/19 $11,696 $11,989 $11,991 11/19 $11,698 $12,019 $12,018 12/19 $11,730 $12,056 $12,053 1/20 $11,920 $12,273 $12,269 2/20 $12,075 $12,431 $12,428 3/20 $11,569 $11,980 $11,994 4/20 $11,430 $11,830 $11,865 5/20 $11,800 $12,206 $12,267 6/20 $11,907 $12,307 $12,338 7/20 $12,141 $12,514 $12,550 8/20 $12,043 $12,455 $12,467 9/20 $12,038 $12,458 $12,463 10/20 $12,010 $12,420 $12,429 11/20 $12,220 $12,608 $12,621 12/20 $12,260 $12,685 $12,673 1/21 $12,301 $12,765 $12,734 2/21 $12,080 $12,563 $12,502 3/21 $12,106 $12,640 $12,589 4/21 $12,193 $12,746 $12,689 5/21 $12,232 $12,784 $12,724 6/21 $12,248 $12,819 $12,757 7/21 $12,337 $12,926 $12,863 8/21 $12,281 $12,878 $12,819 9/21 $12,178 $12,785 $12,725 10/21 $12,158 $12,748 $12,689 11/21 $12,247 $12,856 $12,802 12/21 $12,224 $12,877 $12,827 1/22 $11,927 $12,525 $12,447 2/22 $11,849 $12,480 $12,409 3/22 $11,469 $12,075 $11,996 4/22 $11,151 $11,741 $11,649 5/22 $11,257 $11,916 $11,845 6/22 $11,113 $11,720 $11,662 7/22 $11,330 $12,030 $11,990 8/22 $11,151 $11,766 $11,734 9/22 $10,849 $11,315 $11,300 10/22 $10,746 $11,221 $11,226 11/22 $11,205 $11,746 $11,742 12/22 $11,201 $11,779 $11,780 1/23 $11,504 $12,118 $12,098 2/23 $11,282 $11,844 $11,823 3/23 $11,476 $12,106 $12,081 4/23 $11,462 $12,079 $12,050 5/23 $11,387 $11,974 $11,950 6/23 $11,459 $12,094 $12,068 7/23 $11,494 $12,142 $12,117 8/23 $11,393 $11,967 $11,977 9/23 $11,133 $11,616 $11,633 10/23 $10,960 $11,517 $11,532 11/23 $11,597 $12,249 $12,237 12/23 $11,823 $12,533 $12,513 1/24 $11,822 $12,469 $12,462 2/24 $11,824 $12,485 $12,476 3/24 $11,824 $12,485 $12,461 4/24 $11,711 $12,330 $12,301 5/24 $11,712 $12,294 $12,264 6/24 $11,838 $12,482 $12,436 7/24 $11,927 $12,596 $12,547 8/24 $12,029 $12,696 $12,652 9/24 $12,355 $12,821 $12,781 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class C 9.20% 0.76% 2.14% Class C with 1% Maximum Deferred Sales Charge 8.20% 0.76% 2.14% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg California Municipal Bond Index 9.87% 1.32% 2.48% |
| AssetsNet | $ 942,281,175 |
| Holdings Count | Holding | 284 |
| Advisory Fees Paid, Amount | $ 3,457,213 |
| InvestmentCompanyPortfolioTurnover | 173% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $942,281,175 # of Portfolio Holdings 284 Portfolio Turnover Rate 173% Total Advisory Fees Paid $3,457,213 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 7.8% Housing 3.3% Electric Utilities 3.5% Other Revenue 3.6% Hospital 6.3% Education 7.9% Water and Sewer 11.6% Transportation 19.0% General Obligations 37.0% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Value Value Not Rated 2.5% BB 1.8% BBB 2.9% A 16.7% AA 60.7% AAA 15.4% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000063954 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance California Municipal Opportunities Fund |
| Class Name | Class I |
| Trading Symbol | EICAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance California Municipal Opportunities Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B69"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $53 0.50% |
| Expenses Paid, Amount | $ 53 |
| Expense Ratio, Percent | 0.50% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↓ Out-of-Index positions in variable-rate demand notes and floating-rate notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates generally declined during the period ↓ Security selections and an underweight position in the health care sector, which outperformed the Index, detracted from performance relative to the Index ↓ Security selections and an underweight position in A-rated bonds hampered performance as lower-rated bonds generally outperformed higher-rated bonds ↑ An overweight position in bonds with 17 years or more remaining to maturity contributed to Index-relative returns as longer-maturity bonds generally outperformed shorter-maturity bonds during the period ↑ Tactical short-term U.S. Treasury futures trades, which were not present at period-end, contributed to performance relative to the Index during the period ↑ Security selections in general obligation bonds contributed to returns relative to the Index during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class I Bloomberg Municipal Bond Index Bloomberg California Municipal Bond Index 9/14 $1,000,000 $1,000,000 $1,000,000 10/14 $1,007,255 $1,006,857 $1,007,201 11/14 $1,007,637 $1,008,598 $1,008,428 12/14 $1,015,843 $1,013,687 $1,014,004 1/15 $1,033,945 $1,031,654 $1,031,413 2/15 $1,023,432 $1,021,012 $1,022,047 3/15 $1,027,812 $1,023,960 $1,025,161 4/15 $1,022,274 $1,018,588 $1,019,499 5/15 $1,021,687 $1,015,774 $1,017,165 6/15 $1,019,030 $1,014,848 $1,016,347 7/15 $1,026,384 $1,022,199 $1,023,967 8/15 $1,031,567 $1,024,207 $1,026,821 9/15 $1,041,803 $1,031,626 $1,033,922 10/15 $1,047,970 $1,035,727 $1,037,703 11/15 $1,055,218 $1,039,845 $1,041,738 12/15 $1,065,492 $1,047,151 $1,049,604 1/16 $1,079,832 $1,059,645 $1,061,123 2/16 $1,081,781 $1,061,312 $1,062,846 3/16 $1,088,808 $1,064,674 $1,066,410 4/16 $1,098,885 $1,072,502 $1,074,461 5/16 $1,105,723 $1,075,403 $1,077,559 6/16 $1,130,147 $1,092,511 $1,094,634 7/16 $1,127,607 $1,093,178 $1,095,109 8/16 $1,131,127 $1,094,653 $1,096,942 9/16 $1,126,090 $1,089,190 $1,090,244 10/16 $1,112,678 $1,077,763 $1,077,539 11/16 $1,066,822 $1,037,568 $1,035,996 12/16 $1,075,590 $1,049,749 $1,048,182 1/17 $1,080,214 $1,056,669 $1,056,392 2/17 $1,087,131 $1,064,007 $1,062,544 3/17 $1,089,765 $1,066,317 $1,064,616 4/17 $1,098,759 $1,074,054 $1,072,081 5/17 $1,114,080 $1,091,100 $1,089,959 6/17 $1,111,297 $1,087,187 $1,086,326 7/17 $1,118,167 $1,095,983 $1,095,887 8/17 $1,127,118 $1,104,323 $1,102,634 9/17 $1,122,088 $1,098,708 $1,097,483 10/17 $1,120,235 $1,101,390 $1,101,048 11/17 $1,116,267 $1,095,493 $1,095,147 12/17 $1,127,472 $1,106,943 $1,107,144 1/18 $1,113,824 $1,093,911 $1,093,900 2/18 $1,111,072 $1,090,642 $1,090,366 3/18 $1,116,974 $1,094,668 $1,095,266 4/18 $1,113,118 $1,090,761 $1,090,835 5/18 $1,131,145 $1,103,252 $1,105,531 6/18 $1,132,725 $1,104,193 $1,105,882 7/18 $1,135,381 $1,106,873 $1,108,498 8/18 $1,139,089 $1,109,715 $1,111,947 9/18 $1,130,725 $1,102,531 $1,103,429 10/18 $1,120,092 $1,095,742 $1,095,840 11/18 $1,130,616 $1,107,870 $1,107,244 12/18 $1,142,260 $1,121,135 $1,119,440 1/19 $1,148,313 $1,129,609 $1,126,745 2/19 $1,153,362 $1,135,658 $1,132,328 3/19 $1,175,195 $1,153,610 $1,150,940 4/19 $1,180,148 $1,157,945 $1,155,960 5/19 $1,198,572 $1,173,909 $1,172,919 6/19 $1,204,626 $1,178,244 $1,176,925 7/19 $1,213,958 $1,187,739 $1,186,758 8/19 $1,239,055 $1,206,474 $1,205,991 9/19 $1,230,122 $1,196,803 $1,197,022 10/19 $1,230,210 $1,198,948 $1,199,129 11/19 $1,231,491 $1,201,946 $1,201,850 12/19 $1,235,774 $1,205,616 $1,205,306 1/20 $1,256,500 $1,227,277 $1,226,897 2/20 $1,273,859 $1,243,103 $1,242,783 3/20 $1,221,059 $1,198,012 $1,199,387 4/20 $1,207,454 $1,182,977 $1,186,549 5/20 $1,246,975 $1,220,609 $1,226,740 6/20 $1,259,696 $1,230,655 $1,233,791 7/20 $1,286,077 $1,251,382 $1,254,988 8/20 $1,276,428 $1,245,511 $1,246,658 9/20 $1,277,103 $1,245,775 $1,246,307 10/20 $1,275,430 $1,242,033 $1,242,879 11/20 $1,298,354 $1,260,776 $1,262,057 12/20 $1,304,636 $1,268,456 $1,267,330 1/21 $1,309,744 $1,276,540 $1,273,370 2/21 $1,286,744 $1,256,257 $1,250,246 3/21 $1,291,574 $1,264,005 $1,258,852 4/21 $1,301,294 $1,274,607 $1,268,876 5/21 $1,306,273 $1,278,410 $1,272,352 6/21 $1,310,159 $1,281,920 $1,275,669 7/21 $1,320,075 $1,292,552 $1,286,286 8/21 $1,315,702 $1,287,808 $1,281,941 9/21 $1,305,481 $1,278,514 $1,272,481 10/21 $1,303,434 $1,274,776 $1,268,884 11/21 $1,314,541 $1,285,628 $1,280,235 12/21 $1,313,401 $1,287,702 $1,282,742 1/22 $1,282,637 $1,252,454 $1,244,707 2/22 $1,275,960 $1,247,967 $1,240,944 3/22 $1,234,484 $1,207,512 $1,199,646 4/22 $1,201,506 $1,174,113 $1,164,863 5/22 $1,214,361 $1,191,554 $1,184,523 6/22 $1,199,885 $1,172,038 $1,166,153 7/22 $1,225,132 $1,203,006 $1,199,040 8/22 $1,205,975 $1,176,640 $1,173,373 9/22 $1,174,510 $1,131,480 $1,130,002 10/22 $1,164,095 $1,122,070 $1,122,638 11/22 $1,214,809 $1,174,553 $1,174,228 12/22 $1,215,699 $1,177,916 $1,178,004 1/23 $1,249,679 $1,211,751 $1,209,811 2/23 $1,227,383 $1,184,351 $1,182,308 3/23 $1,248,122 $1,210,629 $1,208,077 4/23 $1,247,925 $1,207,864 $1,205,032 5/23 $1,241,574 $1,197,397 $1,194,956 6/23 $1,250,090 $1,209,391 $1,206,797 7/23 $1,254,841 $1,214,176 $1,211,677 8/23 $1,244,690 $1,196,696 $1,197,679 9/23 $1,217,135 $1,161,622 $1,163,285 10/23 $1,199,630 $1,151,737 $1,153,209 11/23 $1,270,308 $1,224,851 $1,223,701 12/23 $1,295,700 $1,253,319 $1,251,318 1/24 $1,296,988 $1,246,918 $1,246,229 2/24 $1,298,393 $1,248,519 $1,247,625 3/24 $1,298,437 $1,248,480 $1,246,073 4/24 $1,288,281 $1,233,018 $1,230,144 5/24 $1,288,320 $1,229,401 $1,226,387 6/24 $1,305,066 $1,248,245 $1,243,601 7/24 $1,315,376 $1,259,622 $1,254,672 8/24 $1,328,400 $1,269,557 $1,265,163 9/24 $1,342,862 $1,282,104 $1,278,053 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class I 10.32% 1.77% 2.99% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg California Municipal Bond Index 9.87% 1.32% 2.48% |
| AssetsNet | $ 942,281,175 |
| Holdings Count | Holding | 284 |
| Advisory Fees Paid, Amount | $ 3,457,213 |
| InvestmentCompanyPortfolioTurnover | 173% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $942,281,175 # of Portfolio Holdings 284 Portfolio Turnover Rate 173% Total Advisory Fees Paid $3,457,213 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 7.8% Housing 3.3% Electric Utilities 3.5% Other Revenue 3.6% Hospital 6.3% Education 7.9% Water and Sewer 11.6% Transportation 19.0% General Obligations 37.0% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Value Value Not Rated 2.5% BB 1.8% BBB 2.9% A 16.7% AA 60.7% AAA 15.4% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000013108 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance Massachusetts Municipal Income Fund |
| Class Name | Class A |
| Trading Symbol | ETMAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance Massachusetts Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B94"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $85 0.81% |
| Expenses Paid, Amount | $ 85 |
| Expense Ratio, Percent | 0.81% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↓ Out-of-Index positions in variable-rate demand notes and floating-rate notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates generally declined during the period ↓ Security selections in the health care sector detracted from performance relative to the Index during the period ↓ Security selections in the housing sector detracted from performance relative to the Index during the period ↑ An overweight position in bonds rated BBB and below helped returns as lower-credit-quality bonds generally outperformed higher-credit-quality bonds ↑ An overweight position in bonds with 17 years or more remaining to maturity contributed to Index-relative returns as longer-maturity bonds generally outperformed shorter-maturity bonds during the period ↑ An overweight position in 4% coupon bonds contributed to Index-relative returns as interest rates generally declined during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class A with Maximum Sales Charge Bloomberg Municipal Bond Index Bloomberg Massachusetts Municipal Bond Index 9/14 $9,675 $10,000 $10,000 10/14 $9,757 $10,069 $10,060 11/14 $9,728 $10,086 $10,073 12/14 $9,811 $10,137 $10,130 1/15 $9,967 $10,317 $10,314 2/15 $9,845 $10,210 $10,186 3/15 $9,884 $10,240 $10,223 4/15 $9,816 $10,186 $10,160 5/15 $9,779 $10,158 $10,143 6/15 $9,775 $10,148 $10,130 7/15 $9,836 $10,222 $10,211 8/15 $9,875 $10,242 $10,241 9/15 $9,926 $10,316 $10,320 10/15 $9,970 $10,357 $10,349 11/15 $10,043 $10,398 $10,390 12/15 $10,140 $10,472 $10,462 1/16 $10,230 $10,596 $10,586 2/16 $10,180 $10,613 $10,601 3/16 $10,243 $10,647 $10,629 4/16 $10,339 $10,725 $10,705 5/16 $10,366 $10,754 $10,727 6/16 $10,530 $10,925 $10,906 7/16 $10,479 $10,932 $10,913 8/16 $10,506 $10,947 $10,913 9/16 $10,442 $10,892 $10,851 10/16 $10,344 $10,778 $10,741 11/16 $9,927 $10,376 $10,304 12/16 $10,070 $10,497 $10,441 1/17 $10,086 $10,567 $10,506 2/17 $10,138 $10,640 $10,580 3/17 $10,178 $10,663 $10,603 4/17 $10,239 $10,741 $10,678 5/17 $10,392 $10,911 $10,854 6/17 $10,350 $10,872 $10,806 7/17 $10,411 $10,960 $10,888 8/17 $10,484 $11,043 $10,973 9/17 $10,441 $10,987 $10,894 10/17 $10,445 $11,014 $10,919 11/17 $10,393 $10,955 $10,862 12/17 $10,529 $11,069 $10,974 1/18 $10,368 $10,939 $10,829 2/18 $10,325 $10,906 $10,793 3/18 $10,388 $10,947 $10,843 4/18 $10,354 $10,908 $10,794 5/18 $10,452 $11,033 $10,914 6/18 $10,454 $11,042 $10,921 7/18 $10,467 $11,069 $10,943 8/18 $10,470 $11,097 $10,974 9/18 $10,423 $11,025 $10,892 10/18 $10,352 $10,957 $10,825 11/18 $10,452 $11,079 $10,960 12/18 $10,563 $11,211 $11,096 1/19 $10,626 $11,296 $11,172 2/19 $10,689 $11,357 $11,233 3/19 $10,838 $11,536 $11,403 4/19 $10,889 $11,579 $11,448 5/19 $11,013 $11,739 $11,593 6/19 $11,051 $11,782 $11,635 7/19 $11,125 $11,877 $11,727 8/19 $11,310 $12,065 $11,910 9/19 $11,202 $11,968 $11,819 10/19 $11,200 $11,989 $11,847 11/19 $11,199 $12,019 $11,870 12/19 $11,223 $12,056 $11,902 1/20 $11,436 $12,273 $12,114 2/20 $11,601 $12,431 $12,251 3/20 $11,210 $11,980 $11,930 4/20 $11,033 $11,830 $11,818 5/20 $11,361 $12,206 $12,207 6/20 $11,436 $12,307 $12,210 7/20 $11,611 $12,514 $12,410 8/20 $11,557 $12,455 $12,340 9/20 $11,553 $12,458 $12,348 10/20 $11,523 $12,420 $12,312 11/20 $11,661 $12,608 $12,479 12/20 $11,721 $12,685 $12,531 1/21 $11,751 $12,765 $12,588 2/21 $11,563 $12,563 $12,367 3/21 $11,605 $12,640 $12,450 4/21 $11,687 $12,746 $12,551 5/21 $11,718 $12,784 $12,571 6/21 $11,749 $12,819 $12,595 7/21 $11,830 $12,926 $12,697 8/21 $11,795 $12,878 $12,654 9/21 $11,695 $12,785 $12,551 10/21 $11,673 $12,748 $12,517 11/21 $11,757 $12,856 $12,627 12/21 $11,750 $12,877 $12,649 1/22 $11,451 $12,525 $12,289 2/22 $11,391 $12,480 $12,250 3/22 $11,027 $12,075 $11,862 4/22 $10,651 $11,741 $11,528 5/22 $10,736 $11,916 $11,706 6/22 $10,559 $11,720 $11,528 7/22 $10,872 $12,030 $11,817 8/22 $10,590 $11,766 $11,578 9/22 $10,187 $11,315 $11,137 10/22 $10,132 $11,221 $11,056 11/22 $10,625 $11,746 $11,564 12/22 $10,610 $11,779 $11,586 1/23 $10,918 $12,118 $11,902 2/23 $10,662 $11,844 $11,637 3/23 $10,877 $12,106 $11,901 4/23 $10,876 $12,079 $11,862 5/23 $10,781 $11,974 $11,755 6/23 $10,863 $12,094 $11,841 7/23 $10,863 $12,142 $11,881 8/23 $10,768 $11,967 $11,712 9/23 $10,468 $11,616 $11,383 10/23 $10,291 $11,517 $11,299 11/23 $10,966 $12,249 $11,961 12/23 $11,216 $12,533 $12,236 1/24 $11,203 $12,469 $12,182 2/24 $11,191 $12,485 $12,193 3/24 $11,179 $12,485 $12,190 4/24 $11,057 $12,330 $12,030 5/24 $10,990 $12,294 $11,981 6/24 $11,189 $12,482 $12,154 7/24 $11,291 $12,596 $12,280 8/24 $11,351 $12,696 $12,392 9/24 $11,477 $12,821 $12,514 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class A 9.68% 0.49% 1.73% Class A with 3.25% Maximum Sales Charge 6.07% (0.16)% 1.39% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg Massachusetts Municipal Bond Index 9.94% 1.15% 2.27% |
| AssetsNet | $ 166,484,049 |
| Holdings Count | Holding | 85 |
| Advisory Fees Paid, Amount | $ 571,899 |
| InvestmentCompanyPortfolioTurnover | 57% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $166,484,049 # of Portfolio Holdings 85 Portfolio Turnover Rate 57% Total Advisory Fees Paid $571,899 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 10.2% Water and Sewer 3.3% Housing 4.3% Special Tax Revenue 8.4% Transportation 10.9% Hospital 14.2% General Obligations 21.3% Education 27.4% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 3.3% B 0.8% BB 2.3% BBB 9.7% A 12.4% AA 49.8% AAA 21.7% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000034083 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance Massachusetts Municipal Income Fund |
| Class Name | Class C |
| Trading Symbol | ECMMX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance Massachusetts Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B119"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $163 1.56% |
| Expenses Paid, Amount | $ 163 |
| Expense Ratio, Percent | 1.56% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↓ Out-of-Index positions in variable-rate demand notes and floating-rate notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates generally declined during the period ↓ Security selections in the health care sector detracted from performance relative to the Index during the period ↓ Security selections in the housing sector detracted from performance relative to the Index during the period ↑ An overweight position in bonds rated BBB and below helped returns as lower-credit-quality bonds generally outperformed higher-credit-quality bonds ↑ An overweight position in bonds with 17 years or more remaining to maturity contributed to Index-relative returns as longer-maturity bonds generally outperformed shorter-maturity bonds during the period ↑ An overweight position in 4% coupon bonds contributed to Index-relative returns as interest rates generally declined during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class C Bloomberg Municipal Bond Index Bloomberg Massachusetts Municipal Bond Index 9/14 $10,000 $10,000 $10,000 10/14 $10,089 $10,069 $10,060 11/14 $10,054 $10,086 $10,073 12/14 $10,121 $10,137 $10,130 1/15 $10,287 $10,317 $10,314 2/15 $10,145 $10,210 $10,186 3/15 $10,178 $10,240 $10,223 4/15 $10,101 $10,186 $10,160 5/15 $10,068 $10,158 $10,143 6/15 $10,047 $10,148 $10,130 7/15 $10,103 $10,222 $10,211 8/15 $10,149 $10,242 $10,241 9/15 $10,195 $10,316 $10,320 10/15 $10,221 $10,357 $10,349 11/15 $10,290 $10,398 $10,390 12/15 $10,395 $10,472 $10,462 1/16 $10,480 $10,596 $10,586 2/16 $10,423 $10,613 $10,601 3/16 $10,481 $10,647 $10,629 4/16 $10,572 $10,725 $10,705 5/16 $10,593 $10,754 $10,727 6/16 $10,754 $10,925 $10,906 7/16 $10,695 $10,932 $10,913 8/16 $10,716 $10,947 $10,913 9/16 $10,644 $10,892 $10,851 10/16 $10,537 $10,778 $10,741 11/16 $10,107 $10,376 $10,304 12/16 $10,246 $10,497 $10,441 1/17 $10,245 $10,567 $10,506 2/17 $10,291 $10,640 $10,580 3/17 $10,336 $10,663 $10,603 4/17 $10,380 $10,741 $10,678 5/17 $10,529 $10,911 $10,854 6/17 $10,480 $10,872 $10,806 7/17 $10,546 $10,960 $10,888 8/17 $10,602 $11,043 $10,973 9/17 $10,552 $10,987 $10,894 10/17 $10,550 $11,014 $10,919 11/17 $10,502 $10,955 $10,862 12/17 $10,621 $11,069 $10,974 1/18 $10,464 $10,939 $10,829 2/18 $10,415 $10,906 $10,793 3/18 $10,472 $10,947 $10,843 4/18 $10,431 $10,908 $10,794 5/18 $10,522 $11,033 $10,914 6/18 $10,506 $11,042 $10,921 7/18 $10,525 $11,069 $10,943 8/18 $10,521 $11,097 $10,974 9/18 $10,468 $11,025 $10,892 10/18 $10,378 $10,957 $10,825 11/18 $10,472 $11,079 $10,960 12/18 $10,589 $11,211 $11,096 1/19 $10,632 $11,296 $11,172 2/19 $10,702 $11,357 $11,233 3/19 $10,831 $11,536 $11,403 4/19 $10,876 $11,579 $11,448 5/19 $11,005 $11,739 $11,593 6/19 $11,024 $11,782 $11,635 7/19 $11,103 $11,877 $11,727 8/19 $11,268 $12,065 $11,910 9/19 $11,153 $11,968 $11,819 10/19 $11,144 $11,989 $11,847 11/19 $11,149 $12,019 $11,870 12/19 $11,166 $12,056 $11,902 1/20 $11,371 $12,273 $12,114 2/20 $11,515 $12,431 $12,251 3/20 $11,120 $11,980 $11,930 4/20 $10,938 $11,830 $11,818 5/20 $11,257 $12,206 $12,207 6/20 $11,325 $12,307 $12,210 7/20 $11,492 $12,514 $12,410 8/20 $11,431 $12,455 $12,340 9/20 $11,421 $12,458 $12,348 10/20 $11,386 $12,420 $12,312 11/20 $11,516 $12,608 $12,479 12/20 $11,569 $12,685 $12,531 1/21 $11,592 $12,765 $12,588 2/21 $11,399 $12,563 $12,367 3/21 $11,421 $12,640 $12,450 4/21 $11,494 $12,746 $12,551 5/21 $11,517 $12,784 $12,571 6/21 $11,541 $12,819 $12,595 7/21 $11,626 $12,926 $12,697 8/21 $11,584 $12,878 $12,654 9/21 $11,466 $12,785 $12,551 10/21 $11,450 $12,748 $12,517 11/21 $11,525 $12,856 $12,627 12/21 $11,511 $12,877 $12,649 1/22 $11,211 $12,525 $12,289 2/22 $11,132 $12,480 $12,250 3/22 $10,769 $12,075 $11,862 4/22 $10,395 $11,741 $11,528 5/22 $10,485 $11,916 $11,706 6/22 $10,306 $11,720 $11,528 7/22 $10,592 $12,030 $11,817 8/22 $10,323 $11,766 $11,578 9/22 $9,924 $11,315 $11,137 10/22 $9,850 $11,221 $11,056 11/22 $10,324 $11,746 $11,564 12/22 $10,316 $11,779 $11,586 1/23 $10,609 $12,118 $11,902 2/23 $10,354 $11,844 $11,637 3/23 $10,556 $12,106 $11,901 4/23 $10,549 $12,079 $11,862 5/23 $10,450 $11,974 $11,755 6/23 $10,510 $12,094 $11,841 7/23 $10,517 $12,142 $11,881 8/23 $10,418 $11,967 $11,712 9/23 $10,121 $11,616 $11,383 10/23 $9,943 $11,517 $11,299 11/23 $10,590 $12,249 $11,961 12/23 $10,824 $12,533 $12,236 1/24 $10,791 $12,469 $12,182 2/24 $10,787 $12,485 $12,193 3/24 $10,769 $12,485 $12,190 4/24 $10,644 $12,330 $12,030 5/24 $10,572 $12,294 $11,981 6/24 $10,758 $12,482 $12,154 7/24 $10,849 $12,596 $12,280 8/24 $10,899 $12,696 $12,392 9/24 $11,184 $12,821 $12,514 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class C 8.86% (0.24)% 1.12% Class C with 1% Maximum Deferred Sales Charge 7.86% (0.24)% 1.12% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg Massachusetts Municipal Bond Index 9.94% 1.15% 2.27% |
| AssetsNet | $ 166,484,049 |
| Holdings Count | Holding | 85 |
| Advisory Fees Paid, Amount | $ 571,899 |
| InvestmentCompanyPortfolioTurnover | 57% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $166,484,049 # of Portfolio Holdings 85 Portfolio Turnover Rate 57% Total Advisory Fees Paid $571,899 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 10.2% Water and Sewer 3.3% Housing 4.3% Special Tax Revenue 8.4% Transportation 10.9% Hospital 14.2% General Obligations 21.3% Education 27.4% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 3.3% B 0.8% BB 2.3% BBB 9.7% A 12.4% AA 49.8% AAA 21.7% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000013110 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance Massachusetts Municipal Income Fund |
| Class Name | Class I |
| Trading Symbol | EIMAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance Massachusetts Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B144"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $64 0.61% |
| Expenses Paid, Amount | $ 64 |
| Expense Ratio, Percent | 0.61% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↓ Out-of-Index positions in variable-rate demand notes and floating-rate notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates generally declined during the period ↓ Security selections in the health care sector detracted from performance relative to the Index during the period ↓ Security selections in the housing sector detracted from performance relative to the Index during the period ↑ An overweight position in bonds rated BBB and below helped returns as lower-credit-quality bonds generally outperformed higher-credit-quality bonds ↑ An overweight position in bonds with 17 years or more remaining to maturity contributed to Index-relative returns as longer-maturity bonds generally outperformed shorter-maturity bonds during the period ↑ An overweight position in 4% coupon bonds contributed to Index-relative returns as interest rates generally declined during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class I Bloomberg Municipal Bond Index Bloomberg Massachusetts Municipal Bond Index 9/14 $1,000,000 $1,000,000 $1,000,000 10/14 $1,008,636 $1,006,857 $1,006,017 11/14 $1,005,856 $1,008,598 $1,007,316 12/14 $1,013,416 $1,013,687 $1,012,952 1/15 $1,030,893 $1,031,654 $1,031,362 2/15 $1,017,340 $1,021,012 $1,018,557 3/15 $1,022,668 $1,023,960 $1,022,252 4/15 $1,014,604 $1,018,588 $1,015,972 5/15 $1,012,074 $1,015,774 $1,014,267 6/15 $1,010,694 $1,014,848 $1,012,981 7/15 $1,017,230 $1,022,199 $1,021,102 8/15 $1,022,612 $1,024,207 $1,024,066 9/15 $1,028,051 $1,031,626 $1,032,040 10/15 $1,032,712 $1,035,727 $1,034,924 11/15 $1,040,475 $1,039,845 $1,038,956 12/15 $1,050,744 $1,047,151 $1,046,151 1/16 $1,060,111 $1,059,645 $1,058,642 2/16 $1,055,198 $1,061,312 $1,060,105 3/16 $1,061,864 $1,064,674 $1,062,950 4/16 $1,071,941 $1,072,502 $1,070,538 5/16 $1,074,955 $1,075,403 $1,072,719 6/16 $1,092,154 $1,092,511 $1,090,559 7/16 $1,087,064 $1,093,178 $1,091,307 8/16 $1,090,040 $1,094,653 $1,091,254 9/16 $1,083,601 $1,089,190 $1,085,064 10/16 $1,073,560 $1,077,763 $1,074,086 11/16 $1,030,524 $1,037,568 $1,030,438 12/16 $1,045,460 $1,049,749 $1,044,109 1/17 $1,047,385 $1,056,669 $1,050,603 2/17 $1,052,857 $1,064,007 $1,057,957 3/17 $1,057,190 $1,066,317 $1,060,336 4/17 $1,063,703 $1,074,054 $1,067,774 5/17 $1,079,852 $1,091,100 $1,085,405 6/17 $1,075,588 $1,087,187 $1,080,631 7/17 $1,082,120 $1,095,983 $1,088,812 8/17 $1,088,690 $1,104,323 $1,097,273 9/17 $1,084,363 $1,098,708 $1,089,432 10/17 $1,086,262 $1,101,390 $1,091,867 11/17 $1,080,963 $1,095,493 $1,086,203 12/17 $1,094,136 $1,106,943 $1,097,359 1/18 $1,078,753 $1,093,911 $1,082,880 2/18 $1,074,467 $1,090,642 $1,079,327 3/18 $1,081,267 $1,094,668 $1,084,276 4/18 $1,077,891 $1,090,761 $1,079,389 5/18 $1,088,213 $1,103,252 $1,091,415 6/18 $1,088,603 $1,104,193 $1,092,090 7/18 $1,090,243 $1,106,873 $1,094,310 8/18 $1,090,636 $1,109,715 $1,097,357 9/18 $1,085,955 $1,102,531 $1,089,193 10/18 $1,078,776 $1,095,742 $1,082,476 11/18 $1,089,354 $1,107,870 $1,095,966 12/18 $1,101,134 $1,121,135 $1,109,622 1/19 $1,107,840 $1,129,609 $1,117,186 2/19 $1,114,627 $1,135,658 $1,123,261 3/19 $1,130,326 $1,153,610 $1,140,342 4/19 $1,134,566 $1,157,945 $1,144,760 5/19 $1,148,977 $1,173,909 $1,159,275 6/19 $1,151,818 $1,178,244 $1,163,544 7/19 $1,161,002 $1,187,739 $1,172,730 8/19 $1,179,238 $1,206,474 $1,191,023 9/19 $1,169,447 $1,196,803 $1,181,863 10/19 $1,169,435 $1,198,948 $1,184,746 11/19 $1,169,499 $1,201,946 $1,187,025 12/19 $1,172,251 $1,205,616 $1,190,186 1/20 $1,194,692 $1,227,277 $1,211,391 2/20 $1,210,744 $1,243,103 $1,225,069 3/20 $1,170,069 $1,198,012 $1,193,037 4/20 $1,153,074 $1,182,977 $1,181,777 5/20 $1,186,228 $1,220,609 $1,220,708 6/20 $1,195,541 $1,230,655 $1,220,973 7/20 $1,213,997 $1,251,382 $1,241,037 8/20 $1,208,457 $1,245,511 $1,233,983 9/20 $1,208,173 $1,245,775 $1,234,785 10/20 $1,205,211 $1,242,033 $1,231,177 11/20 $1,221,042 $1,260,776 $1,247,879 12/20 $1,226,087 $1,268,456 $1,253,108 1/21 $1,229,529 $1,276,540 $1,258,816 2/21 $1,211,368 $1,256,257 $1,236,696 3/21 $1,214,636 $1,264,005 $1,244,987 4/21 $1,223,389 $1,274,607 $1,255,090 5/21 $1,226,790 $1,278,410 $1,257,056 6/21 $1,230,273 $1,281,920 $1,259,510 7/21 $1,240,389 $1,292,552 $1,269,718 8/21 $1,235,494 $1,287,808 $1,265,448 9/21 $1,225,267 $1,278,514 $1,255,092 10/21 $1,223,207 $1,274,776 $1,251,702 11/21 $1,233,536 $1,285,628 $1,262,728 12/21 $1,232,975 $1,287,702 $1,264,856 1/22 $1,200,523 $1,252,454 $1,228,906 2/22 $1,194,355 $1,247,967 $1,225,035 3/22 $1,156,390 $1,207,512 $1,186,209 4/22 $1,117,131 $1,174,113 $1,152,772 5/22 $1,126,329 $1,191,554 $1,170,645 6/22 $1,109,288 $1,172,038 $1,152,825 7/22 $1,140,967 $1,203,006 $1,181,705 8/22 $1,111,549 $1,176,640 $1,157,815 9/22 $1,070,827 $1,131,480 $1,113,742 10/22 $1,063,768 $1,122,070 $1,105,590 11/22 $1,115,739 $1,174,553 $1,156,368 12/22 $1,114,356 $1,177,916 $1,158,599 1/23 $1,146,869 $1,211,751 $1,190,157 2/23 $1,120,184 $1,184,351 $1,163,667 3/23 $1,142,961 $1,210,629 $1,190,137 4/23 $1,143,081 $1,207,864 $1,186,183 5/23 $1,134,724 $1,197,397 $1,175,501 6/23 $1,142,098 $1,209,391 $1,184,083 7/23 $1,143,748 $1,214,176 $1,188,093 8/23 $1,133,920 $1,196,696 $1,171,218 9/23 $1,101,074 $1,161,622 $1,138,256 10/23 $1,082,615 $1,151,737 $1,129,871 11/23 $1,153,874 $1,224,851 $1,196,102 12/23 $1,180,335 $1,253,319 $1,223,607 1/24 $1,179,202 $1,246,918 $1,218,192 2/24 $1,178,164 $1,248,519 $1,219,266 3/24 $1,177,099 $1,248,480 $1,219,014 4/24 $1,164,371 $1,233,018 $1,202,978 5/24 $1,157,495 $1,229,401 $1,198,090 6/24 $1,178,719 $1,248,245 $1,215,403 7/24 $1,189,657 $1,259,622 $1,228,031 8/24 $1,196,146 $1,269,557 $1,239,172 9/24 $1,210,123 $1,282,104 $1,251,402 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class I 9.90% 0.69% 1.92% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg Massachusetts Municipal Bond Index 9.94% 1.15% 2.27% |
| AssetsNet | $ 166,484,049 |
| Holdings Count | Holding | 85 |
| Advisory Fees Paid, Amount | $ 571,899 |
| InvestmentCompanyPortfolioTurnover | 57% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $166,484,049 # of Portfolio Holdings 85 Portfolio Turnover Rate 57% Total Advisory Fees Paid $571,899 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 10.2% Water and Sewer 3.3% Housing 4.3% Special Tax Revenue 8.4% Transportation 10.9% Hospital 14.2% General Obligations 21.3% Education 27.4% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 3.3% B 0.8% BB 2.3% BBB 9.7% A 12.4% AA 49.8% AAA 21.7% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000013123 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance National Municipal Income Fund |
| Class Name | Class A |
| Trading Symbol | EANAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance National Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B169"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $75 0.71% |
| Expenses Paid, Amount | $ 75 |
| Expense Ratio, Percent | 0.71% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↑ An overweight position in bonds with 17 years or more remaining to maturity helped returns as longer-maturity bonds outperformed shorter-maturity bonds ↑ Security selections and an overweight position in 4% coupon bonds contributed to Index-relative returns as interest rates generally declined during the period ↑ Security selections and an overweight position in the health care sector — the best-performing sector within the Index during the period — contributed to Fund returns relative to the Index ↓ An out-of-Index position in variable-rate demand notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates generally declined during the period ↓ An underweight position in bonds with coupon rates below 4% ― excluding zero-coupon bonds ― detracted from Index-relative returns during the period ↓ Security selections in bonds with 22 years or more remaining to maturity detracted from Fund performance relative to the Index during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class A with Maximum Sales Charge Bloomberg Municipal Bond Index 9/14 $9,675 $10,000 10/14 $9,736 $10,069 11/14 $9,728 $10,086 12/14 $9,829 $10,137 1/15 $10,020 $10,317 2/15 $9,873 $10,210 3/15 $9,915 $10,240 4/15 $9,857 $10,186 5/15 $9,839 $10,158 6/15 $9,811 $10,148 7/15 $9,873 $10,222 8/15 $9,936 $10,242 9/15 $9,999 $10,316 10/15 $10,052 $10,357 11/15 $10,126 $10,398 12/15 $10,252 $10,472 1/16 $10,356 $10,596 2/16 $10,297 $10,613 3/16 $10,393 $10,647 4/16 $10,520 $10,725 5/16 $10,573 $10,754 6/16 $10,785 $10,925 7/16 $10,734 $10,932 8/16 $10,798 $10,947 9/16 $10,767 $10,892 10/16 $10,672 $10,778 11/16 $10,310 $10,376 12/16 $10,427 $10,497 1/17 $10,461 $10,567 2/17 $10,505 $10,640 3/17 $10,538 $10,663 4/17 $10,614 $10,741 5/17 $10,766 $10,911 6/17 $10,733 $10,872 7/17 $10,820 $10,960 8/17 $10,907 $11,043 9/17 $10,908 $10,987 10/17 $10,873 $11,014 11/17 $10,839 $10,955 12/17 $10,915 $11,069 1/18 $10,825 $10,939 2/18 $10,813 $10,906 3/18 $10,846 $10,947 4/18 $10,822 $10,908 5/18 $10,968 $11,033 6/18 $10,993 $11,042 7/18 $11,039 $11,069 8/18 $11,049 $11,097 9/18 $10,991 $11,025 10/18 $10,931 $10,957 11/18 $11,020 $11,079 12/18 $11,108 $11,211 1/19 $11,163 $11,296 2/19 $11,254 $11,357 3/19 $11,436 $11,536 4/19 $11,491 $11,579 5/19 $11,672 $11,739 6/19 $11,714 $11,782 7/19 $11,813 $11,877 8/19 $12,042 $12,065 9/19 $11,932 $11,968 10/19 $11,925 $11,989 11/19 $11,943 $12,019 12/19 $11,984 $12,056 1/20 $12,237 $12,273 2/20 $12,456 $12,431 3/20 $11,899 $11,980 4/20 $11,676 $11,830 5/20 $12,074 $12,206 6/20 $12,246 $12,307 7/20 $12,467 $12,514 8/20 $12,399 $12,455 9/20 $12,390 $12,458 10/20 $12,345 $12,420 11/20 $12,578 $12,608 12/20 $12,677 $12,685 1/21 $12,775 $12,765 2/21 $12,544 $12,563 3/21 $12,628 $12,640 4/21 $12,749 $12,746 5/21 $12,819 $12,784 6/21 $12,855 $12,819 7/21 $12,951 $12,926 8/21 $12,874 $12,878 9/21 $12,760 $12,785 10/21 $12,732 $12,748 11/21 $12,853 $12,856 12/21 $12,863 $12,877 1/22 $12,512 $12,525 2/22 $12,424 $12,480 3/22 $12,035 $12,075 4/22 $11,698 $11,741 5/22 $11,851 $11,916 6/22 $11,604 $11,720 7/22 $11,885 $12,030 8/22 $11,599 $11,766 9/22 $11,149 $11,315 10/22 $11,018 $11,221 11/22 $11,652 $11,746 12/22 $11,585 $11,779 1/23 $12,005 $12,118 2/23 $11,707 $11,844 3/23 $11,937 $12,106 4/23 $11,973 $12,079 5/23 $11,892 $11,974 6/23 $12,019 $12,094 7/23 $12,055 $12,142 8/23 $11,895 $11,967 9/23 $11,526 $11,616 10/23 $11,301 $11,517 11/23 $12,133 $12,249 12/23 $12,477 $12,533 1/24 $12,489 $12,469 2/24 $12,488 $12,485 3/24 $12,486 $12,485 4/24 $12,338 $12,330 5/24 $12,377 $12,294 6/24 $12,566 $12,482 7/24 $12,660 $12,596 8/24 $12,726 $12,696 9/24 $12,891 $12,821 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class A 11.82% 1.55% 2.91% Class A with 3.25% Maximum Sales Charge 8.24% 0.89% 2.57% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% |
| AssetsNet | $ 4,618,197,661 |
| Holdings Count | Holding | 548 |
| Advisory Fees Paid, Amount | $ 13,359,012 |
| InvestmentCompanyPortfolioTurnover | 82% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $4,618,197,661 # of Portfolio Holdings 548 Portfolio Turnover Rate 82% Total Advisory Fees Paid $13,359,012 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 7.7% Other Revenue 3.3% Housing 3.8% Electric Utilities 5.3% Education 5.7% Water and Sewer 8.0% Special Tax Revenue 9.7% Hospital 12.8% General Obligations 21.1% Transportation 22.6% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 4.1% BB 2.0% BBB 6.1% A 19.0% AA 50.0% AAA 18.8% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000013125 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance National Municipal Income Fund |
| Class Name | Class C |
| Trading Symbol | ECHMX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance National Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B194"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $154 1.46% |
| Expenses Paid, Amount | $ 154 |
| Expense Ratio, Percent | 1.46% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↑ An overweight position in bonds with 17 years or more remaining to maturity helped returns as longer-maturity bonds outperformed shorter-maturity bonds ↑ Security selections and an overweight position in 4% coupon bonds contributed to Index-relative returns as interest rates generally declined during the period ↑ Security selections and an overweight position in the health care sector — the best-performing sector within the Index during the period — contributed to Fund returns relative to the Index ↓ An out-of-Index position in variable-rate demand notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates generally declined during the period ↓ An underweight position in bonds with coupon rates below 4% ― excluding zero-coupon bonds ― detracted from Index-relative returns during the period ↓ Security selections in bonds with 22 years or more remaining to maturity detracted from Fund performance relative to the Index during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class C Bloomberg Municipal Bond Index 9/14 $10,000 $10,000 10/14 $10,057 $10,069 11/14 $10,042 $10,086 12/14 $10,140 $10,137 1/15 $10,330 $10,317 2/15 $10,173 $10,210 3/15 $10,210 $10,240 4/15 $10,144 $10,186 5/15 $10,119 $10,158 6/15 $10,073 $10,148 7/15 $10,142 $10,222 8/15 $10,199 $10,242 9/15 $10,258 $10,316 10/15 $10,305 $10,357 11/15 $10,375 $10,398 12/15 $10,497 $10,472 1/16 $10,598 $10,596 2/16 $10,531 $10,613 3/16 $10,622 $10,647 4/16 $10,745 $10,725 5/16 $10,793 $10,754 6/16 $11,003 $10,925 7/16 $10,944 $10,932 8/16 $11,002 $10,947 9/16 $10,963 $10,892 10/16 $10,859 $10,778 11/16 $10,485 $10,376 12/16 $10,598 $10,497 1/17 $10,625 $10,567 2/17 $10,663 $10,640 3/17 $10,690 $10,663 4/17 $10,761 $10,741 5/17 $10,908 $10,911 6/17 $10,868 $10,872 7/17 $10,949 $10,960 8/17 $11,031 $11,043 9/17 $11,024 $10,987 10/17 $10,982 $11,014 11/17 $10,941 $10,955 12/17 $11,010 $11,069 1/18 $10,913 $10,939 2/18 $10,895 $10,906 3/18 $10,920 $10,947 4/18 $10,890 $10,908 5/18 $11,030 $11,033 6/18 $11,048 $11,042 7/18 $11,088 $11,069 8/18 $11,090 $11,097 9/18 $11,025 $11,025 10/18 $10,958 $10,957 11/18 $11,040 $11,079 12/18 $11,122 $11,211 1/19 $11,170 $11,296 2/19 $11,254 $11,357 3/19 $11,430 $11,536 4/19 $11,477 $11,579 5/19 $11,651 $11,739 6/19 $11,685 $11,782 7/19 $11,777 $11,877 8/19 $11,998 $12,065 9/19 $11,881 $11,968 10/19 $11,867 $11,989 11/19 $11,878 $12,019 12/19 $11,911 $12,056 1/20 $12,155 $12,273 2/20 $12,365 $12,431 3/20 $11,805 $11,980 4/20 $11,576 $11,830 5/20 $11,964 $12,206 6/20 $12,127 $12,307 7/20 $12,338 $12,514 8/20 $12,263 $12,455 9/20 $12,247 $12,458 10/20 $12,194 $12,420 11/20 $12,417 $12,608 12/20 $12,507 $12,685 1/21 $12,596 $12,765 2/21 $12,361 $12,563 3/21 $12,435 $12,640 4/21 $12,546 $12,746 5/21 $12,608 $12,784 6/21 $12,635 $12,819 7/21 $12,721 $12,926 8/21 $12,637 $12,878 9/21 $12,518 $12,785 10/21 $12,482 $12,748 11/21 $12,581 $12,856 12/21 $12,595 $12,877 1/22 $12,243 $12,525 2/22 $12,150 $12,480 3/22 $11,762 $12,075 4/22 $11,426 $11,741 5/22 $11,568 $11,916 6/22 $11,321 $11,720 7/22 $11,587 $12,030 8/22 $11,301 $11,766 9/22 $10,856 $11,315 10/22 $10,721 $11,221 11/22 $11,331 $11,746 12/22 $11,259 $11,779 1/23 $11,659 $12,118 2/23 $11,364 $11,844 3/23 $11,579 $12,106 4/23 $11,607 $12,079 5/23 $11,521 $11,974 6/23 $11,637 $12,094 7/23 $11,665 $12,142 8/23 $11,503 $11,967 9/23 $11,139 $11,616 10/23 $10,914 $11,517 11/23 $11,711 $12,249 12/23 $12,035 $12,533 1/24 $12,039 $12,469 2/24 $12,031 $12,485 3/24 $12,022 $12,485 4/24 $11,871 $12,330 5/24 $11,901 $12,294 6/24 $12,076 $12,482 7/24 $12,158 $12,596 8/24 $12,214 $12,696 9/24 $12,550 $12,821 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class C 10.99% 0.80% 2.30% Class C with 1% Maximum Deferred Sales Charge 9.99% 0.80% 2.30% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% |
| AssetsNet | $ 4,618,197,661 |
| Holdings Count | Holding | 548 |
| Advisory Fees Paid, Amount | $ 13,359,012 |
| InvestmentCompanyPortfolioTurnover | 82% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $4,618,197,661 # of Portfolio Holdings 548 Portfolio Turnover Rate 82% Total Advisory Fees Paid $13,359,012 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 7.7% Other Revenue 3.3% Housing 3.8% Electric Utilities 5.3% Education 5.7% Water and Sewer 8.0% Special Tax Revenue 9.7% Hospital 12.8% General Obligations 21.1% Transportation 22.6% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 4.1% BB 2.0% BBB 6.1% A 19.0% AA 50.0% AAA 18.8% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000013126 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance National Municipal Income Fund |
| Class Name | Class I |
| Trading Symbol | EIHMX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance National Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B219"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $49 0.46% |
| Expenses Paid, Amount | $ 49 |
| Expense Ratio, Percent | 0.46% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↑ An overweight position in bonds with 17 years or more remaining to maturity helped returns as longer-maturity bonds outperformed shorter-maturity bonds ↑ Security selections and an overweight position in 4% coupon bonds contributed to Index-relative returns as interest rates generally declined during the period ↑ Security selections and an overweight position in the health care sector — the best-performing sector within the Index during the period — contributed to Fund returns relative to the Index ↓ An out-of-Index position in variable-rate demand notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates generally declined during the period ↓ An underweight position in bonds with coupon rates below 4% ― excluding zero-coupon bonds ― detracted from Index-relative returns during the period ↓ Security selections in bonds with 22 years or more remaining to maturity detracted from Fund performance relative to the Index during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class I Bloomberg Municipal Bond Index 9/14 $1,000,000 $1,000,000 10/14 $1,005,503 $1,006,857 11/14 $1,004,890 $1,008,598 12/14 $1,015,498 $1,013,687 1/15 $1,035,468 $1,031,654 2/15 $1,020,453 $1,021,012 3/15 $1,025,034 $1,023,960 4/15 $1,019,257 $1,018,588 5/15 $1,017,607 $1,015,774 6/15 $1,014,900 $1,014,848 7/15 $1,021,579 $1,022,199 8/15 $1,028,228 $1,024,207 9/15 $1,034,978 $1,031,626 10/15 $1,040,681 $1,035,727 11/15 $1,048,558 $1,039,845 12/15 $1,061,805 $1,047,151 1/16 $1,072,893 $1,059,645 2/16 $1,066,957 $1,061,312 3/16 $1,077,114 $1,064,674 4/16 $1,090,460 $1,072,502 5/16 $1,096,259 $1,075,403 6/16 $1,118,468 $1,092,511 7/16 $1,113,412 $1,093,178 8/16 $1,120,238 $1,094,653 9/16 $1,117,225 $1,089,190 10/16 $1,107,609 $1,077,763 11/16 $1,070,332 $1,037,568 12/16 $1,082,732 $1,049,749 1/17 $1,086,398 $1,056,669 2/17 $1,091,194 $1,064,007 3/17 $1,094,871 $1,066,317 4/17 $1,102,982 $1,074,054 5/17 $1,118,985 $1,091,100 6/17 $1,115,809 $1,087,187 7/17 $1,125,117 $1,095,983 8/17 $1,134,445 $1,104,323 9/17 $1,134,694 $1,098,708 10/17 $1,131,377 $1,101,390 11/17 $1,128,028 $1,095,493 12/17 $1,136,141 $1,106,943 1/18 $1,127,040 $1,093,911 2/18 $1,126,047 $1,090,642 3/18 $1,129,665 $1,094,668 4/18 $1,127,420 $1,090,761 5/18 $1,142,907 $1,103,252 6/18 $1,145,730 $1,104,193 7/18 $1,150,801 $1,106,873 8/18 $1,151,988 $1,109,715 9/18 $1,146,175 $1,102,531 10/18 $1,140,184 $1,095,742 11/18 $1,149,692 $1,107,870 12/18 $1,159,202 $1,121,135 1/19 $1,165,176 $1,129,609 2/19 $1,174,852 $1,135,658 3/19 $1,194,146 $1,153,610 4/19 $1,200,072 $1,157,945 5/19 $1,219,234 $1,173,909 6/19 $1,223,834 $1,178,244 7/19 $1,234,465 $1,187,739 8/19 $1,258,645 $1,206,474 9/19 $1,247,308 $1,196,803 10/19 $1,246,829 $1,198,948 11/19 $1,248,959 $1,201,946 12/19 $1,253,480 $1,205,616 1/20 $1,280,226 $1,227,277 2/20 $1,303,362 $1,243,103 3/20 $1,245,356 $1,198,012 4/20 $1,222,262 $1,182,977 5/20 $1,264,246 $1,220,609 6/20 $1,282,521 $1,230,655 7/20 $1,305,906 $1,251,382 8/20 $1,299,052 $1,245,511 9/20 $1,298,384 $1,245,775 10/20 $1,293,906 $1,242,033 11/20 $1,318,649 $1,260,776 12/20 $1,329,281 $1,268,456 1/21 $1,339,845 $1,276,540 2/21 $1,315,886 $1,256,257 3/21 $1,324,945 $1,264,005 4/21 $1,337,866 $1,274,607 5/21 $1,345,551 $1,278,410 6/21 $1,349,591 $1,281,920 7/21 $1,359,934 $1,292,552 8/21 $1,352,139 $1,287,808 9/21 $1,340,459 $1,278,514 10/21 $1,337,810 $1,274,776 11/21 $1,349,511 $1,285,628 12/21 $1,352,123 $1,287,702 1/22 $1,315,493 $1,252,454 2/22 $1,306,488 $1,247,967 3/22 $1,265,880 $1,207,512 4/22 $1,230,746 $1,174,113 5/22 $1,247,080 $1,191,554 6/22 $1,221,371 $1,172,038 7/22 $1,251,212 $1,203,006 8/22 $1,221,347 $1,176,640 9/22 $1,174,230 $1,131,480 10/22 $1,160,617 $1,122,070 11/22 $1,227,632 $1,174,553 12/22 $1,220,866 $1,177,916 1/23 $1,265,379 $1,211,751 2/23 $1,234,259 $1,184,351 3/23 $1,258,679 $1,210,629 4/23 $1,261,383 $1,207,864 5/23 $1,254,498 $1,197,397 6/23 $1,268,176 $1,209,391 7/23 $1,272,235 $1,214,176 8/23 $1,255,653 $1,196,696 9/23 $1,216,921 $1,161,622 10/23 $1,192,014 $1,151,737 11/23 $1,281,513 $1,224,851 12/23 $1,318,126 $1,253,319 1/24 $1,319,660 $1,246,918 2/24 $1,319,846 $1,248,519 3/24 $1,319,952 $1,248,480 4/24 $1,304,493 $1,233,018 5/24 $1,308,914 $1,229,401 6/24 $1,329,161 $1,248,245 7/24 $1,339,376 $1,259,622 8/24 $1,346,695 $1,269,557 9/24 $1,364,260 $1,282,104 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class I 12.10% 1.81% 3.15% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% |
| AssetsNet | $ 4,618,197,661 |
| Holdings Count | Holding | 548 |
| Advisory Fees Paid, Amount | $ 13,359,012 |
| InvestmentCompanyPortfolioTurnover | 82% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $4,618,197,661 # of Portfolio Holdings 548 Portfolio Turnover Rate 82% Total Advisory Fees Paid $13,359,012 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 7.7% Other Revenue 3.3% Housing 3.8% Electric Utilities 5.3% Education 5.7% Water and Sewer 8.0% Special Tax Revenue 9.7% Hospital 12.8% General Obligations 21.1% Transportation 22.6% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 4.1% BB 2.0% BBB 6.1% A 19.0% AA 50.0% AAA 18.8% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000013130 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance New York Municipal Income Fund |
| Class Name | Class A |
| Trading Symbol | ETNYX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance New York Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B244"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $95 0.89% |
| Expenses Paid, Amount | $ 95 |
| Expense Ratio, Percent | 0.89% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↑ An overweight position in bonds rated BBB and below helped returns as lower-credit-quality bonds generally outperformed higher-credit-quality bonds ↑ An overweight position in bonds with 22 years or more remaining to maturity contributed to returns relative to the Index as longer-maturity bonds outperformed shorter-maturity bonds during the period ↑ Security selections and an overweight position in 4% coupon bonds, which typically have longer durations than higher-coupon bonds, contributed to returns relative to the Index as interest rates declined during the period ↓ An underweight position in the health care sector ― the best-performing sector within the Index during the period ― detracted from Index-relative returns ↓ An out-of-Index position in variable-rate demand notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates declined during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class A with Maximum Sales Charge Bloomberg Municipal Bond Index Bloomberg New York Municipal Bond Index 9/14 $9,675 $10,000 $10,000 10/14 $9,715 $10,069 $10,068 11/14 $9,706 $10,086 $10,079 12/14 $9,784 $10,137 $10,121 1/15 $9,958 $10,317 $10,303 2/15 $9,853 $10,210 $10,191 3/15 $9,883 $10,240 $10,224 4/15 $9,844 $10,186 $10,172 5/15 $9,815 $10,158 $10,163 6/15 $9,814 $10,148 $10,159 7/15 $9,872 $10,222 $10,237 8/15 $9,901 $10,242 $10,264 9/15 $9,959 $10,316 $10,329 10/15 $10,008 $10,357 $10,367 11/15 $10,057 $10,398 $10,405 12/15 $10,165 $10,472 $10,469 1/16 $10,293 $10,596 $10,602 2/16 $10,270 $10,613 $10,617 3/16 $10,337 $10,647 $10,643 4/16 $10,424 $10,725 $10,728 5/16 $10,471 $10,754 $10,755 6/16 $10,680 $10,925 $10,911 7/16 $10,645 $10,932 $10,925 8/16 $10,671 $10,947 $10,937 9/16 $10,605 $10,892 $10,881 10/16 $10,497 $10,778 $10,764 11/16 $10,074 $10,376 $10,384 12/16 $10,203 $10,497 $10,510 1/17 $10,230 $10,567 $10,574 2/17 $10,291 $10,640 $10,640 3/17 $10,317 $10,663 $10,665 4/17 $10,385 $10,741 $10,742 5/17 $10,557 $10,911 $10,915 6/17 $10,520 $10,872 $10,876 7/17 $10,588 $10,960 $10,962 8/17 $10,656 $11,043 $11,034 9/17 $10,640 $10,987 $10,971 10/17 $10,655 $11,014 $10,998 11/17 $10,596 $10,955 $10,935 12/17 $10,716 $11,069 $11,044 1/18 $10,593 $10,939 $10,914 2/18 $10,544 $10,906 $10,880 3/18 $10,579 $10,947 $10,912 4/18 $10,540 $10,908 $10,867 5/18 $10,640 $11,033 $10,989 6/18 $10,644 $11,042 $10,995 7/18 $10,670 $11,069 $11,016 8/18 $10,673 $11,097 $11,037 9/18 $10,613 $11,025 $10,970 10/18 $10,541 $10,957 $10,901 11/18 $10,643 $11,079 $11,029 12/18 $10,755 $11,211 $11,159 1/19 $10,824 $11,296 $11,242 2/19 $10,905 $11,357 $11,303 3/19 $11,083 $11,536 $11,479 4/19 $11,152 $11,579 $11,518 5/19 $11,308 $11,739 $11,677 6/19 $11,343 $11,782 $11,713 7/19 $11,442 $11,877 $11,806 8/19 $11,652 $12,065 $11,975 9/19 $11,540 $11,968 $11,877 10/19 $11,516 $11,989 $11,892 11/19 $11,527 $12,019 $11,921 12/19 $11,572 $12,056 $11,954 1/20 $11,817 $12,273 $12,164 2/20 $12,042 $12,431 $12,311 3/20 $11,581 $11,980 $11,857 4/20 $11,300 $11,830 $11,653 5/20 $11,705 $12,206 $12,029 6/20 $11,817 $12,307 $12,135 7/20 $12,030 $12,514 $12,313 8/20 $11,937 $12,455 $12,221 9/20 $11,899 $12,458 $12,199 10/20 $11,871 $12,420 $12,159 11/20 $12,116 $12,608 $12,394 12/20 $12,212 $12,685 $12,499 1/21 $12,322 $12,765 $12,585 2/21 $12,070 $12,563 $12,372 3/21 $12,154 $12,640 $12,450 4/21 $12,286 $12,746 $12,585 5/21 $12,348 $12,784 $12,643 6/21 $12,398 $12,819 $12,685 7/21 $12,496 $12,926 $12,785 8/21 $12,417 $12,878 $12,719 9/21 $12,291 $12,785 $12,616 10/21 $12,260 $12,748 $12,587 11/21 $12,371 $12,856 $12,707 12/21 $12,392 $12,877 $12,733 1/22 $12,014 $12,525 $12,372 2/22 $11,925 $12,480 $12,326 3/22 $11,499 $12,075 $11,901 4/22 $11,133 $11,741 $11,554 5/22 $11,308 $11,916 $11,786 6/22 $11,076 $11,720 $11,534 7/22 $11,400 $12,030 $11,852 8/22 $11,107 $11,766 $11,557 9/22 $10,682 $11,315 $11,108 10/22 $10,572 $11,221 $11,004 11/22 $11,158 $11,746 $11,569 12/22 $11,123 $11,779 $11,595 1/23 $11,517 $12,118 $11,974 2/23 $11,227 $11,844 $11,686 3/23 $11,476 $12,106 $11,968 4/23 $11,492 $12,079 $11,950 5/23 $11,409 $11,974 $11,843 6/23 $11,524 $12,094 $11,987 7/23 $11,554 $12,142 $12,019 8/23 $11,372 $11,967 $11,827 9/23 $10,978 $11,616 $11,454 10/23 $10,759 $11,517 $11,357 11/23 $11,683 $12,249 $12,144 12/23 $12,031 $12,533 $12,443 1/24 $12,013 $12,469 $12,371 2/24 $11,983 $12,485 $12,371 3/24 $11,965 $12,485 $12,352 4/24 $11,834 $12,330 $12,202 5/24 $11,842 $12,294 $12,168 6/24 $12,056 $12,482 $12,380 7/24 $12,143 $12,596 $12,486 8/24 $12,217 $12,696 $12,574 9/24 $12,359 $12,821 $12,700 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class A 12.57% 1.38% 2.48% Class A with 3.25% Maximum Sales Charge 8.96% 0.71% 2.14% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg New York Municipal Bond Index 10.88% 1.35% 2.42% |
| AssetsNet | $ 362,823,791 |
| Holdings Count | Holding | 139 |
| Advisory Fees Paid, Amount | $ 1,420,337 |
| InvestmentCompanyPortfolioTurnover | 67% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $362,823,791 # of Portfolio Holdings 139 Portfolio Turnover Rate 67% Total Advisory Fees Paid $1,420,337 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 10.6% Housing 3.8% Industrial Development Revenue 3.9% Hospital 4.0% Electric Utilities 6.9% General Obligations 7.7% Education 8.0% Water and Sewer 8.4% Transportation 18.9% Special Tax Revenue 27.8% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 6.4% B 1.2% BB 1.0% BBB 13.0% A 6.7% AA 54.8% AAA 16.9% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000013132 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance New York Municipal Income Fund |
| Class Name | Class C |
| Trading Symbol | ECNYX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance New York Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B269"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $175 1.65% |
| Expenses Paid, Amount | $ 175 |
| Expense Ratio, Percent | 1.65% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↑ An overweight position in bonds rated BBB and below helped returns as lower-credit-quality bonds generally outperformed higher-credit-quality bonds ↑ An overweight position in bonds with 22 years or more remaining to maturity contributed to returns relative to the Index as longer-maturity bonds outperformed shorter-maturity bonds during the period ↑ Security selections and an overweight position in 4% coupon bonds, which typically have longer durations than higher-coupon bonds, contributed to returns relative to the Index as interest rates declined during the period ↓ An underweight position in the health care sector ― the best-performing sector within the Index during the period ― detracted from Index-relative returns ↓ An out-of-Index position in variable-rate demand notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates declined during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class C Bloomberg Municipal Bond Index Bloomberg New York Municipal Bond Index 9/14 $10,000 $10,000 $10,000 10/14 $10,044 $10,069 $10,068 11/14 $10,030 $10,086 $10,079 12/14 $10,093 $10,137 $10,121 1/15 $10,267 $10,317 $10,303 2/15 $10,162 $10,210 $10,191 3/15 $10,187 $10,240 $10,224 4/15 $10,131 $10,186 $10,172 5/15 $10,104 $10,158 $10,163 6/15 $10,087 $10,148 $10,159 7/15 $10,141 $10,222 $10,237 8/15 $10,173 $10,242 $10,264 9/15 $10,217 $10,316 $10,329 10/15 $10,260 $10,357 $10,367 11/15 $10,305 $10,398 $10,405 12/15 $10,419 $10,472 $10,469 1/16 $10,533 $10,596 $10,602 2/16 $10,503 $10,613 $10,617 3/16 $10,565 $10,647 $10,643 4/16 $10,658 $10,725 $10,728 5/16 $10,699 $10,754 $10,755 6/16 $10,895 $10,925 $10,911 7/16 $10,853 $10,932 $10,925 8/16 $10,883 $10,947 $10,937 9/16 $10,798 $10,892 $10,881 10/16 $10,682 $10,778 $10,764 11/16 $10,255 $10,376 $10,384 12/16 $10,380 $10,497 $10,510 1/17 $10,390 $10,567 $10,574 2/17 $10,446 $10,640 $10,640 3/17 $10,477 $10,663 $10,665 4/17 $10,539 $10,741 $10,742 5/17 $10,696 $10,911 $10,915 6/17 $10,663 $10,872 $10,876 7/17 $10,714 $10,960 $10,962 8/17 $10,776 $11,043 $11,034 9/17 $10,764 $10,987 $10,971 10/17 $10,762 $11,014 $10,998 11/17 $10,696 $10,955 $10,935 12/17 $10,810 $11,069 $11,044 1/18 $10,679 $10,939 $10,914 2/18 $10,623 $10,906 $10,880 3/18 $10,652 $10,947 $10,912 4/18 $10,606 $10,908 $10,867 5/18 $10,711 $11,033 $10,989 6/18 $10,708 $11,042 $10,995 7/18 $10,716 $11,069 $11,016 8/18 $10,724 $11,097 $11,037 9/18 $10,646 $11,025 $10,970 10/18 $10,567 $10,957 $10,901 11/18 $10,663 $11,079 $11,029 12/18 $10,769 $11,211 $11,159 1/19 $10,842 $11,296 $11,242 2/19 $10,905 $11,357 $11,303 3/19 $11,088 $11,536 $11,479 4/19 $11,138 $11,579 $11,518 5/19 $11,298 $11,739 $11,677 6/19 $11,314 $11,782 $11,713 7/19 $11,406 $11,877 $11,806 8/19 $11,608 $12,065 $11,975 9/19 $11,501 $11,968 $11,877 10/19 $11,459 $11,989 $11,892 11/19 $11,474 $12,019 $11,921 12/19 $11,500 $12,056 $11,954 1/20 $11,736 $12,273 $12,164 2/20 $11,952 $12,431 $12,311 3/20 $11,499 $11,980 $11,857 4/20 $11,202 $11,830 $11,653 5/20 $11,596 $12,206 $12,029 6/20 $11,712 $12,307 $12,135 7/20 $11,904 $12,514 $12,313 8/20 $11,816 $12,455 $12,221 9/20 $11,760 $12,458 $12,199 10/20 $11,724 $12,420 $12,159 11/20 $11,971 $12,608 $12,394 12/20 $12,047 $12,685 $12,499 1/21 $12,147 $12,765 $12,585 2/21 $11,903 $12,563 $12,372 3/21 $11,968 $12,640 $12,450 4/21 $12,090 $12,746 $12,585 5/21 $12,154 $12,784 $12,643 6/21 $12,197 $12,819 $12,685 7/21 $12,273 $12,926 $12,785 8/21 $12,187 $12,878 $12,719 9/21 $12,056 $12,785 $12,616 10/21 $12,018 $12,748 $12,587 11/21 $12,132 $12,856 $12,707 12/21 $12,144 $12,877 $12,733 1/22 $11,755 $12,525 $12,372 2/22 $11,673 $12,480 $12,326 3/22 $11,237 $12,075 $11,901 4/22 $10,884 $11,741 $11,554 5/22 $11,049 $11,916 $11,786 6/22 $10,816 $11,720 $11,534 7/22 $11,113 $12,030 $11,852 8/22 $10,821 $11,766 $11,557 9/22 $10,411 $11,315 $11,108 10/22 $10,286 $11,221 $11,004 11/22 $10,861 $11,746 $11,569 12/22 $10,821 $11,779 $11,595 1/23 $11,196 $12,118 $11,974 2/23 $10,908 $11,844 $11,686 3/23 $11,131 $12,106 $11,968 4/23 $11,139 $12,079 $11,950 5/23 $11,052 $11,974 $11,843 6/23 $11,169 $12,094 $11,987 7/23 $11,190 $12,142 $12,019 8/23 $10,995 $11,967 $11,827 9/23 $10,608 $11,616 $11,454 10/23 $10,401 $11,517 $11,357 11/23 $11,275 $12,249 $12,144 12/23 $11,603 $12,533 $12,443 1/24 $11,579 $12,469 $12,371 2/24 $11,543 $12,485 $12,371 3/24 $11,519 $12,485 $12,352 4/24 $11,397 $12,330 $12,202 5/24 $11,398 $12,294 $12,168 6/24 $11,584 $12,482 $12,380 7/24 $11,673 $12,596 $12,486 8/24 $11,737 $12,696 $12,574 9/24 $12,045 $12,821 $12,700 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class C 11.84% 0.62% 1.88% Class C with 1% Maximum Deferred Sales Charge 10.84% 0.62% 1.88% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg New York Municipal Bond Index 10.88% 1.35% 2.42% |
| AssetsNet | $ 362,823,791 |
| Holdings Count | Holding | 139 |
| Advisory Fees Paid, Amount | $ 1,420,337 |
| InvestmentCompanyPortfolioTurnover | 67% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $362,823,791 # of Portfolio Holdings 139 Portfolio Turnover Rate 67% Total Advisory Fees Paid $1,420,337 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 10.6% Housing 3.8% Industrial Development Revenue 3.9% Hospital 4.0% Electric Utilities 6.9% General Obligations 7.7% Education 8.0% Water and Sewer 8.4% Transportation 18.9% Special Tax Revenue 27.8% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 6.4% B 1.2% BB 1.0% BBB 13.0% A 6.7% AA 54.8% AAA 16.9% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000063949 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance New York Municipal Income Fund |
| Class Name | Class I |
| Trading Symbol | EINYX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance New York Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B294"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $73 0.69% |
| Expenses Paid, Amount | $ 73 |
| Expense Ratio, Percent | 0.69% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↑ An overweight position in bonds rated BBB and below helped returns as lower-credit-quality bonds generally outperformed higher-credit-quality bonds ↑ An overweight position in bonds with 22 years or more remaining to maturity contributed to returns relative to the Index as longer-maturity bonds outperformed shorter-maturity bonds during the period ↑ Security selections and an overweight position in 4% coupon bonds, which typically have longer durations than higher-coupon bonds, contributed to returns relative to the Index as interest rates declined during the period ↓ An underweight position in the health care sector ― the best-performing sector within the Index during the period ― detracted from Index-relative returns ↓ An out-of-Index position in variable-rate demand notes — typically considered defensive investments with virtually zero duration — detracted from returns relative to the Index as interest rates declined during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class I Bloomberg Municipal Bond Index Bloomberg New York Municipal Bond Index 9/14 $1,000,000 $1,000,000 $1,000,000 10/14 $1,004,261 $1,006,857 $1,006,815 11/14 $1,003,551 $1,008,598 $1,007,893 12/14 $1,011,757 $1,013,687 $1,012,127 1/15 $1,029,936 $1,031,654 $1,030,287 2/15 $1,019,237 $1,021,012 $1,019,086 3/15 $1,022,498 $1,023,960 $1,022,422 4/15 $1,017,649 $1,018,588 $1,017,245 5/15 $1,015,794 $1,015,774 $1,016,278 6/15 $1,014,920 $1,014,848 $1,015,935 7/15 $1,022,118 $1,022,199 $1,023,705 8/15 $1,025,221 $1,024,207 $1,026,358 9/15 $1,031,417 $1,031,626 $1,032,883 10/15 $1,035,624 $1,035,727 $1,036,675 11/15 $1,041,959 $1,039,845 $1,040,494 12/15 $1,053,326 $1,047,151 $1,046,928 1/16 $1,066,725 $1,059,645 $1,060,151 2/16 $1,064,527 $1,061,312 $1,061,749 3/16 $1,071,659 $1,064,674 $1,064,335 4/16 $1,080,859 $1,072,502 $1,072,820 5/16 $1,085,874 $1,075,403 $1,075,456 6/16 $1,106,664 $1,092,511 $1,091,145 7/16 $1,104,323 $1,093,178 $1,092,498 8/16 $1,107,195 $1,094,653 $1,093,687 9/16 $1,100,496 $1,089,190 $1,088,129 10/16 $1,089,522 $1,077,763 $1,076,424 11/16 $1,045,784 $1,037,568 $1,038,431 12/16 $1,059,349 $1,049,749 $1,050,960 1/17 $1,062,329 $1,056,669 $1,057,355 2/17 $1,068,834 $1,064,007 $1,063,996 3/17 $1,071,732 $1,066,317 $1,066,531 4/17 $1,078,958 $1,074,054 $1,074,222 5/17 $1,096,985 $1,091,100 $1,091,487 6/17 $1,093,396 $1,087,187 $1,087,648 7/17 $1,100,637 $1,095,983 $1,096,173 8/17 $1,107,874 $1,104,323 $1,103,424 9/17 $1,106,385 $1,098,708 $1,097,124 10/17 $1,108,163 $1,101,390 $1,099,770 11/17 $1,102,207 $1,095,493 $1,093,516 12/17 $1,114,888 $1,106,943 $1,104,444 1/18 $1,102,207 $1,093,911 $1,091,444 2/18 $1,097,284 $1,090,642 $1,087,997 3/18 $1,101,175 $1,094,668 $1,091,189 4/18 $1,097,272 $1,090,761 $1,086,656 5/18 $1,107,880 $1,103,252 $1,098,928 6/18 $1,108,471 $1,104,193 $1,099,540 7/18 $1,111,324 $1,106,873 $1,101,594 8/18 $1,111,899 $1,109,715 $1,103,724 9/18 $1,105,755 $1,102,531 $1,097,003 10/18 $1,097,327 $1,095,742 $1,090,089 11/18 $1,109,245 $1,107,870 $1,102,872 12/18 $1,121,179 $1,121,135 $1,115,945 1/19 $1,128,548 $1,129,609 $1,124,203 2/19 $1,136,023 $1,135,658 $1,130,316 3/19 $1,155,945 $1,153,610 $1,147,859 4/19 $1,162,119 $1,157,945 $1,151,819 5/19 $1,179,713 $1,173,909 $1,167,699 6/19 $1,183,527 $1,178,244 $1,171,316 7/19 $1,194,097 $1,187,739 $1,180,573 8/19 $1,216,188 $1,206,474 $1,197,510 9/19 $1,204,749 $1,196,803 $1,187,724 10/19 $1,201,309 $1,198,948 $1,189,150 11/19 $1,203,798 $1,201,946 $1,192,131 12/19 $1,208,640 $1,205,616 $1,195,367 1/20 $1,234,490 $1,227,277 $1,216,358 2/20 $1,256,953 $1,243,103 $1,231,106 3/20 $1,210,211 $1,198,012 $1,185,683 4/20 $1,181,032 $1,182,977 $1,165,275 5/20 $1,223,529 $1,220,609 $1,202,853 6/20 $1,235,461 $1,230,655 $1,213,495 7/20 $1,256,714 $1,251,382 $1,231,318 8/20 $1,248,371 $1,245,511 $1,222,067 9/20 $1,244,555 $1,245,775 $1,219,913 10/20 $1,240,635 $1,242,033 $1,215,869 11/20 $1,267,691 $1,260,776 $1,239,442 12/20 $1,278,014 $1,268,456 $1,249,904 1/21 $1,288,433 $1,276,540 $1,258,524 2/21 $1,263,466 $1,256,257 $1,237,232 3/21 $1,272,562 $1,264,005 $1,245,038 4/21 $1,285,357 $1,274,607 $1,258,468 5/21 $1,293,251 $1,278,410 $1,264,306 6/21 $1,298,770 $1,281,920 $1,268,465 7/21 $1,307,948 $1,292,552 $1,278,464 8/21 $1,299,875 $1,287,808 $1,271,851 9/21 $1,286,935 $1,278,514 $1,261,635 10/21 $1,285,122 $1,274,776 $1,258,682 11/21 $1,297,029 $1,285,628 $1,270,680 12/21 $1,299,379 $1,287,702 $1,273,252 1/22 $1,259,951 $1,252,454 $1,237,249 2/22 $1,250,836 $1,247,967 $1,232,583 3/22 $1,205,072 $1,207,512 $1,190,050 4/22 $1,168,129 $1,174,113 $1,155,397 5/22 $1,186,755 $1,191,554 $1,178,599 6/22 $1,162,602 $1,172,038 $1,153,419 7/22 $1,196,772 $1,203,006 $1,185,161 8/22 $1,166,269 $1,176,640 $1,155,670 9/22 $1,121,782 $1,131,480 $1,110,801 10/22 $1,110,442 $1,122,070 $1,100,387 11/22 $1,172,150 $1,174,553 $1,156,876 12/22 $1,168,716 $1,177,916 $1,159,484 1/23 $1,210,333 $1,211,751 $1,197,429 2/23 $1,179,956 $1,184,351 $1,168,585 3/23 $1,206,337 $1,210,629 $1,196,778 4/23 $1,208,207 $1,207,864 $1,194,953 5/23 $1,199,686 $1,197,397 $1,184,323 6/23 $1,212,054 $1,209,391 $1,198,736 7/23 $1,215,325 $1,214,176 $1,201,854 8/23 $1,195,096 $1,196,696 $1,182,678 9/23 $1,155,175 $1,161,622 $1,145,389 10/23 $1,132,324 $1,151,737 $1,135,660 11/23 $1,229,764 $1,224,851 $1,214,380 12/23 $1,266,603 $1,253,319 $1,244,312 1/24 $1,263,599 $1,246,918 $1,237,110 2/24 $1,260,635 $1,248,519 $1,237,082 3/24 $1,260,323 $1,248,480 $1,235,166 4/24 $1,246,671 $1,233,018 $1,220,237 5/24 $1,247,778 $1,229,401 $1,216,799 6/24 $1,270,501 $1,248,245 $1,237,954 7/24 $1,279,927 $1,259,622 $1,248,625 8/24 $1,287,941 $1,269,557 $1,257,437 9/24 $1,302,929 $1,282,104 $1,269,981 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class I 12.79% 1.58% 2.68% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg New York Municipal Bond Index 10.88% 1.35% 2.42% |
| AssetsNet | $ 362,823,791 |
| Holdings Count | Holding | 139 |
| Advisory Fees Paid, Amount | $ 1,420,337 |
| InvestmentCompanyPortfolioTurnover | 67% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $362,823,791 # of Portfolio Holdings 139 Portfolio Turnover Rate 67% Total Advisory Fees Paid $1,420,337 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 10.6% Housing 3.8% Industrial Development Revenue 3.9% Hospital 4.0% Electric Utilities 6.9% General Obligations 7.7% Education 8.0% Water and Sewer 8.4% Transportation 18.9% Special Tax Revenue 27.8% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 6.4% B 1.2% BB 1.0% BBB 13.0% A 6.7% AA 54.8% AAA 16.9% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000013139 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance Ohio Municipal Income Fund |
| Class Name | Class A |
| Trading Symbol | ETOHX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance Ohio Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B319"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $96 0.91% |
| Expenses Paid, Amount | $ 96 |
| Expense Ratio, Percent | 0.91% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↓ Security selections and an underweight position in bonds with coupon rates below 4% detracted from Index-relative returns during the period ↓ Security selections and an underweight position in the transportation sector detracted from the Fund’s returns relative to the Index during the period ↓ Security selections in bonds with 22 years or more remaining to maturity detracted from Fund performance relative to the Index during the period ↑ An overweight position in bonds rated BBB and below helped Fund returns as lower-credit-quality bonds generally outperformed higher-credit-quality bonds ↑ Security selections and an overweight position in the health care sector ― the best-performing sector within the Index ― contributed to Index-relative performance during the period ↑ Fund management’s use of leveraged investments, and security selections within those investments, magnified the Fund’s positive return and contributed to performance versus the Index during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class A with Maximum Sales Charge Bloomberg Municipal Bond Index Bloomberg Ohio Municipal Bond Index 9/14 $9,675 $10,000 $10,000 10/14 $9,758 $10,069 $10,073 11/14 $9,725 $10,086 $10,089 12/14 $9,787 $10,137 $10,152 1/15 $9,946 $10,317 $10,357 2/15 $9,859 $10,210 $10,235 3/15 $9,878 $10,240 $10,271 4/15 $9,834 $10,186 $10,209 5/15 $9,800 $10,158 $10,192 6/15 $9,777 $10,148 $10,179 7/15 $9,830 $10,222 $10,259 8/15 $9,851 $10,242 $10,286 9/15 $9,915 $10,316 $10,358 10/15 $9,958 $10,357 $10,395 11/15 $10,043 $10,398 $10,448 12/15 $10,128 $10,472 $10,531 1/16 $10,247 $10,596 $10,653 2/16 $10,222 $10,613 $10,670 3/16 $10,286 $10,647 $10,714 4/16 $10,361 $10,725 $10,796 5/16 $10,391 $10,754 $10,817 6/16 $10,567 $10,925 $10,998 7/16 $10,529 $10,932 $10,988 8/16 $10,592 $10,947 $10,996 9/16 $10,542 $10,892 $10,944 10/16 $10,436 $10,778 $10,836 11/16 $10,044 $10,376 $10,436 12/16 $10,176 $10,497 $10,563 1/17 $10,193 $10,567 $10,634 2/17 $10,234 $10,640 $10,710 3/17 $10,264 $10,663 $10,731 4/17 $10,351 $10,741 $10,797 5/17 $10,520 $10,911 $10,972 6/17 $10,469 $10,872 $10,946 7/17 $10,534 $10,960 $11,027 8/17 $10,588 $11,043 $11,101 9/17 $10,584 $10,987 $11,039 10/17 $10,555 $11,014 $11,054 11/17 $10,503 $10,955 $10,999 12/17 $10,637 $11,069 $11,113 1/18 $10,474 $10,939 $10,984 2/18 $10,431 $10,906 $10,954 3/18 $10,470 $10,947 $10,992 4/18 $10,450 $10,908 $10,945 5/18 $10,572 $11,033 $11,067 6/18 $10,564 $11,042 $11,073 7/18 $10,603 $11,069 $11,101 8/18 $10,617 $11,097 $11,131 9/18 $10,536 $11,025 $11,057 10/18 $10,442 $10,957 $10,996 11/18 $10,592 $11,079 $11,115 12/18 $10,730 $11,211 $11,259 1/19 $10,831 $11,296 $11,357 2/19 $10,908 $11,357 $11,408 3/19 $11,084 $11,536 $11,574 4/19 $11,125 $11,579 $11,613 5/19 $11,276 $11,739 $11,763 6/19 $11,316 $11,782 $11,812 7/19 $11,405 $11,877 $11,897 8/19 $11,581 $12,065 $12,082 9/19 $11,497 $11,968 $11,983 10/19 $11,499 $11,989 $12,009 11/19 $11,514 $12,019 $12,037 12/19 $11,541 $12,056 $12,069 1/20 $11,743 $12,273 $12,275 2/20 $11,883 $12,431 $12,439 3/20 $11,531 $11,980 $12,056 4/20 $11,384 $11,830 $11,934 5/20 $11,795 $12,206 $12,327 6/20 $11,836 $12,307 $12,400 7/20 $12,016 $12,514 $12,615 8/20 $11,967 $12,455 $12,553 9/20 $11,969 $12,458 $12,577 10/20 $11,945 $12,420 $12,534 11/20 $12,114 $12,608 $12,688 12/20 $12,166 $12,685 $12,748 1/21 $12,217 $12,765 $12,809 2/21 $11,999 $12,563 $12,610 3/21 $12,090 $12,640 $12,675 4/21 $12,181 $12,746 $12,779 5/21 $12,220 $12,784 $12,820 6/21 $12,259 $12,819 $12,845 7/21 $12,337 $12,926 $12,957 8/21 $12,296 $12,878 $12,908 9/21 $12,203 $12,785 $12,808 10/21 $12,176 $12,748 $12,762 11/21 $12,267 $12,856 $12,868 12/21 $12,280 $12,877 $12,894 1/22 $11,960 $12,525 $12,553 2/22 $11,920 $12,480 $12,508 3/22 $11,586 $12,075 $12,105 4/22 $11,291 $11,741 $11,780 5/22 $11,425 $11,916 $11,925 6/22 $11,223 $11,720 $11,737 7/22 $11,491 $12,030 $12,060 8/22 $11,247 $11,766 $11,774 9/22 $10,853 $11,315 $11,322 10/22 $10,785 $11,221 $11,212 11/22 $11,260 $11,746 $11,725 12/22 $11,259 $11,779 $11,773 1/23 $11,573 $12,118 $12,101 2/23 $11,314 $11,844 $11,835 3/23 $11,519 $12,106 $12,076 4/23 $11,519 $12,079 $12,028 5/23 $11,381 $11,974 $11,905 6/23 $11,492 $12,094 $12,045 7/23 $11,520 $12,142 $12,095 8/23 $11,368 $11,967 $11,906 9/23 $11,050 $11,616 $11,564 10/23 $10,884 $11,517 $11,470 11/23 $11,599 $12,249 $12,189 12/23 $11,867 $12,533 $12,466 1/24 $11,855 $12,469 $12,383 2/24 $11,857 $12,485 $12,408 3/24 $11,831 $12,485 $12,417 4/24 $11,707 $12,330 $12,243 5/24 $11,669 $12,294 $12,202 6/24 $11,858 $12,482 $12,406 7/24 $11,935 $12,596 $12,519 8/24 $12,026 $12,696 $12,621 9/24 $12,158 $12,821 $12,744 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class A 10.05% 1.13% 2.31% Class A with 3.25% Maximum Sales Charge 6.42% 0.46% 1.97% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg Ohio Municipal Bond Index 10.21% 1.24% 2.45% |
| AssetsNet | $ 188,658,528 |
| Holdings Count | Holding | 122 |
| Advisory Fees Paid, Amount | $ 713,889 |
| InvestmentCompanyPortfolioTurnover | 40% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $188,658,528 # of Portfolio Holdings 122 Portfolio Turnover Rate 40% Total Advisory Fees Paid $713,889 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 4.4% Special Tax Revenue 3.2% Industrial Development Revenue 3.2% Other Revenue 3.7% Transportation 3.7% Bond Bank 3.9% Water and Sewer 5.4% Electric Utilities 9.5% Education 15.7% Hospital 16.5% General Obligations 30.8% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 4.5% B 0.1% BB 1.2% BBB 5.8% A 15.2% AA 61.6% AAA 11.6% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000013141 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance Ohio Municipal Income Fund |
| Class Name | Class C |
| Trading Symbol | ECOHX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance Ohio Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B344"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class C $174 1.66% |
| Expenses Paid, Amount | $ 174 |
| Expense Ratio, Percent | 1.66% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↓ Security selections and an underweight position in bonds with coupon rates below 4% detracted from Index-relative returns during the period ↓ Security selections and an underweight position in the transportation sector detracted from the Fund’s returns relative to the Index during the period ↓ Security selections in bonds with 22 years or more remaining to maturity detracted from Fund performance relative to the Index during the period ↑ An overweight position in bonds rated BBB and below helped Fund returns as lower-credit-quality bonds generally outperformed higher-credit-quality bonds ↑ Security selections and an overweight position in the health care sector ― the best-performing sector within the Index ― contributed to Index-relative performance during the period ↑ Fund management’s use of leveraged investments, and security selections within those investments, magnified the Fund’s positive return and contributed to performance versus the Index during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class C Bloomberg Municipal Bond Index Bloomberg Ohio Municipal Bond Index 9/14 $10,000 $10,000 $10,000 10/14 $10,080 $10,069 $10,073 11/14 $10,039 $10,086 $10,089 12/14 $10,097 $10,137 $10,152 1/15 $10,254 $10,317 $10,357 2/15 $10,159 $10,210 $10,235 3/15 $10,183 $10,240 $10,271 4/15 $10,120 $10,186 $10,209 5/15 $10,079 $10,158 $10,192 6/15 $10,049 $10,148 $10,179 7/15 $10,097 $10,222 $10,259 8/15 $10,111 $10,242 $10,286 9/15 $10,183 $10,316 $10,358 10/15 $10,209 $10,357 $10,395 11/15 $10,290 $10,398 $10,448 12/15 $10,382 $10,472 $10,531 1/16 $10,497 $10,596 $10,653 2/16 $10,454 $10,613 $10,670 3/16 $10,524 $10,647 $10,714 4/16 $10,595 $10,725 $10,796 5/16 $10,607 $10,754 $10,817 6/16 $10,791 $10,925 $10,998 7/16 $10,734 $10,932 $10,988 8/16 $10,792 $10,947 $10,996 9/16 $10,746 $10,892 $10,944 10/16 $10,630 $10,778 $10,836 11/16 $10,226 $10,376 $10,436 12/16 $10,353 $10,497 $10,563 1/17 $10,352 $10,567 $10,634 2/17 $10,388 $10,640 $10,710 3/17 $10,423 $10,663 $10,731 4/17 $10,505 $10,741 $10,797 5/17 $10,658 $10,911 $10,972 6/17 $10,612 $10,872 $10,946 7/17 $10,659 $10,960 $11,027 8/17 $10,707 $11,043 $11,101 9/17 $10,696 $10,987 $11,039 10/17 $10,660 $11,014 $11,054 11/17 $10,612 $10,955 $10,999 12/17 $10,741 $11,069 $11,113 1/18 $10,558 $10,939 $10,984 2/18 $10,508 $10,906 $10,954 3/18 $10,553 $10,947 $10,992 4/18 $10,526 $10,908 $10,945 5/18 $10,631 $11,033 $11,067 6/18 $10,615 $11,042 $11,073 7/18 $10,648 $11,069 $11,101 8/18 $10,656 $11,097 $11,131 9/18 $10,579 $11,025 $11,057 10/18 $10,479 $10,957 $10,996 11/18 $10,623 $11,079 $11,115 12/18 $10,754 $11,211 $11,259 1/19 $10,836 $11,296 $11,357 2/19 $10,920 $11,357 $11,408 3/19 $11,088 $11,536 $11,574 4/19 $11,110 $11,579 $11,613 5/19 $11,254 $11,739 $11,763 6/19 $11,299 $11,782 $11,812 7/19 $11,381 $11,877 $11,897 8/19 $11,537 $12,065 $12,082 9/19 $11,446 $11,968 $11,983 10/19 $11,441 $11,989 $12,009 11/19 $11,449 $12,019 $12,037 12/19 $11,481 $12,056 $12,069 1/20 $11,674 $12,273 $12,275 2/20 $11,807 $12,431 $12,439 3/20 $11,437 $11,980 $12,056 4/20 $11,284 $11,830 $11,934 5/20 $11,685 $12,206 $12,327 6/20 $11,731 $12,307 $12,400 7/20 $11,902 $12,514 $12,615 8/20 $11,846 $12,455 $12,553 9/20 $11,841 $12,458 $12,577 10/20 $11,809 $12,420 $12,534 11/20 $11,956 $12,608 $12,688 12/20 $12,000 $12,685 $12,748 1/21 $12,043 $12,765 $12,809 2/21 $11,833 $12,563 $12,610 3/21 $11,902 $12,640 $12,675 4/21 $11,998 $12,746 $12,779 5/21 $12,016 $12,784 $12,820 6/21 $12,047 $12,819 $12,845 7/21 $12,128 $12,926 $12,957 8/21 $12,081 $12,878 $12,908 9/21 $11,982 $12,785 $12,808 10/21 $11,947 $12,748 $12,762 11/21 $12,030 $12,856 $12,868 12/21 $12,034 $12,877 $12,894 1/22 $11,713 $12,525 $12,553 2/22 $11,654 $12,480 $12,508 3/22 $11,333 $12,075 $12,105 4/22 $11,038 $11,741 $11,780 5/22 $11,161 $11,916 $11,925 6/22 $10,957 $11,720 $11,737 7/22 $11,212 $12,030 $12,060 8/22 $10,954 $11,766 $11,774 9/22 $10,564 $11,315 $11,322 10/22 $10,490 $11,221 $11,212 11/22 $10,959 $11,746 $11,725 12/22 $10,952 $11,779 $11,773 1/23 $11,249 $12,118 $12,101 2/23 $10,978 $11,844 $11,835 3/23 $11,183 $12,106 $12,076 4/23 $11,163 $12,079 $12,028 5/23 $11,035 $11,974 $11,905 6/23 $11,136 $12,094 $12,045 7/23 $11,156 $12,142 $12,095 8/23 $11,002 $11,967 $11,906 9/23 $10,688 $11,616 $11,564 10/23 $10,521 $11,517 $11,470 11/23 $11,191 $12,249 $12,189 12/23 $11,443 $12,533 $12,466 1/24 $11,424 $12,469 $12,383 2/24 $11,420 $12,485 $12,408 3/24 $11,387 $12,485 $12,417 4/24 $11,274 $12,330 $12,243 5/24 $11,230 $12,294 $12,202 6/24 $11,392 $12,482 $12,406 7/24 $11,472 $12,596 $12,519 8/24 $11,552 $12,696 $12,621 9/24 $11,836 $12,821 $12,744 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class C 9.10% 0.37% 1.70% Class C with 1% Maximum Deferred Sales Charge 8.10% 0.37% 1.70% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg Ohio Municipal Bond Index 10.21% 1.24% 2.45% |
| AssetsNet | $ 188,658,528 |
| Holdings Count | Holding | 122 |
| Advisory Fees Paid, Amount | $ 713,889 |
| InvestmentCompanyPortfolioTurnover | 40% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $188,658,528 # of Portfolio Holdings 122 Portfolio Turnover Rate 40% Total Advisory Fees Paid $713,889 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 4.4% Special Tax Revenue 3.2% Industrial Development Revenue 3.2% Other Revenue 3.7% Transportation 3.7% Bond Bank 3.9% Water and Sewer 5.4% Electric Utilities 9.5% Education 15.7% Hospital 16.5% General Obligations 30.8% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 4.5% B 0.1% BB 1.2% BBB 5.8% A 15.2% AA 61.6% AAA 11.6% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| C000092721 | |
| Shareholder Report [Line Items] | |
| Fund Name | Eaton Vance Ohio Municipal Income Fund |
| Class Name | Class I |
| Trading Symbol | EIOHX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the Eaton Vance Ohio Municipal Income Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at www.eatonvance.com/open-end-mutual-fund-documents.php |
| Additional Information Phone Number | 1-800-262-1122 |
| Additional Information Website | www.eatonvance.com/open-end-mutual-fund-documents.php</span>" id="sjs-B369"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left;">www.eatonvance.com/open-end-mutual-fund-documents.php</span> |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class I $75 0.71% |
| Expenses Paid, Amount | $ 75 |
| Expense Ratio, Percent | 0.71% |
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? Key contributors to (↑) and detractors from (↓) performance, relative to the Bloomberg Municipal Bond Index (the Index): ↓ Security selections and an underweight position in bonds with coupon rates below 4% detracted from Index-relative returns during the period ↓ Security selections and an underweight position in the transportation sector detracted from the Fund’s returns relative to the Index during the period ↓ Security selections in bonds with 22 years or more remaining to maturity detracted from Fund performance relative to the Index during the period ↑ An overweight position in bonds rated BBB and below helped Fund returns as lower-credit-quality bonds generally outperformed higher-credit-quality bonds ↑ Security selections and an overweight position in the health care sector ― the best-performing sector within the Index ― contributed to Index-relative performance during the period ↑ Fund management’s use of leveraged investments, and security selections within those investments, magnified the Fund’s positive return and contributed to performance versus the Index during the period |
| Performance Past Does Not Indicate Future [Text] | THE FUND'S PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. |
| Line Graph [Table Text Block] | Class I Bloomberg Municipal Bond Index Bloomberg Ohio Municipal Bond Index 9/14 $1,000,000 $1,000,000 $1,000,000 10/14 $1,008,793 $1,006,857 $1,007,339 11/14 $1,005,507 $1,008,598 $1,008,936 12/14 $1,012,115 $1,013,687 $1,015,221 1/15 $1,029,762 $1,031,654 $1,035,744 2/15 $1,019,836 $1,021,012 $1,023,497 3/15 $1,023,155 $1,023,960 $1,027,092 4/15 $1,017,625 $1,018,588 $1,020,941 5/15 $1,015,406 $1,015,774 $1,019,192 6/15 $1,013,169 $1,014,848 $1,017,875 7/15 $1,017,707 $1,022,199 $1,025,920 8/15 $1,019,996 $1,024,207 $1,028,588 9/15 $1,028,002 $1,031,626 $1,035,807 10/15 $1,031,428 $1,035,727 $1,039,471 11/15 $1,040,476 $1,039,845 $1,044,771 12/15 $1,050,606 $1,047,151 $1,053,094 1/16 $1,063,055 $1,059,645 $1,065,332 2/16 $1,060,640 $1,061,312 $1,066,981 3/16 $1,067,460 $1,064,674 $1,071,389 4/16 $1,075,448 $1,072,502 $1,079,556 5/16 $1,077,593 $1,075,403 $1,081,694 6/16 $1,097,144 $1,092,511 $1,099,835 7/16 $1,092,252 $1,093,178 $1,098,783 8/16 $1,100,163 $1,094,653 $1,099,643 9/16 $1,095,182 $1,089,190 $1,094,351 10/16 $1,084,272 $1,077,763 $1,083,640 11/16 $1,043,861 $1,037,568 $1,043,628 12/16 $1,057,668 $1,049,749 $1,056,318 1/17 $1,058,440 $1,056,669 $1,063,359 2/17 $1,062,890 $1,064,007 $1,070,999 3/17 $1,067,337 $1,066,317 $1,073,056 4/17 $1,076,603 $1,074,054 $1,079,712 5/17 $1,094,305 $1,091,100 $1,097,242 6/17 $1,089,209 $1,087,187 $1,094,628 7/17 $1,094,963 $1,095,983 $1,102,730 8/17 $1,100,728 $1,104,323 $1,110,085 9/17 $1,100,433 $1,098,708 $1,103,931 10/17 $1,098,856 $1,101,390 $1,105,389 11/17 $1,093,614 $1,095,493 $1,099,917 12/17 $1,107,746 $1,106,943 $1,111,265 1/18 $1,089,785 $1,093,911 $1,098,398 2/18 $1,085,455 $1,090,642 $1,095,437 3/18 $1,090,963 $1,094,668 $1,099,196 4/18 $1,089,019 $1,090,761 $1,094,492 5/18 $1,101,978 $1,103,252 $1,106,686 6/18 $1,099,986 $1,104,193 $1,107,326 7/18 $1,104,261 $1,106,873 $1,110,102 8/18 $1,105,983 $1,109,715 $1,113,088 9/18 $1,098,936 $1,102,531 $1,105,683 10/18 $1,089,370 $1,095,742 $1,099,577 11/18 $1,105,153 $1,107,870 $1,111,488 12/18 $1,119,728 $1,121,135 $1,125,852 1/19 $1,129,178 $1,129,609 $1,135,681 2/19 $1,138,700 $1,135,658 $1,140,771 3/19 $1,157,200 $1,153,610 $1,157,416 4/19 $1,160,355 $1,157,945 $1,161,273 5/19 $1,176,323 $1,173,909 $1,176,304 6/19 $1,181,976 $1,178,244 $1,181,206 7/19 $1,191,503 $1,187,739 $1,189,734 8/19 $1,208,791 $1,206,474 $1,208,189 9/19 $1,200,178 $1,196,803 $1,198,269 10/19 $1,200,620 $1,198,948 $1,200,850 11/19 $1,202,345 $1,201,946 $1,203,706 12/19 $1,206,678 $1,205,616 $1,206,914 1/20 $1,227,999 $1,227,277 $1,227,465 2/20 $1,242,851 $1,243,103 $1,243,902 3/20 $1,204,949 $1,198,012 $1,205,555 4/20 $1,189,799 $1,182,977 $1,193,369 5/20 $1,232,992 $1,220,609 $1,232,701 6/20 $1,238,746 $1,230,655 $1,240,015 7/20 $1,257,817 $1,251,382 $1,261,511 8/20 $1,252,891 $1,245,511 $1,255,318 9/20 $1,253,369 $1,245,775 $1,257,720 10/20 $1,251,045 $1,242,033 $1,253,439 11/20 $1,267,558 $1,260,776 $1,268,784 12/20 $1,273,236 $1,268,456 $1,274,786 1/21 $1,278,849 $1,276,540 $1,280,863 2/21 $1,257,496 $1,256,257 $1,261,004 3/21 $1,265,900 $1,264,005 $1,267,535 4/21 $1,277,039 $1,274,607 $1,277,876 5/21 $1,279,966 $1,278,410 $1,281,952 6/21 $1,284,272 $1,281,920 $1,284,528 7/21 $1,294,013 $1,292,552 $1,295,722 8/21 $1,289,975 $1,287,808 $1,290,777 9/21 $1,280,430 $1,278,514 $1,280,795 10/21 $1,277,764 $1,274,776 $1,276,194 11/21 $1,287,593 $1,285,628 $1,286,770 12/21 $1,289,118 $1,287,702 $1,289,357 1/22 $1,255,795 $1,252,454 $1,255,313 2/22 $1,250,415 $1,247,967 $1,250,775 3/22 $1,216,950 $1,207,512 $1,210,537 4/22 $1,186,274 $1,174,113 $1,177,954 5/22 $1,199,052 $1,191,554 $1,192,462 6/22 $1,179,471 $1,172,038 $1,173,677 7/22 $1,207,803 $1,203,006 $1,206,014 8/22 $1,180,997 $1,176,640 $1,177,354 9/22 $1,139,861 $1,131,480 $1,132,199 10/22 $1,132,895 $1,122,070 $1,121,167 11/22 $1,184,364 $1,174,553 $1,172,509 12/22 $1,184,508 $1,177,916 $1,177,253 1/23 $1,217,627 $1,211,751 $1,210,091 2/23 $1,189,164 $1,184,351 $1,183,492 3/23 $1,212,369 $1,210,629 $1,207,645 4/23 $1,211,141 $1,207,864 $1,202,812 5/23 $1,198,270 $1,197,397 $1,190,467 6/23 $1,210,150 $1,209,391 $1,204,450 7/23 $1,213,310 $1,214,176 $1,209,500 8/23 $1,197,536 $1,196,696 $1,190,629 9/23 $1,164,271 $1,161,622 $1,156,387 10/23 $1,147,043 $1,151,737 $1,146,974 11/23 $1,220,986 $1,224,851 $1,218,904 12/23 $1,249,397 $1,253,319 $1,246,628 1/24 $1,248,349 $1,246,918 $1,238,276 2/24 $1,248,815 $1,248,519 $1,240,815 3/24 $1,246,236 $1,248,480 $1,241,716 4/24 $1,234,903 $1,233,018 $1,224,339 5/24 $1,231,055 $1,229,401 $1,220,243 6/24 $1,249,727 $1,248,245 $1,240,614 7/24 $1,259,514 $1,259,622 $1,251,894 8/24 $1,269,342 $1,269,557 $1,262,142 9/24 $1,282,142 $1,282,104 $1,274,424 |
| Average Annual Return [Table Text Block] | Fund 1 Year 5 Years 10 Years Class I 10.13% 1.33% 2.51% Bloomberg Municipal Bond Index 10.37% 1.38% 2.51% Bloomberg Ohio Municipal Bond Index 10.21% 1.24% 2.45% |
| AssetsNet | $ 188,658,528 |
| Holdings Count | Holding | 122 |
| Advisory Fees Paid, Amount | $ 713,889 |
| InvestmentCompanyPortfolioTurnover | 40% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $188,658,528 # of Portfolio Holdings 122 Portfolio Turnover Rate 40% Total Advisory Fees Paid $713,889 |
| Holdings [Text Block] | Sector Allocation (% of total investments) Value Value Other Footnote Reference 4.4% Special Tax Revenue 3.2% Industrial Development Revenue 3.2% Other Revenue 3.7% Transportation 3.7% Bond Bank 3.9% Water and Sewer 5.4% Electric Utilities 9.5% Education 15.7% Hospital 16.5% General Obligations 30.8% Footnote Description Footnote * Sectors less than 3% each Credit Quality (% of total investments) Footnote Reference Footnote Reference Value Value Not Rated 4.5% B 0.1% BB 1.2% BBB 5.8% A 15.2% AA 61.6% AAA 11.6% Footnote Description Footnote a Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P and Fitch scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above. Footnote b The chart includes the municipal bonds held by a trust that issues residual interest bonds. |
| Material Fund Change [Text Block] | |
| Updated Prospectus Phone Number | 1-800-262-1122 |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Sep. 30, 2024 | Aug. 31, 2024 | Jul. 31, 2024 | Jun. 30, 2024 | May 31, 2024 | Apr. 30, 2024 | Mar. 31, 2024 | Feb. 29, 2024 | Jan. 31, 2024 | Dec. 31, 2023 | Nov. 30, 2023 | Oct. 31, 2023 | Sep. 30, 2023 | Aug. 31, 2023 | Jul. 31, 2023 | Jun. 30, 2023 | May 31, 2023 | Apr. 30, 2023 | Mar. 31, 2023 | Feb. 28, 2023 | Jan. 31, 2023 | Dec. 31, 2022 | Nov. 30, 2022 | Oct. 31, 2022 | Sep. 30, 2022 | Aug. 31, 2022 | Jul. 31, 2022 | Jun. 30, 2022 | May 31, 2022 | Apr. 30, 2022 | Mar. 31, 2022 | Feb. 28, 2022 | Jan. 31, 2022 | Dec. 31, 2021 | Nov. 30, 2021 | Oct. 31, 2021 | Sep. 30, 2021 | Aug. 31, 2021 | Jul. 31, 2021 | Jun. 30, 2021 | May 31, 2021 | Apr. 30, 2021 | Mar. 31, 2021 | Feb. 28, 2021 | Jan. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2020 | Oct. 31, 2020 | Sep. 30, 2020 | Aug. 31, 2020 | Jul. 31, 2020 | Jun. 30, 2020 | May 31, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | Feb. 29, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Nov. 30, 2019 | Oct. 31, 2019 | Sep. 30, 2019 | Aug. 31, 2019 | Jul. 31, 2019 | Jun. 30, 2019 | May 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Jan. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Oct. 31, 2018 | Sep. 30, 2018 | Aug. 31, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | May 31, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Feb. 28, 2018 | Jan. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2017 | Oct. 31, 2017 | Sep. 30, 2017 | Aug. 31, 2017 | Jul. 31, 2017 | Jun. 30, 2017 | May 31, 2017 | Apr. 30, 2017 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2016 | Oct. 31, 2016 | Sep. 30, 2016 | Aug. 31, 2016 | Jul. 31, 2016 | Jun. 30, 2016 | May 31, 2016 | Apr. 30, 2016 | Mar. 31, 2016 | Feb. 29, 2016 | Jan. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2015 | Oct. 31, 2015 | Sep. 30, 2015 | Aug. 31, 2015 | Jul. 31, 2015 | Jun. 30, 2015 | May 31, 2015 | Apr. 30, 2015 | Mar. 31, 2015 | Feb. 28, 2015 | Jan. 31, 2015 | Dec. 31, 2014 | Nov. 30, 2014 | Oct. 31, 2014 | Sep. 30, 2014 | |
| C000013166 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class A with Maximum Sales Charge | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,691 | $ 12,540 | $ 12,432 | $ 12,325 | $ 12,181 | $ 12,172 | $ 12,282 | $ 12,272 | $ 12,262 | $ 12,264 | $ 12,014 | $ 11,347 | $ 11,516 | $ 11,791 | $ 11,878 | $ 11,847 | $ 11,757 | $ 11,832 | $ 11,836 | $ 11,630 | $ 11,855 | $ 11,524 | $ 11,518 | $ 11,050 | $ 11,140 | $ 11,453 | $ 11,626 | $ 11,400 | $ 11,540 | $ 11,420 | $ 11,736 | $ 12,121 | $ 12,187 | $ 12,494 | $ 12,496 | $ 12,404 | $ 12,426 | $ 12,515 | $ 12,571 | $ 12,467 | $ 12,433 | $ 12,399 | $ 12,298 | $ 12,266 | $ 12,476 | $ 12,430 | $ 12,373 | $ 12,157 | $ 12,175 | $ 12,183 | $ 12,266 | $ 12,028 | $ 11,908 | $ 11,522 | $ 11,665 | $ 12,161 | $ 11,997 | $ 11,802 | $ 11,763 | $ 11,753 | $ 11,755 | $ 11,843 | $ 11,605 | $ 11,518 | $ 11,474 | $ 11,300 | $ 11,255 | $ 11,037 | $ 10,991 | $ 10,936 | $ 10,826 | $ 10,728 | $ 10,832 | $ 10,914 | $ 10,881 | $ 10,868 | $ 10,845 | $ 10,674 | $ 10,713 | $ 10,659 | $ 10,687 | $ 10,821 | $ 10,716 | $ 10,756 | $ 10,776 | $ 10,827 | $ 10,743 | $ 10,679 | $ 10,708 | $ 10,563 | $ 10,489 | $ 10,455 | $ 10,391 | $ 10,348 | $ 10,266 | $ 10,720 | $ 10,842 | $ 10,892 | $ 10,861 | $ 10,887 | $ 10,654 | $ 10,590 | $ 10,495 | $ 10,430 | $ 10,413 | $ 10,277 | $ 10,189 | $ 10,112 | $ 10,054 | $ 9,957 | $ 9,909 | $ 9,850 | $ 9,878 | $ 9,876 | $ 9,932 | $ 9,892 | $ 9,995 | $ 9,822 | $ 9,745 | $ 9,743 | $ 9,675 |
| C000013168 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,355 | 12,029 | 11,927 | 11,838 | 11,712 | 11,711 | 11,824 | 11,824 | 11,822 | 11,823 | 11,597 | 10,960 | 11,133 | 11,393 | 11,494 | 11,459 | 11,387 | 11,462 | 11,476 | 11,282 | 11,504 | 11,201 | 11,205 | 10,746 | 10,849 | 11,151 | 11,330 | 11,113 | 11,257 | 11,151 | 11,469 | 11,849 | 11,927 | 12,224 | 12,247 | 12,158 | 12,178 | 12,281 | 12,337 | 12,248 | 12,232 | 12,193 | 12,106 | 12,080 | 12,301 | 12,260 | 12,220 | 12,010 | 12,038 | 12,043 | 12,141 | 11,907 | 11,800 | 11,430 | 11,569 | 12,075 | 11,920 | 11,730 | 11,698 | 11,696 | 11,707 | 11,799 | 11,575 | 11,491 | 11,452 | 11,284 | 11,244 | 11,042 | 11,000 | 10,949 | 10,851 | 10,752 | 10,874 | 10,961 | 10,922 | 10,917 | 10,911 | 10,746 | 10,786 | 10,735 | 10,774 | 10,917 | 10,822 | 10,864 | 10,883 | 10,947 | 10,864 | 10,814 | 10,843 | 10,704 | 10,642 | 10,614 | 10,552 | 10,525 | 10,443 | 10,906 | 11,037 | 11,091 | 11,065 | 11,103 | 10,877 | 10,815 | 10,730 | 10,666 | 10,656 | 10,526 | 10,438 | 10,371 | 10,317 | 10,229 | 10,184 | 10,117 | 10,156 | 10,163 | 10,223 | 10,187 | 10,301 | 10,138 | 10,060 | 10,067 | 10,000 |
| C000063954 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,342,862 | 1,328,400 | 1,315,376 | 1,305,066 | 1,288,320 | 1,288,281 | 1,298,437 | 1,298,393 | 1,296,988 | 1,295,700 | 1,270,308 | 1,199,630 | 1,217,135 | 1,244,690 | 1,254,841 | 1,250,090 | 1,241,574 | 1,247,925 | 1,248,122 | 1,227,383 | 1,249,679 | 1,215,699 | 1,214,809 | 1,164,095 | 1,174,510 | 1,205,975 | 1,225,132 | 1,199,885 | 1,214,361 | 1,201,506 | 1,234,484 | 1,275,960 | 1,282,637 | 1,313,401 | 1,314,541 | 1,303,434 | 1,305,481 | 1,315,702 | 1,320,075 | 1,310,159 | 1,306,273 | 1,301,294 | 1,291,574 | 1,286,744 | 1,309,744 | 1,304,636 | 1,298,354 | 1,275,430 | 1,277,103 | 1,276,428 | 1,286,077 | 1,259,696 | 1,246,975 | 1,207,454 | 1,221,059 | 1,273,859 | 1,256,500 | 1,235,774 | 1,231,491 | 1,230,210 | 1,230,122 | 1,239,055 | 1,213,958 | 1,204,626 | 1,198,572 | 1,180,148 | 1,175,195 | 1,153,362 | 1,148,313 | 1,142,260 | 1,130,616 | 1,120,092 | 1,130,725 | 1,139,089 | 1,135,381 | 1,132,725 | 1,131,145 | 1,113,118 | 1,116,974 | 1,111,072 | 1,113,824 | 1,127,472 | 1,116,267 | 1,120,235 | 1,122,088 | 1,127,118 | 1,118,167 | 1,111,297 | 1,114,080 | 1,098,759 | 1,089,765 | 1,087,131 | 1,080,214 | 1,075,590 | 1,066,822 | 1,112,678 | 1,126,090 | 1,131,127 | 1,127,607 | 1,130,147 | 1,105,723 | 1,098,885 | 1,088,808 | 1,081,781 | 1,079,832 | 1,065,492 | 1,055,218 | 1,047,970 | 1,041,803 | 1,031,567 | 1,026,384 | 1,019,030 | 1,021,687 | 1,022,274 | 1,027,812 | 1,023,432 | 1,033,945 | 1,015,843 | 1,007,637 | 1,007,255 | 1,000,000 |
| C000013108 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class A with Maximum Sales Charge | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 11,477 | 11,351 | 11,291 | 11,189 | 10,990 | 11,057 | 11,179 | 11,191 | 11,203 | 11,216 | 10,966 | 10,291 | 10,468 | 10,768 | 10,863 | 10,863 | 10,781 | 10,876 | 10,877 | 10,662 | 10,918 | 10,610 | 10,625 | 10,132 | 10,187 | 10,590 | 10,872 | 10,559 | 10,736 | 10,651 | 11,027 | 11,391 | 11,451 | 11,750 | 11,757 | 11,673 | 11,695 | 11,795 | 11,830 | 11,749 | 11,718 | 11,687 | 11,605 | 11,563 | 11,751 | 11,721 | 11,661 | 11,523 | 11,553 | 11,557 | 11,611 | 11,436 | 11,361 | 11,033 | 11,210 | 11,601 | 11,436 | 11,223 | 11,199 | 11,200 | 11,202 | 11,310 | 11,125 | 11,051 | 11,013 | 10,889 | 10,838 | 10,689 | 10,626 | 10,563 | 10,452 | 10,352 | 10,423 | 10,470 | 10,467 | 10,454 | 10,452 | 10,354 | 10,388 | 10,325 | 10,368 | 10,529 | 10,393 | 10,445 | 10,441 | 10,484 | 10,411 | 10,350 | 10,392 | 10,239 | 10,178 | 10,138 | 10,086 | 10,070 | 9,927 | 10,344 | 10,442 | 10,506 | 10,479 | 10,530 | 10,366 | 10,339 | 10,243 | 10,180 | 10,230 | 10,140 | 10,043 | 9,970 | 9,926 | 9,875 | 9,836 | 9,775 | 9,779 | 9,816 | 9,884 | 9,845 | 9,967 | 9,811 | 9,728 | 9,757 | 9,675 |
| C000034083 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 11,184 | 10,899 | 10,849 | 10,758 | 10,572 | 10,644 | 10,769 | 10,787 | 10,791 | 10,824 | 10,590 | 9,943 | 10,121 | 10,418 | 10,517 | 10,510 | 10,450 | 10,549 | 10,556 | 10,354 | 10,609 | 10,316 | 10,324 | 9,850 | 9,924 | 10,323 | 10,592 | 10,306 | 10,485 | 10,395 | 10,769 | 11,132 | 11,211 | 11,511 | 11,525 | 11,450 | 11,466 | 11,584 | 11,626 | 11,541 | 11,517 | 11,494 | 11,421 | 11,399 | 11,592 | 11,569 | 11,516 | 11,386 | 11,421 | 11,431 | 11,492 | 11,325 | 11,257 | 10,938 | 11,120 | 11,515 | 11,371 | 11,166 | 11,149 | 11,144 | 11,153 | 11,268 | 11,103 | 11,024 | 11,005 | 10,876 | 10,831 | 10,702 | 10,632 | 10,589 | 10,472 | 10,378 | 10,468 | 10,521 | 10,525 | 10,506 | 10,522 | 10,431 | 10,472 | 10,415 | 10,464 | 10,621 | 10,502 | 10,550 | 10,552 | 10,602 | 10,546 | 10,480 | 10,529 | 10,380 | 10,336 | 10,291 | 10,245 | 10,246 | 10,107 | 10,537 | 10,644 | 10,716 | 10,695 | 10,754 | 10,593 | 10,572 | 10,481 | 10,423 | 10,480 | 10,395 | 10,290 | 10,221 | 10,195 | 10,149 | 10,103 | 10,047 | 10,068 | 10,101 | 10,178 | 10,145 | 10,287 | 10,121 | 10,054 | 10,089 | 10,000 |
| C000013110 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,210,123 | 1,196,146 | 1,189,657 | 1,178,719 | 1,157,495 | 1,164,371 | 1,177,099 | 1,178,164 | 1,179,202 | 1,180,335 | 1,153,874 | 1,082,615 | 1,101,074 | 1,133,920 | 1,143,748 | 1,142,098 | 1,134,724 | 1,143,081 | 1,142,961 | 1,120,184 | 1,146,869 | 1,114,356 | 1,115,739 | 1,063,768 | 1,070,827 | 1,111,549 | 1,140,967 | 1,109,288 | 1,126,329 | 1,117,131 | 1,156,390 | 1,194,355 | 1,200,523 | 1,232,975 | 1,233,536 | 1,223,207 | 1,225,267 | 1,235,494 | 1,240,389 | 1,230,273 | 1,226,790 | 1,223,389 | 1,214,636 | 1,211,368 | 1,229,529 | 1,226,087 | 1,221,042 | 1,205,211 | 1,208,173 | 1,208,457 | 1,213,997 | 1,195,541 | 1,186,228 | 1,153,074 | 1,170,069 | 1,210,744 | 1,194,692 | 1,172,251 | 1,169,499 | 1,169,435 | 1,169,447 | 1,179,238 | 1,161,002 | 1,151,818 | 1,148,977 | 1,134,566 | 1,130,326 | 1,114,627 | 1,107,840 | 1,101,134 | 1,089,354 | 1,078,776 | 1,085,955 | 1,090,636 | 1,090,243 | 1,088,603 | 1,088,213 | 1,077,891 | 1,081,267 | 1,074,467 | 1,078,753 | 1,094,136 | 1,080,963 | 1,086,262 | 1,084,363 | 1,088,690 | 1,082,120 | 1,075,588 | 1,079,852 | 1,063,703 | 1,057,190 | 1,052,857 | 1,047,385 | 1,045,460 | 1,030,524 | 1,073,560 | 1,083,601 | 1,090,040 | 1,087,064 | 1,092,154 | 1,074,955 | 1,071,941 | 1,061,864 | 1,055,198 | 1,060,111 | 1,050,744 | 1,040,475 | 1,032,712 | 1,028,051 | 1,022,612 | 1,017,230 | 1,010,694 | 1,012,074 | 1,014,604 | 1,022,668 | 1,017,340 | 1,030,893 | 1,013,416 | 1,005,856 | 1,008,636 | 1,000,000 |
| C000013123 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class A with Maximum Sales Charge | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,891 | 12,726 | 12,660 | 12,566 | 12,377 | 12,338 | 12,486 | 12,488 | 12,489 | 12,477 | 12,133 | 11,301 | 11,526 | 11,895 | 12,055 | 12,019 | 11,892 | 11,973 | 11,937 | 11,707 | 12,005 | 11,585 | 11,652 | 11,018 | 11,149 | 11,599 | 11,885 | 11,604 | 11,851 | 11,698 | 12,035 | 12,424 | 12,512 | 12,863 | 12,853 | 12,732 | 12,760 | 12,874 | 12,951 | 12,855 | 12,819 | 12,749 | 12,628 | 12,544 | 12,775 | 12,677 | 12,578 | 12,345 | 12,390 | 12,399 | 12,467 | 12,246 | 12,074 | 11,676 | 11,899 | 12,456 | 12,237 | 11,984 | 11,943 | 11,925 | 11,932 | 12,042 | 11,813 | 11,714 | 11,672 | 11,491 | 11,436 | 11,254 | 11,163 | 11,108 | 11,020 | 10,931 | 10,991 | 11,049 | 11,039 | 10,993 | 10,968 | 10,822 | 10,846 | 10,813 | 10,825 | 10,915 | 10,839 | 10,873 | 10,908 | 10,907 | 10,820 | 10,733 | 10,766 | 10,614 | 10,538 | 10,505 | 10,461 | 10,427 | 10,310 | 10,672 | 10,767 | 10,798 | 10,734 | 10,785 | 10,573 | 10,520 | 10,393 | 10,297 | 10,356 | 10,252 | 10,126 | 10,052 | 9,999 | 9,936 | 9,873 | 9,811 | 9,839 | 9,857 | 9,915 | 9,873 | 10,020 | 9,829 | 9,728 | 9,736 | 9,675 |
| C000013125 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,550 | 12,214 | 12,158 | 12,076 | 11,901 | 11,871 | 12,022 | 12,031 | 12,039 | 12,035 | 11,711 | 10,914 | 11,139 | 11,503 | 11,665 | 11,637 | 11,521 | 11,607 | 11,579 | 11,364 | 11,659 | 11,259 | 11,331 | 10,721 | 10,856 | 11,301 | 11,587 | 11,321 | 11,568 | 11,426 | 11,762 | 12,150 | 12,243 | 12,595 | 12,581 | 12,482 | 12,518 | 12,637 | 12,721 | 12,635 | 12,608 | 12,546 | 12,435 | 12,361 | 12,596 | 12,507 | 12,417 | 12,194 | 12,247 | 12,263 | 12,338 | 12,127 | 11,964 | 11,576 | 11,805 | 12,365 | 12,155 | 11,911 | 11,878 | 11,867 | 11,881 | 11,998 | 11,777 | 11,685 | 11,651 | 11,477 | 11,430 | 11,254 | 11,170 | 11,122 | 11,040 | 10,958 | 11,025 | 11,090 | 11,088 | 11,048 | 11,030 | 10,890 | 10,920 | 10,895 | 10,913 | 11,010 | 10,941 | 10,982 | 11,024 | 11,031 | 10,949 | 10,868 | 10,908 | 10,761 | 10,690 | 10,663 | 10,625 | 10,598 | 10,485 | 10,859 | 10,963 | 11,002 | 10,944 | 11,003 | 10,793 | 10,745 | 10,622 | 10,531 | 10,598 | 10,497 | 10,375 | 10,305 | 10,258 | 10,199 | 10,142 | 10,073 | 10,119 | 10,144 | 10,210 | 10,173 | 10,330 | 10,140 | 10,042 | 10,057 | 10,000 |
| C000013126 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,364,260 | 1,346,695 | 1,339,376 | 1,329,161 | 1,308,914 | 1,304,493 | 1,319,952 | 1,319,846 | 1,319,660 | 1,318,126 | 1,281,513 | 1,192,014 | 1,216,921 | 1,255,653 | 1,272,235 | 1,268,176 | 1,254,498 | 1,261,383 | 1,258,679 | 1,234,259 | 1,265,379 | 1,220,866 | 1,227,632 | 1,160,617 | 1,174,230 | 1,221,347 | 1,251,212 | 1,221,371 | 1,247,080 | 1,230,746 | 1,265,880 | 1,306,488 | 1,315,493 | 1,352,123 | 1,349,511 | 1,337,810 | 1,340,459 | 1,352,139 | 1,359,934 | 1,349,591 | 1,345,551 | 1,337,866 | 1,324,945 | 1,315,886 | 1,339,845 | 1,329,281 | 1,318,649 | 1,293,906 | 1,298,384 | 1,299,052 | 1,305,906 | 1,282,521 | 1,264,246 | 1,222,262 | 1,245,356 | 1,303,362 | 1,280,226 | 1,253,480 | 1,248,959 | 1,246,829 | 1,247,308 | 1,258,645 | 1,234,465 | 1,223,834 | 1,219,234 | 1,200,072 | 1,194,146 | 1,174,852 | 1,165,176 | 1,159,202 | 1,149,692 | 1,140,184 | 1,146,175 | 1,151,988 | 1,150,801 | 1,145,730 | 1,142,907 | 1,127,420 | 1,129,665 | 1,126,047 | 1,127,040 | 1,136,141 | 1,128,028 | 1,131,377 | 1,134,694 | 1,134,445 | 1,125,117 | 1,115,809 | 1,118,985 | 1,102,982 | 1,094,871 | 1,091,194 | 1,086,398 | 1,082,732 | 1,070,332 | 1,107,609 | 1,117,225 | 1,120,238 | 1,113,412 | 1,118,468 | 1,096,259 | 1,090,460 | 1,077,114 | 1,066,957 | 1,072,893 | 1,061,805 | 1,048,558 | 1,040,681 | 1,034,978 | 1,028,228 | 1,021,579 | 1,014,900 | 1,017,607 | 1,019,257 | 1,025,034 | 1,020,453 | 1,035,468 | 1,015,498 | 1,004,890 | 1,005,503 | 1,000,000 |
| C000013130 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class A with Maximum Sales Charge | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,359 | 12,217 | 12,143 | 12,056 | 11,842 | 11,834 | 11,965 | 11,983 | 12,013 | 12,031 | 11,683 | 10,759 | 10,978 | 11,372 | 11,554 | 11,524 | 11,409 | 11,492 | 11,476 | 11,227 | 11,517 | 11,123 | 11,158 | 10,572 | 10,682 | 11,107 | 11,400 | 11,076 | 11,308 | 11,133 | 11,499 | 11,925 | 12,014 | 12,392 | 12,371 | 12,260 | 12,291 | 12,417 | 12,496 | 12,398 | 12,348 | 12,286 | 12,154 | 12,070 | 12,322 | 12,212 | 12,116 | 11,871 | 11,899 | 11,937 | 12,030 | 11,817 | 11,705 | 11,300 | 11,581 | 12,042 | 11,817 | 11,572 | 11,527 | 11,516 | 11,540 | 11,652 | 11,442 | 11,343 | 11,308 | 11,152 | 11,083 | 10,905 | 10,824 | 10,755 | 10,643 | 10,541 | 10,613 | 10,673 | 10,670 | 10,644 | 10,640 | 10,540 | 10,579 | 10,544 | 10,593 | 10,716 | 10,596 | 10,655 | 10,640 | 10,656 | 10,588 | 10,520 | 10,557 | 10,385 | 10,317 | 10,291 | 10,230 | 10,203 | 10,074 | 10,497 | 10,605 | 10,671 | 10,645 | 10,680 | 10,471 | 10,424 | 10,337 | 10,270 | 10,293 | 10,165 | 10,057 | 10,008 | 9,959 | 9,901 | 9,872 | 9,814 | 9,815 | 9,844 | 9,883 | 9,853 | 9,958 | 9,784 | 9,706 | 9,715 | 9,675 |
| C000013132 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,045 | 11,737 | 11,673 | 11,584 | 11,398 | 11,397 | 11,519 | 11,543 | 11,579 | 11,603 | 11,275 | 10,401 | 10,608 | 10,995 | 11,190 | 11,169 | 11,052 | 11,139 | 11,131 | 10,908 | 11,196 | 10,821 | 10,861 | 10,286 | 10,411 | 10,821 | 11,113 | 10,816 | 11,049 | 10,884 | 11,237 | 11,673 | 11,755 | 12,144 | 12,132 | 12,018 | 12,056 | 12,187 | 12,273 | 12,197 | 12,154 | 12,090 | 11,968 | 11,903 | 12,147 | 12,047 | 11,971 | 11,724 | 11,760 | 11,816 | 11,904 | 11,712 | 11,596 | 11,202 | 11,499 | 11,952 | 11,736 | 11,500 | 11,474 | 11,459 | 11,501 | 11,608 | 11,406 | 11,314 | 11,298 | 11,138 | 11,088 | 10,905 | 10,842 | 10,769 | 10,663 | 10,567 | 10,646 | 10,724 | 10,716 | 10,708 | 10,711 | 10,606 | 10,652 | 10,623 | 10,679 | 10,810 | 10,696 | 10,762 | 10,764 | 10,776 | 10,714 | 10,663 | 10,696 | 10,539 | 10,477 | 10,446 | 10,390 | 10,380 | 10,255 | 10,682 | 10,798 | 10,883 | 10,853 | 10,895 | 10,699 | 10,658 | 10,565 | 10,503 | 10,533 | 10,419 | 10,305 | 10,260 | 10,217 | 10,173 | 10,141 | 10,087 | 10,104 | 10,131 | 10,187 | 10,162 | 10,267 | 10,093 | 10,030 | 10,044 | 10,000 |
| C000063949 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,302,929 | 1,287,941 | 1,279,927 | 1,270,501 | 1,247,778 | 1,246,671 | 1,260,323 | 1,260,635 | 1,263,599 | 1,266,603 | 1,229,764 | 1,132,324 | 1,155,175 | 1,195,096 | 1,215,325 | 1,212,054 | 1,199,686 | 1,208,207 | 1,206,337 | 1,179,956 | 1,210,333 | 1,168,716 | 1,172,150 | 1,110,442 | 1,121,782 | 1,166,269 | 1,196,772 | 1,162,602 | 1,186,755 | 1,168,129 | 1,205,072 | 1,250,836 | 1,259,951 | 1,299,379 | 1,297,029 | 1,285,122 | 1,286,935 | 1,299,875 | 1,307,948 | 1,298,770 | 1,293,251 | 1,285,357 | 1,272,562 | 1,263,466 | 1,288,433 | 1,278,014 | 1,267,691 | 1,240,635 | 1,244,555 | 1,248,371 | 1,256,714 | 1,235,461 | 1,223,529 | 1,181,032 | 1,210,211 | 1,256,953 | 1,234,490 | 1,208,640 | 1,203,798 | 1,201,309 | 1,204,749 | 1,216,188 | 1,194,097 | 1,183,527 | 1,179,713 | 1,162,119 | 1,155,945 | 1,136,023 | 1,128,548 | 1,121,179 | 1,109,245 | 1,097,327 | 1,105,755 | 1,111,899 | 1,111,324 | 1,108,471 | 1,107,880 | 1,097,272 | 1,101,175 | 1,097,284 | 1,102,207 | 1,114,888 | 1,102,207 | 1,108,163 | 1,106,385 | 1,107,874 | 1,100,637 | 1,093,396 | 1,096,985 | 1,078,958 | 1,071,732 | 1,068,834 | 1,062,329 | 1,059,349 | 1,045,784 | 1,089,522 | 1,100,496 | 1,107,195 | 1,104,323 | 1,106,664 | 1,085,874 | 1,080,859 | 1,071,659 | 1,064,527 | 1,066,725 | 1,053,326 | 1,041,959 | 1,035,624 | 1,031,417 | 1,025,221 | 1,022,118 | 1,014,920 | 1,015,794 | 1,017,649 | 1,022,498 | 1,019,237 | 1,029,936 | 1,011,757 | 1,003,551 | 1,004,261 | 1,000,000 |
| C000013139 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class A with Maximum Sales Charge | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,158 | 12,026 | 11,935 | 11,858 | 11,669 | 11,707 | 11,831 | 11,857 | 11,855 | 11,867 | 11,599 | 10,884 | 11,050 | 11,368 | 11,520 | 11,492 | 11,381 | 11,519 | 11,519 | 11,314 | 11,573 | 11,259 | 11,260 | 10,785 | 10,853 | 11,247 | 11,491 | 11,223 | 11,425 | 11,291 | 11,586 | 11,920 | 11,960 | 12,280 | 12,267 | 12,176 | 12,203 | 12,296 | 12,337 | 12,259 | 12,220 | 12,181 | 12,090 | 11,999 | 12,217 | 12,166 | 12,114 | 11,945 | 11,969 | 11,967 | 12,016 | 11,836 | 11,795 | 11,384 | 11,531 | 11,883 | 11,743 | 11,541 | 11,514 | 11,499 | 11,497 | 11,581 | 11,405 | 11,316 | 11,276 | 11,125 | 11,084 | 10,908 | 10,831 | 10,730 | 10,592 | 10,442 | 10,536 | 10,617 | 10,603 | 10,564 | 10,572 | 10,450 | 10,470 | 10,431 | 10,474 | 10,637 | 10,503 | 10,555 | 10,584 | 10,588 | 10,534 | 10,469 | 10,520 | 10,351 | 10,264 | 10,234 | 10,193 | 10,176 | 10,044 | 10,436 | 10,542 | 10,592 | 10,529 | 10,567 | 10,391 | 10,361 | 10,286 | 10,222 | 10,247 | 10,128 | 10,043 | 9,958 | 9,915 | 9,851 | 9,830 | 9,777 | 9,800 | 9,834 | 9,878 | 9,859 | 9,946 | 9,787 | 9,725 | 9,758 | 9,675 |
| C000013141 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 11,836 | 11,552 | 11,472 | 11,392 | 11,230 | 11,274 | 11,387 | 11,420 | 11,424 | 11,443 | 11,191 | 10,521 | 10,688 | 11,002 | 11,156 | 11,136 | 11,035 | 11,163 | 11,183 | 10,978 | 11,249 | 10,952 | 10,959 | 10,490 | 10,564 | 10,954 | 11,212 | 10,957 | 11,161 | 11,038 | 11,333 | 11,654 | 11,713 | 12,034 | 12,030 | 11,947 | 11,982 | 12,081 | 12,128 | 12,047 | 12,016 | 11,998 | 11,902 | 11,833 | 12,043 | 12,000 | 11,956 | 11,809 | 11,841 | 11,846 | 11,902 | 11,731 | 11,685 | 11,284 | 11,437 | 11,807 | 11,674 | 11,481 | 11,449 | 11,441 | 11,446 | 11,537 | 11,381 | 11,299 | 11,254 | 11,110 | 11,088 | 10,920 | 10,836 | 10,754 | 10,623 | 10,479 | 10,579 | 10,656 | 10,648 | 10,615 | 10,631 | 10,526 | 10,553 | 10,508 | 10,558 | 10,741 | 10,612 | 10,660 | 10,696 | 10,707 | 10,659 | 10,612 | 10,658 | 10,505 | 10,423 | 10,388 | 10,352 | 10,353 | 10,226 | 10,630 | 10,746 | 10,792 | 10,734 | 10,791 | 10,607 | 10,595 | 10,524 | 10,454 | 10,497 | 10,382 | 10,290 | 10,209 | 10,183 | 10,111 | 10,097 | 10,049 | 10,079 | 10,120 | 10,183 | 10,159 | 10,254 | 10,097 | 10,039 | 10,080 | 10,000 |
| C000092721 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,282,142 | 1,269,342 | 1,259,514 | 1,249,727 | 1,231,055 | 1,234,903 | 1,246,236 | 1,248,815 | 1,248,349 | 1,249,397 | 1,220,986 | 1,147,043 | 1,164,271 | 1,197,536 | 1,213,310 | 1,210,150 | 1,198,270 | 1,211,141 | 1,212,369 | 1,189,164 | 1,217,627 | 1,184,508 | 1,184,364 | 1,132,895 | 1,139,861 | 1,180,997 | 1,207,803 | 1,179,471 | 1,199,052 | 1,186,274 | 1,216,950 | 1,250,415 | 1,255,795 | 1,289,118 | 1,287,593 | 1,277,764 | 1,280,430 | 1,289,975 | 1,294,013 | 1,284,272 | 1,279,966 | 1,277,039 | 1,265,900 | 1,257,496 | 1,278,849 | 1,273,236 | 1,267,558 | 1,251,045 | 1,253,369 | 1,252,891 | 1,257,817 | 1,238,746 | 1,232,992 | 1,189,799 | 1,204,949 | 1,242,851 | 1,227,999 | 1,206,678 | 1,202,345 | 1,200,620 | 1,200,178 | 1,208,791 | 1,191,503 | 1,181,976 | 1,176,323 | 1,160,355 | 1,157,200 | 1,138,700 | 1,129,178 | 1,119,728 | 1,105,153 | 1,089,370 | 1,098,936 | 1,105,983 | 1,104,261 | 1,099,986 | 1,101,978 | 1,089,019 | 1,090,963 | 1,085,455 | 1,089,785 | 1,107,746 | 1,093,614 | 1,098,856 | 1,100,433 | 1,100,728 | 1,094,963 | 1,089,209 | 1,094,305 | 1,076,603 | 1,067,337 | 1,062,890 | 1,058,440 | 1,057,668 | 1,043,861 | 1,084,272 | 1,095,182 | 1,100,163 | 1,092,252 | 1,097,144 | 1,077,593 | 1,075,448 | 1,067,460 | 1,060,640 | 1,063,055 | 1,050,606 | 1,040,476 | 1,031,428 | 1,028,002 | 1,019,996 | 1,017,707 | 1,013,169 | 1,015,406 | 1,017,625 | 1,023,155 | 1,019,836 | 1,029,762 | 1,012,115 | 1,005,507 | 1,008,793 | 1,000,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,821 | 12,696 | 12,596 | 12,482 | 12,294 | 12,330 | 12,485 | 12,485 | 12,469 | 12,533 | 12,249 | 11,517 | 11,616 | 11,967 | 12,142 | 12,094 | 11,974 | 12,079 | 12,106 | 11,844 | 12,118 | 11,779 | 11,746 | 11,221 | 11,315 | 11,766 | 12,030 | 11,720 | 11,916 | 11,741 | 12,075 | 12,480 | 12,525 | 12,877 | 12,856 | 12,748 | 12,785 | 12,878 | 12,926 | 12,819 | 12,784 | 12,746 | 12,640 | 12,563 | 12,765 | 12,685 | 12,608 | 12,420 | 12,458 | 12,455 | 12,514 | 12,307 | 12,206 | 11,830 | 11,980 | 12,431 | 12,273 | 12,056 | 12,019 | 11,989 | 11,968 | 12,065 | 11,877 | 11,782 | 11,739 | 11,579 | 11,536 | 11,357 | 11,296 | 11,211 | 11,079 | 10,957 | 11,025 | 11,097 | 11,069 | 11,042 | 11,033 | 10,908 | 10,947 | 10,906 | 10,939 | 11,069 | 10,955 | 11,014 | 10,987 | 11,043 | 10,960 | 10,872 | 10,911 | 10,741 | 10,663 | 10,640 | 10,567 | 10,497 | 10,376 | 10,778 | 10,892 | 10,947 | 10,932 | 10,925 | 10,754 | 10,725 | 10,647 | 10,613 | 10,596 | 10,472 | 10,398 | 10,357 | 10,316 | 10,242 | 10,222 | 10,148 | 10,158 | 10,186 | 10,240 | 10,210 | 10,317 | 10,137 | 10,086 | 10,069 | 10,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,821 | 12,696 | 12,596 | 12,482 | 12,294 | 12,330 | 12,485 | 12,485 | 12,469 | 12,533 | 12,249 | 11,517 | 11,616 | 11,967 | 12,142 | 12,094 | 11,974 | 12,079 | 12,106 | 11,844 | 12,118 | 11,779 | 11,746 | 11,221 | 11,315 | 11,766 | 12,030 | 11,720 | 11,916 | 11,741 | 12,075 | 12,480 | 12,525 | 12,877 | 12,856 | 12,748 | 12,785 | 12,878 | 12,926 | 12,819 | 12,784 | 12,746 | 12,640 | 12,563 | 12,765 | 12,685 | 12,608 | 12,420 | 12,458 | 12,455 | 12,514 | 12,307 | 12,206 | 11,830 | 11,980 | 12,431 | 12,273 | 12,056 | 12,019 | 11,989 | 11,968 | 12,065 | 11,877 | 11,782 | 11,739 | 11,579 | 11,536 | 11,357 | 11,296 | 11,211 | 11,079 | 10,957 | 11,025 | 11,097 | 11,069 | 11,042 | 11,033 | 10,908 | 10,947 | 10,906 | 10,939 | 11,069 | 10,955 | 11,014 | 10,987 | 11,043 | 10,960 | 10,872 | 10,911 | 10,741 | 10,663 | 10,640 | 10,567 | 10,497 | 10,376 | 10,778 | 10,892 | 10,947 | 10,932 | 10,925 | 10,754 | 10,725 | 10,647 | 10,613 | 10,596 | 10,472 | 10,398 | 10,357 | 10,316 | 10,242 | 10,222 | 10,148 | 10,158 | 10,186 | 10,240 | 10,210 | 10,317 | 10,137 | 10,086 | 10,069 | 10,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,282,104 | 1,269,557 | 1,259,622 | 1,248,245 | 1,229,401 | 1,233,018 | 1,248,480 | 1,248,519 | 1,246,918 | 1,253,319 | 1,224,851 | 1,151,737 | 1,161,622 | 1,196,696 | 1,214,176 | 1,209,391 | 1,197,397 | 1,207,864 | 1,210,629 | 1,184,351 | 1,211,751 | 1,177,916 | 1,174,553 | 1,122,070 | 1,131,480 | 1,176,640 | 1,203,006 | 1,172,038 | 1,191,554 | 1,174,113 | 1,207,512 | 1,247,967 | 1,252,454 | 1,287,702 | 1,285,628 | 1,274,776 | 1,278,514 | 1,287,808 | 1,292,552 | 1,281,920 | 1,278,410 | 1,274,607 | 1,264,005 | 1,256,257 | 1,276,540 | 1,268,456 | 1,260,776 | 1,242,033 | 1,245,775 | 1,245,511 | 1,251,382 | 1,230,655 | 1,220,609 | 1,182,977 | 1,198,012 | 1,243,103 | 1,227,277 | 1,205,616 | 1,201,946 | 1,198,948 | 1,196,803 | 1,206,474 | 1,187,739 | 1,178,244 | 1,173,909 | 1,157,945 | 1,153,610 | 1,135,658 | 1,129,609 | 1,121,135 | 1,107,870 | 1,095,742 | 1,102,531 | 1,109,715 | 1,106,873 | 1,104,193 | 1,103,252 | 1,090,761 | 1,094,668 | 1,090,642 | 1,093,911 | 1,106,943 | 1,095,493 | 1,101,390 | 1,098,708 | 1,104,323 | 1,095,983 | 1,087,187 | 1,091,100 | 1,074,054 | 1,066,317 | 1,064,007 | 1,056,669 | 1,049,749 | 1,037,568 | 1,077,763 | 1,089,190 | 1,094,653 | 1,093,178 | 1,092,511 | 1,075,403 | 1,072,502 | 1,064,674 | 1,061,312 | 1,059,645 | 1,047,151 | 1,039,845 | 1,035,727 | 1,031,626 | 1,024,207 | 1,022,199 | 1,014,848 | 1,015,774 | 1,018,588 | 1,023,960 | 1,021,012 | 1,031,654 | 1,013,687 | 1,008,598 | 1,006,857 | 1,000,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,821 | 12,696 | 12,596 | 12,482 | 12,294 | 12,330 | 12,485 | 12,485 | 12,469 | 12,533 | 12,249 | 11,517 | 11,616 | 11,967 | 12,142 | 12,094 | 11,974 | 12,079 | 12,106 | 11,844 | 12,118 | 11,779 | 11,746 | 11,221 | 11,315 | 11,766 | 12,030 | 11,720 | 11,916 | 11,741 | 12,075 | 12,480 | 12,525 | 12,877 | 12,856 | 12,748 | 12,785 | 12,878 | 12,926 | 12,819 | 12,784 | 12,746 | 12,640 | 12,563 | 12,765 | 12,685 | 12,608 | 12,420 | 12,458 | 12,455 | 12,514 | 12,307 | 12,206 | 11,830 | 11,980 | 12,431 | 12,273 | 12,056 | 12,019 | 11,989 | 11,968 | 12,065 | 11,877 | 11,782 | 11,739 | 11,579 | 11,536 | 11,357 | 11,296 | 11,211 | 11,079 | 10,957 | 11,025 | 11,097 | 11,069 | 11,042 | 11,033 | 10,908 | 10,947 | 10,906 | 10,939 | 11,069 | 10,955 | 11,014 | 10,987 | 11,043 | 10,960 | 10,872 | 10,911 | 10,741 | 10,663 | 10,640 | 10,567 | 10,497 | 10,376 | 10,778 | 10,892 | 10,947 | 10,932 | 10,925 | 10,754 | 10,725 | 10,647 | 10,613 | 10,596 | 10,472 | 10,398 | 10,357 | 10,316 | 10,242 | 10,222 | 10,148 | 10,158 | 10,186 | 10,240 | 10,210 | 10,317 | 10,137 | 10,086 | 10,069 | 10,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,821 | 12,696 | 12,596 | 12,482 | 12,294 | 12,330 | 12,485 | 12,485 | 12,469 | 12,533 | 12,249 | 11,517 | 11,616 | 11,967 | 12,142 | 12,094 | 11,974 | 12,079 | 12,106 | 11,844 | 12,118 | 11,779 | 11,746 | 11,221 | 11,315 | 11,766 | 12,030 | 11,720 | 11,916 | 11,741 | 12,075 | 12,480 | 12,525 | 12,877 | 12,856 | 12,748 | 12,785 | 12,878 | 12,926 | 12,819 | 12,784 | 12,746 | 12,640 | 12,563 | 12,765 | 12,685 | 12,608 | 12,420 | 12,458 | 12,455 | 12,514 | 12,307 | 12,206 | 11,830 | 11,980 | 12,431 | 12,273 | 12,056 | 12,019 | 11,989 | 11,968 | 12,065 | 11,877 | 11,782 | 11,739 | 11,579 | 11,536 | 11,357 | 11,296 | 11,211 | 11,079 | 10,957 | 11,025 | 11,097 | 11,069 | 11,042 | 11,033 | 10,908 | 10,947 | 10,906 | 10,939 | 11,069 | 10,955 | 11,014 | 10,987 | 11,043 | 10,960 | 10,872 | 10,911 | 10,741 | 10,663 | 10,640 | 10,567 | 10,497 | 10,376 | 10,778 | 10,892 | 10,947 | 10,932 | 10,925 | 10,754 | 10,725 | 10,647 | 10,613 | 10,596 | 10,472 | 10,398 | 10,357 | 10,316 | 10,242 | 10,222 | 10,148 | 10,158 | 10,186 | 10,240 | 10,210 | 10,317 | 10,137 | 10,086 | 10,069 | 10,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,282,104 | 1,269,557 | 1,259,622 | 1,248,245 | 1,229,401 | 1,233,018 | 1,248,480 | 1,248,519 | 1,246,918 | 1,253,319 | 1,224,851 | 1,151,737 | 1,161,622 | 1,196,696 | 1,214,176 | 1,209,391 | 1,197,397 | 1,207,864 | 1,210,629 | 1,184,351 | 1,211,751 | 1,177,916 | 1,174,553 | 1,122,070 | 1,131,480 | 1,176,640 | 1,203,006 | 1,172,038 | 1,191,554 | 1,174,113 | 1,207,512 | 1,247,967 | 1,252,454 | 1,287,702 | 1,285,628 | 1,274,776 | 1,278,514 | 1,287,808 | 1,292,552 | 1,281,920 | 1,278,410 | 1,274,607 | 1,264,005 | 1,256,257 | 1,276,540 | 1,268,456 | 1,260,776 | 1,242,033 | 1,245,775 | 1,245,511 | 1,251,382 | 1,230,655 | 1,220,609 | 1,182,977 | 1,198,012 | 1,243,103 | 1,227,277 | 1,205,616 | 1,201,946 | 1,198,948 | 1,196,803 | 1,206,474 | 1,187,739 | 1,178,244 | 1,173,909 | 1,157,945 | 1,153,610 | 1,135,658 | 1,129,609 | 1,121,135 | 1,107,870 | 1,095,742 | 1,102,531 | 1,109,715 | 1,106,873 | 1,104,193 | 1,103,252 | 1,090,761 | 1,094,668 | 1,090,642 | 1,093,911 | 1,106,943 | 1,095,493 | 1,101,390 | 1,098,708 | 1,104,323 | 1,095,983 | 1,087,187 | 1,091,100 | 1,074,054 | 1,066,317 | 1,064,007 | 1,056,669 | 1,049,749 | 1,037,568 | 1,077,763 | 1,089,190 | 1,094,653 | 1,093,178 | 1,092,511 | 1,075,403 | 1,072,502 | 1,064,674 | 1,061,312 | 1,059,645 | 1,047,151 | 1,039,845 | 1,035,727 | 1,031,626 | 1,024,207 | 1,022,199 | 1,014,848 | 1,015,774 | 1,018,588 | 1,023,960 | 1,021,012 | 1,031,654 | 1,013,687 | 1,008,598 | 1,006,857 | 1,000,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,821 | 12,696 | 12,596 | 12,482 | 12,294 | 12,330 | 12,485 | 12,485 | 12,469 | 12,533 | 12,249 | 11,517 | 11,616 | 11,967 | 12,142 | 12,094 | 11,974 | 12,079 | 12,106 | 11,844 | 12,118 | 11,779 | 11,746 | 11,221 | 11,315 | 11,766 | 12,030 | 11,720 | 11,916 | 11,741 | 12,075 | 12,480 | 12,525 | 12,877 | 12,856 | 12,748 | 12,785 | 12,878 | 12,926 | 12,819 | 12,784 | 12,746 | 12,640 | 12,563 | 12,765 | 12,685 | 12,608 | 12,420 | 12,458 | 12,455 | 12,514 | 12,307 | 12,206 | 11,830 | 11,980 | 12,431 | 12,273 | 12,056 | 12,019 | 11,989 | 11,968 | 12,065 | 11,877 | 11,782 | 11,739 | 11,579 | 11,536 | 11,357 | 11,296 | 11,211 | 11,079 | 10,957 | 11,025 | 11,097 | 11,069 | 11,042 | 11,033 | 10,908 | 10,947 | 10,906 | 10,939 | 11,069 | 10,955 | 11,014 | 10,987 | 11,043 | 10,960 | 10,872 | 10,911 | 10,741 | 10,663 | 10,640 | 10,567 | 10,497 | 10,376 | 10,778 | 10,892 | 10,947 | 10,932 | 10,925 | 10,754 | 10,725 | 10,647 | 10,613 | 10,596 | 10,472 | 10,398 | 10,357 | 10,316 | 10,242 | 10,222 | 10,148 | 10,158 | 10,186 | 10,240 | 10,210 | 10,317 | 10,137 | 10,086 | 10,069 | 10,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,821 | 12,696 | 12,596 | 12,482 | 12,294 | 12,330 | 12,485 | 12,485 | 12,469 | 12,533 | 12,249 | 11,517 | 11,616 | 11,967 | 12,142 | 12,094 | 11,974 | 12,079 | 12,106 | 11,844 | 12,118 | 11,779 | 11,746 | 11,221 | 11,315 | 11,766 | 12,030 | 11,720 | 11,916 | 11,741 | 12,075 | 12,480 | 12,525 | 12,877 | 12,856 | 12,748 | 12,785 | 12,878 | 12,926 | 12,819 | 12,784 | 12,746 | 12,640 | 12,563 | 12,765 | 12,685 | 12,608 | 12,420 | 12,458 | 12,455 | 12,514 | 12,307 | 12,206 | 11,830 | 11,980 | 12,431 | 12,273 | 12,056 | 12,019 | 11,989 | 11,968 | 12,065 | 11,877 | 11,782 | 11,739 | 11,579 | 11,536 | 11,357 | 11,296 | 11,211 | 11,079 | 10,957 | 11,025 | 11,097 | 11,069 | 11,042 | 11,033 | 10,908 | 10,947 | 10,906 | 10,939 | 11,069 | 10,955 | 11,014 | 10,987 | 11,043 | 10,960 | 10,872 | 10,911 | 10,741 | 10,663 | 10,640 | 10,567 | 10,497 | 10,376 | 10,778 | 10,892 | 10,947 | 10,932 | 10,925 | 10,754 | 10,725 | 10,647 | 10,613 | 10,596 | 10,472 | 10,398 | 10,357 | 10,316 | 10,242 | 10,222 | 10,148 | 10,158 | 10,186 | 10,240 | 10,210 | 10,317 | 10,137 | 10,086 | 10,069 | 10,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,282,104 | 1,269,557 | 1,259,622 | 1,248,245 | 1,229,401 | 1,233,018 | 1,248,480 | 1,248,519 | 1,246,918 | 1,253,319 | 1,224,851 | 1,151,737 | 1,161,622 | 1,196,696 | 1,214,176 | 1,209,391 | 1,197,397 | 1,207,864 | 1,210,629 | 1,184,351 | 1,211,751 | 1,177,916 | 1,174,553 | 1,122,070 | 1,131,480 | 1,176,640 | 1,203,006 | 1,172,038 | 1,191,554 | 1,174,113 | 1,207,512 | 1,247,967 | 1,252,454 | 1,287,702 | 1,285,628 | 1,274,776 | 1,278,514 | 1,287,808 | 1,292,552 | 1,281,920 | 1,278,410 | 1,274,607 | 1,264,005 | 1,256,257 | 1,276,540 | 1,268,456 | 1,260,776 | 1,242,033 | 1,245,775 | 1,245,511 | 1,251,382 | 1,230,655 | 1,220,609 | 1,182,977 | 1,198,012 | 1,243,103 | 1,227,277 | 1,205,616 | 1,201,946 | 1,198,948 | 1,196,803 | 1,206,474 | 1,187,739 | 1,178,244 | 1,173,909 | 1,157,945 | 1,153,610 | 1,135,658 | 1,129,609 | 1,121,135 | 1,107,870 | 1,095,742 | 1,102,531 | 1,109,715 | 1,106,873 | 1,104,193 | 1,103,252 | 1,090,761 | 1,094,668 | 1,090,642 | 1,093,911 | 1,106,943 | 1,095,493 | 1,101,390 | 1,098,708 | 1,104,323 | 1,095,983 | 1,087,187 | 1,091,100 | 1,074,054 | 1,066,317 | 1,064,007 | 1,056,669 | 1,049,749 | 1,037,568 | 1,077,763 | 1,089,190 | 1,094,653 | 1,093,178 | 1,092,511 | 1,075,403 | 1,072,502 | 1,064,674 | 1,061,312 | 1,059,645 | 1,047,151 | 1,039,845 | 1,035,727 | 1,031,626 | 1,024,207 | 1,022,199 | 1,014,848 | 1,015,774 | 1,018,588 | 1,023,960 | 1,021,012 | 1,031,654 | 1,013,687 | 1,008,598 | 1,006,857 | 1,000,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,821 | 12,696 | 12,596 | 12,482 | 12,294 | 12,330 | 12,485 | 12,485 | 12,469 | 12,533 | 12,249 | 11,517 | 11,616 | 11,967 | 12,142 | 12,094 | 11,974 | 12,079 | 12,106 | 11,844 | 12,118 | 11,779 | 11,746 | 11,221 | 11,315 | 11,766 | 12,030 | 11,720 | 11,916 | 11,741 | 12,075 | 12,480 | 12,525 | 12,877 | 12,856 | 12,748 | 12,785 | 12,878 | 12,926 | 12,819 | 12,784 | 12,746 | 12,640 | 12,563 | 12,765 | 12,685 | 12,608 | 12,420 | 12,458 | 12,455 | 12,514 | 12,307 | 12,206 | 11,830 | 11,980 | 12,431 | 12,273 | 12,056 | 12,019 | 11,989 | 11,968 | 12,065 | 11,877 | 11,782 | 11,739 | 11,579 | 11,536 | 11,357 | 11,296 | 11,211 | 11,079 | 10,957 | 11,025 | 11,097 | 11,069 | 11,042 | 11,033 | 10,908 | 10,947 | 10,906 | 10,939 | 11,069 | 10,955 | 11,014 | 10,987 | 11,043 | 10,960 | 10,872 | 10,911 | 10,741 | 10,663 | 10,640 | 10,567 | 10,497 | 10,376 | 10,778 | 10,892 | 10,947 | 10,932 | 10,925 | 10,754 | 10,725 | 10,647 | 10,613 | 10,596 | 10,472 | 10,398 | 10,357 | 10,316 | 10,242 | 10,222 | 10,148 | 10,158 | 10,186 | 10,240 | 10,210 | 10,317 | 10,137 | 10,086 | 10,069 | 10,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,821 | 12,696 | 12,596 | 12,482 | 12,294 | 12,330 | 12,485 | 12,485 | 12,469 | 12,533 | 12,249 | 11,517 | 11,616 | 11,967 | 12,142 | 12,094 | 11,974 | 12,079 | 12,106 | 11,844 | 12,118 | 11,779 | 11,746 | 11,221 | 11,315 | 11,766 | 12,030 | 11,720 | 11,916 | 11,741 | 12,075 | 12,480 | 12,525 | 12,877 | 12,856 | 12,748 | 12,785 | 12,878 | 12,926 | 12,819 | 12,784 | 12,746 | 12,640 | 12,563 | 12,765 | 12,685 | 12,608 | 12,420 | 12,458 | 12,455 | 12,514 | 12,307 | 12,206 | 11,830 | 11,980 | 12,431 | 12,273 | 12,056 | 12,019 | 11,989 | 11,968 | 12,065 | 11,877 | 11,782 | 11,739 | 11,579 | 11,536 | 11,357 | 11,296 | 11,211 | 11,079 | 10,957 | 11,025 | 11,097 | 11,069 | 11,042 | 11,033 | 10,908 | 10,947 | 10,906 | 10,939 | 11,069 | 10,955 | 11,014 | 10,987 | 11,043 | 10,960 | 10,872 | 10,911 | 10,741 | 10,663 | 10,640 | 10,567 | 10,497 | 10,376 | 10,778 | 10,892 | 10,947 | 10,932 | 10,925 | 10,754 | 10,725 | 10,647 | 10,613 | 10,596 | 10,472 | 10,398 | 10,357 | 10,316 | 10,242 | 10,222 | 10,148 | 10,158 | 10,186 | 10,240 | 10,210 | 10,317 | 10,137 | 10,086 | 10,069 | 10,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,282,104 | 1,269,557 | 1,259,622 | 1,248,245 | 1,229,401 | 1,233,018 | 1,248,480 | 1,248,519 | 1,246,918 | 1,253,319 | 1,224,851 | 1,151,737 | 1,161,622 | 1,196,696 | 1,214,176 | 1,209,391 | 1,197,397 | 1,207,864 | 1,210,629 | 1,184,351 | 1,211,751 | 1,177,916 | 1,174,553 | 1,122,070 | 1,131,480 | 1,176,640 | 1,203,006 | 1,172,038 | 1,191,554 | 1,174,113 | 1,207,512 | 1,247,967 | 1,252,454 | 1,287,702 | 1,285,628 | 1,274,776 | 1,278,514 | 1,287,808 | 1,292,552 | 1,281,920 | 1,278,410 | 1,274,607 | 1,264,005 | 1,256,257 | 1,276,540 | 1,268,456 | 1,260,776 | 1,242,033 | 1,245,775 | 1,245,511 | 1,251,382 | 1,230,655 | 1,220,609 | 1,182,977 | 1,198,012 | 1,243,103 | 1,227,277 | 1,205,616 | 1,201,946 | 1,198,948 | 1,196,803 | 1,206,474 | 1,187,739 | 1,178,244 | 1,173,909 | 1,157,945 | 1,153,610 | 1,135,658 | 1,129,609 | 1,121,135 | 1,107,870 | 1,095,742 | 1,102,531 | 1,109,715 | 1,106,873 | 1,104,193 | 1,103,252 | 1,090,761 | 1,094,668 | 1,090,642 | 1,093,911 | 1,106,943 | 1,095,493 | 1,101,390 | 1,098,708 | 1,104,323 | 1,095,983 | 1,087,187 | 1,091,100 | 1,074,054 | 1,066,317 | 1,064,007 | 1,056,669 | 1,049,749 | 1,037,568 | 1,077,763 | 1,089,190 | 1,094,653 | 1,093,178 | 1,092,511 | 1,075,403 | 1,072,502 | 1,064,674 | 1,061,312 | 1,059,645 | 1,047,151 | 1,039,845 | 1,035,727 | 1,031,626 | 1,024,207 | 1,022,199 | 1,014,848 | 1,015,774 | 1,018,588 | 1,023,960 | 1,021,012 | 1,031,654 | 1,013,687 | 1,008,598 | 1,006,857 | 1,000,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,821 | 12,696 | 12,596 | 12,482 | 12,294 | 12,330 | 12,485 | 12,485 | 12,469 | 12,533 | 12,249 | 11,517 | 11,616 | 11,967 | 12,142 | 12,094 | 11,974 | 12,079 | 12,106 | 11,844 | 12,118 | 11,779 | 11,746 | 11,221 | 11,315 | 11,766 | 12,030 | 11,720 | 11,916 | 11,741 | 12,075 | 12,480 | 12,525 | 12,877 | 12,856 | 12,748 | 12,785 | 12,878 | 12,926 | 12,819 | 12,784 | 12,746 | 12,640 | 12,563 | 12,765 | 12,685 | 12,608 | 12,420 | 12,458 | 12,455 | 12,514 | 12,307 | 12,206 | 11,830 | 11,980 | 12,431 | 12,273 | 12,056 | 12,019 | 11,989 | 11,968 | 12,065 | 11,877 | 11,782 | 11,739 | 11,579 | 11,536 | 11,357 | 11,296 | 11,211 | 11,079 | 10,957 | 11,025 | 11,097 | 11,069 | 11,042 | 11,033 | 10,908 | 10,947 | 10,906 | 10,939 | 11,069 | 10,955 | 11,014 | 10,987 | 11,043 | 10,960 | 10,872 | 10,911 | 10,741 | 10,663 | 10,640 | 10,567 | 10,497 | 10,376 | 10,778 | 10,892 | 10,947 | 10,932 | 10,925 | 10,754 | 10,725 | 10,647 | 10,613 | 10,596 | 10,472 | 10,398 | 10,357 | 10,316 | 10,242 | 10,222 | 10,148 | 10,158 | 10,186 | 10,240 | 10,210 | 10,317 | 10,137 | 10,086 | 10,069 | 10,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,821 | 12,696 | 12,596 | 12,482 | 12,294 | 12,330 | 12,485 | 12,485 | 12,469 | 12,533 | 12,249 | 11,517 | 11,616 | 11,967 | 12,142 | 12,094 | 11,974 | 12,079 | 12,106 | 11,844 | 12,118 | 11,779 | 11,746 | 11,221 | 11,315 | 11,766 | 12,030 | 11,720 | 11,916 | 11,741 | 12,075 | 12,480 | 12,525 | 12,877 | 12,856 | 12,748 | 12,785 | 12,878 | 12,926 | 12,819 | 12,784 | 12,746 | 12,640 | 12,563 | 12,765 | 12,685 | 12,608 | 12,420 | 12,458 | 12,455 | 12,514 | 12,307 | 12,206 | 11,830 | 11,980 | 12,431 | 12,273 | 12,056 | 12,019 | 11,989 | 11,968 | 12,065 | 11,877 | 11,782 | 11,739 | 11,579 | 11,536 | 11,357 | 11,296 | 11,211 | 11,079 | 10,957 | 11,025 | 11,097 | 11,069 | 11,042 | 11,033 | 10,908 | 10,947 | 10,906 | 10,939 | 11,069 | 10,955 | 11,014 | 10,987 | 11,043 | 10,960 | 10,872 | 10,911 | 10,741 | 10,663 | 10,640 | 10,567 | 10,497 | 10,376 | 10,778 | 10,892 | 10,947 | 10,932 | 10,925 | 10,754 | 10,725 | 10,647 | 10,613 | 10,596 | 10,472 | 10,398 | 10,357 | 10,316 | 10,242 | 10,222 | 10,148 | 10,158 | 10,186 | 10,240 | 10,210 | 10,317 | 10,137 | 10,086 | 10,069 | 10,000 |
| EATON VANCE Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,282,104 | 1,269,557 | 1,259,622 | 1,248,245 | 1,229,401 | 1,233,018 | 1,248,480 | 1,248,519 | 1,246,918 | 1,253,319 | 1,224,851 | 1,151,737 | 1,161,622 | 1,196,696 | 1,214,176 | 1,209,391 | 1,197,397 | 1,207,864 | 1,210,629 | 1,184,351 | 1,211,751 | 1,177,916 | 1,174,553 | 1,122,070 | 1,131,480 | 1,176,640 | 1,203,006 | 1,172,038 | 1,191,554 | 1,174,113 | 1,207,512 | 1,247,967 | 1,252,454 | 1,287,702 | 1,285,628 | 1,274,776 | 1,278,514 | 1,287,808 | 1,292,552 | 1,281,920 | 1,278,410 | 1,274,607 | 1,264,005 | 1,256,257 | 1,276,540 | 1,268,456 | 1,260,776 | 1,242,033 | 1,245,775 | 1,245,511 | 1,251,382 | 1,230,655 | 1,220,609 | 1,182,977 | 1,198,012 | 1,243,103 | 1,227,277 | 1,205,616 | 1,201,946 | 1,198,948 | 1,196,803 | 1,206,474 | 1,187,739 | 1,178,244 | 1,173,909 | 1,157,945 | 1,153,610 | 1,135,658 | 1,129,609 | 1,121,135 | 1,107,870 | 1,095,742 | 1,102,531 | 1,109,715 | 1,106,873 | 1,104,193 | 1,103,252 | 1,090,761 | 1,094,668 | 1,090,642 | 1,093,911 | 1,106,943 | 1,095,493 | 1,101,390 | 1,098,708 | 1,104,323 | 1,095,983 | 1,087,187 | 1,091,100 | 1,074,054 | 1,066,317 | 1,064,007 | 1,056,669 | 1,049,749 | 1,037,568 | 1,077,763 | 1,089,190 | 1,094,653 | 1,093,178 | 1,092,511 | 1,075,403 | 1,072,502 | 1,064,674 | 1,061,312 | 1,059,645 | 1,047,151 | 1,039,845 | 1,035,727 | 1,031,626 | 1,024,207 | 1,022,199 | 1,014,848 | 1,015,774 | 1,018,588 | 1,023,960 | 1,021,012 | 1,031,654 | 1,013,687 | 1,008,598 | 1,006,857 | 1,000,000 |
| EATON VANCE Index: Bloomberg California Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg California Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,781 | 12,652 | 12,547 | 12,436 | 12,264 | 12,301 | 12,461 | 12,476 | 12,462 | 12,513 | 12,237 | 11,532 | 11,633 | 11,977 | 12,117 | 12,068 | 11,950 | 12,050 | 12,081 | 11,823 | 12,098 | 11,780 | 11,742 | 11,226 | 11,300 | 11,734 | 11,990 | 11,662 | 11,845 | 11,649 | 11,996 | 12,409 | 12,447 | 12,827 | 12,802 | 12,689 | 12,725 | 12,819 | 12,863 | 12,757 | 12,724 | 12,689 | 12,589 | 12,502 | 12,734 | 12,673 | 12,621 | 12,429 | 12,463 | 12,467 | 12,550 | 12,338 | 12,267 | 11,865 | 11,994 | 12,428 | 12,269 | 12,053 | 12,018 | 11,991 | 11,970 | 12,060 | 11,868 | 11,769 | 11,729 | 11,560 | 11,509 | 11,323 | 11,267 | 11,194 | 11,072 | 10,958 | 11,034 | 11,119 | 11,085 | 11,059 | 11,055 | 10,908 | 10,953 | 10,904 | 10,939 | 11,071 | 10,951 | 11,010 | 10,975 | 11,026 | 10,959 | 10,863 | 10,900 | 10,721 | 10,646 | 10,625 | 10,564 | 10,482 | 10,360 | 10,775 | 10,902 | 10,969 | 10,951 | 10,946 | 10,776 | 10,745 | 10,664 | 10,628 | 10,611 | 10,496 | 10,417 | 10,377 | 10,339 | 10,268 | 10,240 | 10,163 | 10,172 | 10,195 | 10,252 | 10,220 | 10,314 | 10,140 | 10,084 | 10,072 | 10,000 |
| EATON VANCE Index: Bloomberg California Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg California Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,781 | 12,652 | 12,547 | 12,436 | 12,264 | 12,301 | 12,461 | 12,476 | 12,462 | 12,513 | 12,237 | 11,532 | 11,633 | 11,977 | 12,117 | 12,068 | 11,950 | 12,050 | 12,081 | 11,823 | 12,098 | 11,780 | 11,742 | 11,226 | 11,300 | 11,734 | 11,990 | 11,662 | 11,845 | 11,649 | 11,996 | 12,409 | 12,447 | 12,827 | 12,802 | 12,689 | 12,725 | 12,819 | 12,863 | 12,757 | 12,724 | 12,689 | 12,589 | 12,502 | 12,734 | 12,673 | 12,621 | 12,429 | 12,463 | 12,467 | 12,550 | 12,338 | 12,267 | 11,865 | 11,994 | 12,428 | 12,269 | 12,053 | 12,018 | 11,991 | 11,970 | 12,060 | 11,868 | 11,769 | 11,729 | 11,560 | 11,509 | 11,323 | 11,267 | 11,194 | 11,072 | 10,958 | 11,034 | 11,119 | 11,085 | 11,059 | 11,055 | 10,908 | 10,953 | 10,904 | 10,939 | 11,071 | 10,951 | 11,010 | 10,975 | 11,026 | 10,959 | 10,863 | 10,900 | 10,721 | 10,646 | 10,625 | 10,564 | 10,482 | 10,360 | 10,775 | 10,902 | 10,969 | 10,951 | 10,946 | 10,776 | 10,745 | 10,664 | 10,628 | 10,611 | 10,496 | 10,417 | 10,377 | 10,339 | 10,268 | 10,240 | 10,163 | 10,172 | 10,195 | 10,252 | 10,220 | 10,314 | 10,140 | 10,084 | 10,072 | 10,000 |
| EATON VANCE Index: Bloomberg California Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg California Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,278,053 | 1,265,163 | 1,254,672 | 1,243,601 | 1,226,387 | 1,230,144 | 1,246,073 | 1,247,625 | 1,246,229 | 1,251,318 | 1,223,701 | 1,153,209 | 1,163,285 | 1,197,679 | 1,211,677 | 1,206,797 | 1,194,956 | 1,205,032 | 1,208,077 | 1,182,308 | 1,209,811 | 1,178,004 | 1,174,228 | 1,122,638 | 1,130,002 | 1,173,373 | 1,199,040 | 1,166,153 | 1,184,523 | 1,164,863 | 1,199,646 | 1,240,944 | 1,244,707 | 1,282,742 | 1,280,235 | 1,268,884 | 1,272,481 | 1,281,941 | 1,286,286 | 1,275,669 | 1,272,352 | 1,268,876 | 1,258,852 | 1,250,246 | 1,273,370 | 1,267,330 | 1,262,057 | 1,242,879 | 1,246,307 | 1,246,658 | 1,254,988 | 1,233,791 | 1,226,740 | 1,186,549 | 1,199,387 | 1,242,783 | 1,226,897 | 1,205,306 | 1,201,850 | 1,199,129 | 1,197,022 | 1,205,991 | 1,186,758 | 1,176,925 | 1,172,919 | 1,155,960 | 1,150,940 | 1,132,328 | 1,126,745 | 1,119,440 | 1,107,244 | 1,095,840 | 1,103,429 | 1,111,947 | 1,108,498 | 1,105,882 | 1,105,531 | 1,090,835 | 1,095,266 | 1,090,366 | 1,093,900 | 1,107,144 | 1,095,147 | 1,101,048 | 1,097,483 | 1,102,634 | 1,095,887 | 1,086,326 | 1,089,959 | 1,072,081 | 1,064,616 | 1,062,544 | 1,056,392 | 1,048,182 | 1,035,996 | 1,077,539 | 1,090,244 | 1,096,942 | 1,095,109 | 1,094,634 | 1,077,559 | 1,074,461 | 1,066,410 | 1,062,846 | 1,061,123 | 1,049,604 | 1,041,738 | 1,037,703 | 1,033,922 | 1,026,821 | 1,023,967 | 1,016,347 | 1,017,165 | 1,019,499 | 1,025,161 | 1,022,047 | 1,031,413 | 1,014,004 | 1,008,428 | 1,007,201 | 1,000,000 |
| EATON VANCE Index: Bloomberg Massachusetts Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Massachusetts Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,514 | 12,392 | 12,280 | 12,154 | 11,981 | 12,030 | 12,190 | 12,193 | 12,182 | 12,236 | 11,961 | 11,299 | 11,383 | 11,712 | 11,881 | 11,841 | 11,755 | 11,862 | 11,901 | 11,637 | 11,902 | 11,586 | 11,564 | 11,056 | 11,137 | 11,578 | 11,817 | 11,528 | 11,706 | 11,528 | 11,862 | 12,250 | 12,289 | 12,649 | 12,627 | 12,517 | 12,551 | 12,654 | 12,697 | 12,595 | 12,571 | 12,551 | 12,450 | 12,367 | 12,588 | 12,531 | 12,479 | 12,312 | 12,348 | 12,340 | 12,410 | 12,210 | 12,207 | 11,818 | 11,930 | 12,251 | 12,114 | 11,902 | 11,870 | 11,847 | 11,819 | 11,910 | 11,727 | 11,635 | 11,593 | 11,448 | 11,403 | 11,233 | 11,172 | 11,096 | 10,960 | 10,825 | 10,892 | 10,974 | 10,943 | 10,921 | 10,914 | 10,794 | 10,843 | 10,793 | 10,829 | 10,974 | 10,862 | 10,919 | 10,894 | 10,973 | 10,888 | 10,806 | 10,854 | 10,678 | 10,603 | 10,580 | 10,506 | 10,441 | 10,304 | 10,741 | 10,851 | 10,913 | 10,913 | 10,906 | 10,727 | 10,705 | 10,629 | 10,601 | 10,586 | 10,462 | 10,390 | 10,349 | 10,320 | 10,241 | 10,211 | 10,130 | 10,143 | 10,160 | 10,223 | 10,186 | 10,314 | 10,130 | 10,073 | 10,060 | 10,000 |
| EATON VANCE Index: Bloomberg Massachusetts Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Massachusetts Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,514 | 12,392 | 12,280 | 12,154 | 11,981 | 12,030 | 12,190 | 12,193 | 12,182 | 12,236 | 11,961 | 11,299 | 11,383 | 11,712 | 11,881 | 11,841 | 11,755 | 11,862 | 11,901 | 11,637 | 11,902 | 11,586 | 11,564 | 11,056 | 11,137 | 11,578 | 11,817 | 11,528 | 11,706 | 11,528 | 11,862 | 12,250 | 12,289 | 12,649 | 12,627 | 12,517 | 12,551 | 12,654 | 12,697 | 12,595 | 12,571 | 12,551 | 12,450 | 12,367 | 12,588 | 12,531 | 12,479 | 12,312 | 12,348 | 12,340 | 12,410 | 12,210 | 12,207 | 11,818 | 11,930 | 12,251 | 12,114 | 11,902 | 11,870 | 11,847 | 11,819 | 11,910 | 11,727 | 11,635 | 11,593 | 11,448 | 11,403 | 11,233 | 11,172 | 11,096 | 10,960 | 10,825 | 10,892 | 10,974 | 10,943 | 10,921 | 10,914 | 10,794 | 10,843 | 10,793 | 10,829 | 10,974 | 10,862 | 10,919 | 10,894 | 10,973 | 10,888 | 10,806 | 10,854 | 10,678 | 10,603 | 10,580 | 10,506 | 10,441 | 10,304 | 10,741 | 10,851 | 10,913 | 10,913 | 10,906 | 10,727 | 10,705 | 10,629 | 10,601 | 10,586 | 10,462 | 10,390 | 10,349 | 10,320 | 10,241 | 10,211 | 10,130 | 10,143 | 10,160 | 10,223 | 10,186 | 10,314 | 10,130 | 10,073 | 10,060 | 10,000 |
| EATON VANCE Index: Bloomberg Massachusetts Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Massachusetts Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,251,402 | 1,239,172 | 1,228,031 | 1,215,403 | 1,198,090 | 1,202,978 | 1,219,014 | 1,219,266 | 1,218,192 | 1,223,607 | 1,196,102 | 1,129,871 | 1,138,256 | 1,171,218 | 1,188,093 | 1,184,083 | 1,175,501 | 1,186,183 | 1,190,137 | 1,163,667 | 1,190,157 | 1,158,599 | 1,156,368 | 1,105,590 | 1,113,742 | 1,157,815 | 1,181,705 | 1,152,825 | 1,170,645 | 1,152,772 | 1,186,209 | 1,225,035 | 1,228,906 | 1,264,856 | 1,262,728 | 1,251,702 | 1,255,092 | 1,265,448 | 1,269,718 | 1,259,510 | 1,257,056 | 1,255,090 | 1,244,987 | 1,236,696 | 1,258,816 | 1,253,108 | 1,247,879 | 1,231,177 | 1,234,785 | 1,233,983 | 1,241,037 | 1,220,973 | 1,220,708 | 1,181,777 | 1,193,037 | 1,225,069 | 1,211,391 | 1,190,186 | 1,187,025 | 1,184,746 | 1,181,863 | 1,191,023 | 1,172,730 | 1,163,544 | 1,159,275 | 1,144,760 | 1,140,342 | 1,123,261 | 1,117,186 | 1,109,622 | 1,095,966 | 1,082,476 | 1,089,193 | 1,097,357 | 1,094,310 | 1,092,090 | 1,091,415 | 1,079,389 | 1,084,276 | 1,079,327 | 1,082,880 | 1,097,359 | 1,086,203 | 1,091,867 | 1,089,432 | 1,097,273 | 1,088,812 | 1,080,631 | 1,085,405 | 1,067,774 | 1,060,336 | 1,057,957 | 1,050,603 | 1,044,109 | 1,030,438 | 1,074,086 | 1,085,064 | 1,091,254 | 1,091,307 | 1,090,559 | 1,072,719 | 1,070,538 | 1,062,950 | 1,060,105 | 1,058,642 | 1,046,151 | 1,038,956 | 1,034,924 | 1,032,040 | 1,024,066 | 1,021,102 | 1,012,981 | 1,014,267 | 1,015,972 | 1,022,252 | 1,018,557 | 1,031,362 | 1,012,952 | 1,007,316 | 1,006,017 | 1,000,000 |
| EATON VANCE Index: Bloomberg New York Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg New York Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,700 | 12,574 | 12,486 | 12,380 | 12,168 | 12,202 | 12,352 | 12,371 | 12,371 | 12,443 | 12,144 | 11,357 | 11,454 | 11,827 | 12,019 | 11,987 | 11,843 | 11,950 | 11,968 | 11,686 | 11,974 | 11,595 | 11,569 | 11,004 | 11,108 | 11,557 | 11,852 | 11,534 | 11,786 | 11,554 | 11,901 | 12,326 | 12,372 | 12,733 | 12,707 | 12,587 | 12,616 | 12,719 | 12,785 | 12,685 | 12,643 | 12,585 | 12,450 | 12,372 | 12,585 | 12,499 | 12,394 | 12,159 | 12,199 | 12,221 | 12,313 | 12,135 | 12,029 | 11,653 | 11,857 | 12,311 | 12,164 | 11,954 | 11,921 | 11,892 | 11,877 | 11,975 | 11,806 | 11,713 | 11,677 | 11,518 | 11,479 | 11,303 | 11,242 | 11,159 | 11,029 | 10,901 | 10,970 | 11,037 | 11,016 | 10,995 | 10,989 | 10,867 | 10,912 | 10,880 | 10,914 | 11,044 | 10,935 | 10,998 | 10,971 | 11,034 | 10,962 | 10,876 | 10,915 | 10,742 | 10,665 | 10,640 | 10,574 | 10,510 | 10,384 | 10,764 | 10,881 | 10,937 | 10,925 | 10,911 | 10,755 | 10,728 | 10,643 | 10,617 | 10,602 | 10,469 | 10,405 | 10,367 | 10,329 | 10,264 | 10,237 | 10,159 | 10,163 | 10,172 | 10,224 | 10,191 | 10,303 | 10,121 | 10,079 | 10,068 | 10,000 |
| EATON VANCE Index: Bloomberg New York Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg New York Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,700 | 12,574 | 12,486 | 12,380 | 12,168 | 12,202 | 12,352 | 12,371 | 12,371 | 12,443 | 12,144 | 11,357 | 11,454 | 11,827 | 12,019 | 11,987 | 11,843 | 11,950 | 11,968 | 11,686 | 11,974 | 11,595 | 11,569 | 11,004 | 11,108 | 11,557 | 11,852 | 11,534 | 11,786 | 11,554 | 11,901 | 12,326 | 12,372 | 12,733 | 12,707 | 12,587 | 12,616 | 12,719 | 12,785 | 12,685 | 12,643 | 12,585 | 12,450 | 12,372 | 12,585 | 12,499 | 12,394 | 12,159 | 12,199 | 12,221 | 12,313 | 12,135 | 12,029 | 11,653 | 11,857 | 12,311 | 12,164 | 11,954 | 11,921 | 11,892 | 11,877 | 11,975 | 11,806 | 11,713 | 11,677 | 11,518 | 11,479 | 11,303 | 11,242 | 11,159 | 11,029 | 10,901 | 10,970 | 11,037 | 11,016 | 10,995 | 10,989 | 10,867 | 10,912 | 10,880 | 10,914 | 11,044 | 10,935 | 10,998 | 10,971 | 11,034 | 10,962 | 10,876 | 10,915 | 10,742 | 10,665 | 10,640 | 10,574 | 10,510 | 10,384 | 10,764 | 10,881 | 10,937 | 10,925 | 10,911 | 10,755 | 10,728 | 10,643 | 10,617 | 10,602 | 10,469 | 10,405 | 10,367 | 10,329 | 10,264 | 10,237 | 10,159 | 10,163 | 10,172 | 10,224 | 10,191 | 10,303 | 10,121 | 10,079 | 10,068 | 10,000 |
| EATON VANCE Index: Bloomberg New York Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg New York Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,269,981 | 1,257,437 | 1,248,625 | 1,237,954 | 1,216,799 | 1,220,237 | 1,235,166 | 1,237,082 | 1,237,110 | 1,244,312 | 1,214,380 | 1,135,660 | 1,145,389 | 1,182,678 | 1,201,854 | 1,198,736 | 1,184,323 | 1,194,953 | 1,196,778 | 1,168,585 | 1,197,429 | 1,159,484 | 1,156,876 | 1,100,387 | 1,110,801 | 1,155,670 | 1,185,161 | 1,153,419 | 1,178,599 | 1,155,397 | 1,190,050 | 1,232,583 | 1,237,249 | 1,273,252 | 1,270,680 | 1,258,682 | 1,261,635 | 1,271,851 | 1,278,464 | 1,268,465 | 1,264,306 | 1,258,468 | 1,245,038 | 1,237,232 | 1,258,524 | 1,249,904 | 1,239,442 | 1,215,869 | 1,219,913 | 1,222,067 | 1,231,318 | 1,213,495 | 1,202,853 | 1,165,275 | 1,185,683 | 1,231,106 | 1,216,358 | 1,195,367 | 1,192,131 | 1,189,150 | 1,187,724 | 1,197,510 | 1,180,573 | 1,171,316 | 1,167,699 | 1,151,819 | 1,147,859 | 1,130,316 | 1,124,203 | 1,115,945 | 1,102,872 | 1,090,089 | 1,097,003 | 1,103,724 | 1,101,594 | 1,099,540 | 1,098,928 | 1,086,656 | 1,091,189 | 1,087,997 | 1,091,444 | 1,104,444 | 1,093,516 | 1,099,770 | 1,097,124 | 1,103,424 | 1,096,173 | 1,087,648 | 1,091,487 | 1,074,222 | 1,066,531 | 1,063,996 | 1,057,355 | 1,050,960 | 1,038,431 | 1,076,424 | 1,088,129 | 1,093,687 | 1,092,498 | 1,091,145 | 1,075,456 | 1,072,820 | 1,064,335 | 1,061,749 | 1,060,151 | 1,046,928 | 1,040,494 | 1,036,675 | 1,032,883 | 1,026,358 | 1,023,705 | 1,015,935 | 1,016,278 | 1,017,245 | 1,022,422 | 1,019,086 | 1,030,287 | 1,012,127 | 1,007,893 | 1,006,815 | 1,000,000 |
| EATON VANCE Index: Bloomberg Ohio Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Ohio Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,744 | 12,621 | 12,519 | 12,406 | 12,202 | 12,243 | 12,417 | 12,408 | 12,383 | 12,466 | 12,189 | 11,470 | 11,564 | 11,906 | 12,095 | 12,045 | 11,905 | 12,028 | 12,076 | 11,835 | 12,101 | 11,773 | 11,725 | 11,212 | 11,322 | 11,774 | 12,060 | 11,737 | 11,925 | 11,780 | 12,105 | 12,508 | 12,553 | 12,894 | 12,868 | 12,762 | 12,808 | 12,908 | 12,957 | 12,845 | 12,820 | 12,779 | 12,675 | 12,610 | 12,809 | 12,748 | 12,688 | 12,534 | 12,577 | 12,553 | 12,615 | 12,400 | 12,327 | 11,934 | 12,056 | 12,439 | 12,275 | 12,069 | 12,037 | 12,009 | 11,983 | 12,082 | 11,897 | 11,812 | 11,763 | 11,613 | 11,574 | 11,408 | 11,357 | 11,259 | 11,115 | 10,996 | 11,057 | 11,131 | 11,101 | 11,073 | 11,067 | 10,945 | 10,992 | 10,954 | 10,984 | 11,113 | 10,999 | 11,054 | 11,039 | 11,101 | 11,027 | 10,946 | 10,972 | 10,797 | 10,731 | 10,710 | 10,634 | 10,563 | 10,436 | 10,836 | 10,944 | 10,996 | 10,988 | 10,998 | 10,817 | 10,796 | 10,714 | 10,670 | 10,653 | 10,531 | 10,448 | 10,395 | 10,358 | 10,286 | 10,259 | 10,179 | 10,192 | 10,209 | 10,271 | 10,235 | 10,357 | 10,152 | 10,089 | 10,073 | 10,000 |
| EATON VANCE Index: Bloomberg Ohio Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Ohio Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,744 | 12,621 | 12,519 | 12,406 | 12,202 | 12,243 | 12,417 | 12,408 | 12,383 | 12,466 | 12,189 | 11,470 | 11,564 | 11,906 | 12,095 | 12,045 | 11,905 | 12,028 | 12,076 | 11,835 | 12,101 | 11,773 | 11,725 | 11,212 | 11,322 | 11,774 | 12,060 | 11,737 | 11,925 | 11,780 | 12,105 | 12,508 | 12,553 | 12,894 | 12,868 | 12,762 | 12,808 | 12,908 | 12,957 | 12,845 | 12,820 | 12,779 | 12,675 | 12,610 | 12,809 | 12,748 | 12,688 | 12,534 | 12,577 | 12,553 | 12,615 | 12,400 | 12,327 | 11,934 | 12,056 | 12,439 | 12,275 | 12,069 | 12,037 | 12,009 | 11,983 | 12,082 | 11,897 | 11,812 | 11,763 | 11,613 | 11,574 | 11,408 | 11,357 | 11,259 | 11,115 | 10,996 | 11,057 | 11,131 | 11,101 | 11,073 | 11,067 | 10,945 | 10,992 | 10,954 | 10,984 | 11,113 | 10,999 | 11,054 | 11,039 | 11,101 | 11,027 | 10,946 | 10,972 | 10,797 | 10,731 | 10,710 | 10,634 | 10,563 | 10,436 | 10,836 | 10,944 | 10,996 | 10,988 | 10,998 | 10,817 | 10,796 | 10,714 | 10,670 | 10,653 | 10,531 | 10,448 | 10,395 | 10,358 | 10,286 | 10,259 | 10,179 | 10,192 | 10,209 | 10,271 | 10,235 | 10,357 | 10,152 | 10,089 | 10,073 | 10,000 |
| EATON VANCE Index: Bloomberg Ohio Municipal Bond | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Ohio Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 1,274,424 | $ 1,262,142 | $ 1,251,894 | $ 1,240,614 | $ 1,220,243 | $ 1,224,339 | $ 1,241,716 | $ 1,240,815 | $ 1,238,276 | $ 1,246,628 | $ 1,218,904 | $ 1,146,974 | $ 1,156,387 | $ 1,190,629 | $ 1,209,500 | $ 1,204,450 | $ 1,190,467 | $ 1,202,812 | $ 1,207,645 | $ 1,183,492 | $ 1,210,091 | $ 1,177,253 | $ 1,172,509 | $ 1,121,167 | $ 1,132,199 | $ 1,177,354 | $ 1,206,014 | $ 1,173,677 | $ 1,192,462 | $ 1,177,954 | $ 1,210,537 | $ 1,250,775 | $ 1,255,313 | $ 1,289,357 | $ 1,286,770 | $ 1,276,194 | $ 1,280,795 | $ 1,290,777 | $ 1,295,722 | $ 1,284,528 | $ 1,281,952 | $ 1,277,876 | $ 1,267,535 | $ 1,261,004 | $ 1,280,863 | $ 1,274,786 | $ 1,268,784 | $ 1,253,439 | $ 1,257,720 | $ 1,255,318 | $ 1,261,511 | $ 1,240,015 | $ 1,232,701 | $ 1,193,369 | $ 1,205,555 | $ 1,243,902 | $ 1,227,465 | $ 1,206,914 | $ 1,203,706 | $ 1,200,850 | $ 1,198,269 | $ 1,208,189 | $ 1,189,734 | $ 1,181,206 | $ 1,176,304 | $ 1,161,273 | $ 1,157,416 | $ 1,140,771 | $ 1,135,681 | $ 1,125,852 | $ 1,111,488 | $ 1,099,577 | $ 1,105,683 | $ 1,113,088 | $ 1,110,102 | $ 1,107,326 | $ 1,106,686 | $ 1,094,492 | $ 1,099,196 | $ 1,095,437 | $ 1,098,398 | $ 1,111,265 | $ 1,099,917 | $ 1,105,389 | $ 1,103,931 | $ 1,110,085 | $ 1,102,730 | $ 1,094,628 | $ 1,097,242 | $ 1,079,712 | $ 1,073,056 | $ 1,070,999 | $ 1,063,359 | $ 1,056,318 | $ 1,043,628 | $ 1,083,640 | $ 1,094,351 | $ 1,099,643 | $ 1,098,783 | $ 1,099,835 | $ 1,081,694 | $ 1,079,556 | $ 1,071,389 | $ 1,066,981 | $ 1,065,332 | $ 1,053,094 | $ 1,044,771 | $ 1,039,471 | $ 1,035,807 | $ 1,028,588 | $ 1,025,920 | $ 1,017,875 | $ 1,019,192 | $ 1,020,941 | $ 1,027,092 | $ 1,023,497 | $ 1,035,744 | $ 1,015,221 | $ 1,008,936 | $ 1,007,339 | $ 1,000,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 120 Months Ended |
| Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | |
| C000013166 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class A with Maximum Sales Charge | ||
| Average Annual Return, Percent | 6.53% | 0.87% | 2.41% |
| C000013168 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class C | ||
| Average Annual Return, Percent | 8.20% | 0.76% | 2.14% |
| C000063954 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class I | ||
| C000013108 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class A with Maximum Sales Charge | ||
| Average Annual Return, Percent | 6.07% | (0.16%) | 1.39% |
| C000034083 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class C | ||
| Average Annual Return, Percent | 7.86% | (0.24%) | 1.12% |
| C000013110 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class I | ||
| C000013123 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class A with Maximum Sales Charge | ||
| Average Annual Return, Percent | 8.24% | 0.89% | 2.57% |
| C000013125 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class C | ||
| Average Annual Return, Percent | 9.99% | 0.80% | 2.30% |
| C000013126 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class I | ||
| C000013130 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class A with Maximum Sales Charge | ||
| Average Annual Return, Percent | 8.96% | 0.71% | 2.14% |
| C000013132 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class C | ||
| Average Annual Return, Percent | 10.84% | 0.62% | 1.88% |
| C000063949 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class I | ||
| C000013139 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class A with Maximum Sales Charge | ||
| Average Annual Return, Percent | 6.42% | 0.46% | 1.97% |
| C000013141 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class C | ||
| Average Annual Return, Percent | 8.10% | 0.37% | 1.70% |
| C000092721 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class I | ||
| Without Sales Load [Member] | C000013166 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 10.16% | 1.53% | 2.74% |
| Without Sales Load [Member] | C000013168 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 9.20% | 0.76% | 2.14% |
| Without Sales Load [Member] | C000063954 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 10.32% | 1.77% | 2.99% |
| Without Sales Load [Member] | C000013108 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 9.68% | 0.49% | 1.73% |
| Without Sales Load [Member] | C000034083 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 8.86% | (0.24%) | 1.12% |
| Without Sales Load [Member] | C000013110 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 9.90% | 0.69% | 1.92% |
| Without Sales Load [Member] | C000013123 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 11.82% | 1.55% | 2.91% |
| Without Sales Load [Member] | C000013125 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 10.99% | 0.80% | 2.30% |
| Without Sales Load [Member] | C000013126 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 12.10% | 1.81% | 3.15% |
| Without Sales Load [Member] | C000013130 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 12.57% | 1.38% | 2.48% |
| Without Sales Load [Member] | C000013132 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 11.84% | 0.62% | 1.88% |
| Without Sales Load [Member] | C000063949 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 12.79% | 1.58% | 2.68% |
| Without Sales Load [Member] | C000013139 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 10.05% | 1.13% | 2.31% |
| Without Sales Load [Member] | C000013141 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 9.10% | 0.37% | 1.70% |
| Without Sales Load [Member] | C000092721 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 10.13% | 1.33% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| 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 | 10.37% | 1.38% | 2.51% |
| EATON VANCE Index: Bloomberg California Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg California Municipal Bond Index | ||
| Average Annual Return, Percent | 9.87% | 1.32% | 2.48% |
| EATON VANCE Index: Bloomberg California Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg California Municipal Bond Index | ||
| Average Annual Return, Percent | 9.87% | 1.32% | 2.48% |
| EATON VANCE Index: Bloomberg California Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg California Municipal Bond Index | ||
| Average Annual Return, Percent | 9.87% | 1.32% | 2.48% |
| EATON VANCE Index: Bloomberg Massachusetts Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Massachusetts Municipal Bond Index | ||
| Average Annual Return, Percent | 9.94% | 1.15% | 2.27% |
| EATON VANCE Index: Bloomberg Massachusetts Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Massachusetts Municipal Bond Index | ||
| Average Annual Return, Percent | 9.94% | 1.15% | 2.27% |
| EATON VANCE Index: Bloomberg Massachusetts Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Massachusetts Municipal Bond Index | ||
| Average Annual Return, Percent | 9.94% | 1.15% | 2.27% |
| EATON VANCE Index: Bloomberg New York Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg New York Municipal Bond Index | ||
| Average Annual Return, Percent | 10.88% | 1.35% | 2.42% |
| EATON VANCE Index: Bloomberg New York Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg New York Municipal Bond Index | ||
| Average Annual Return, Percent | 10.88% | 1.35% | 2.42% |
| EATON VANCE Index: Bloomberg New York Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg New York Municipal Bond Index | ||
| Average Annual Return, Percent | 10.88% | 1.35% | 2.42% |
| EATON VANCE Index: Bloomberg Ohio Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Ohio Municipal Bond Index | ||
| Average Annual Return, Percent | 10.21% | 1.24% | 2.45% |
| EATON VANCE Index: Bloomberg Ohio Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Ohio Municipal Bond Index | ||
| Average Annual Return, Percent | 10.21% | 1.24% | 2.45% |
| EATON VANCE Index: Bloomberg Ohio Municipal Bond | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Ohio Municipal Bond Index | ||
| Average Annual Return, Percent | 10.21% | 1.24% | 2.45% |
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 |
| C000013166 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000013166 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000013166 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000013166 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.70% |
| C000013166 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.70% |
| C000013166 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.40% |
| C000013166 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.80% |
| C000013166 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000013166 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000013166 | Other Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000013166 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000013166 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000013166 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000013166 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19% |
| C000013166 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37% |
| C000013168 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000013168 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000013168 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000013168 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.70% |
| C000013168 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.70% |
| C000013168 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.40% |
| C000013168 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.80% |
| C000013168 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000013168 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000013168 | Other Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000013168 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000013168 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000013168 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000013168 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19% |
| C000013168 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37% |
| C000063954 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000063954 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| C000063954 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000063954 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.70% |
| C000063954 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 60.70% |
| C000063954 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.40% |
| C000063954 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.80% |
| C000063954 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000063954 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.50% |
| C000063954 | Other Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000063954 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.30% |
| C000063954 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000063954 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.60% |
| C000063954 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19% |
| C000063954 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 37% |
| C000013108 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000013108 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000013108 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| C000013108 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.40% |
| C000013108 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.80% |
| C000013108 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000013108 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000013108 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.20% |
| C000013108 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000013108 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000013108 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.40% |
| C000013108 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000013108 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000013108 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.30% |
| C000013108 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000034083 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000034083 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000034083 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| C000034083 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.40% |
| C000034083 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.80% |
| C000034083 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000034083 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000034083 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.20% |
| C000034083 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000034083 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000034083 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.40% |
| C000034083 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000034083 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000034083 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.30% |
| C000034083 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000013110 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000013110 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000013110 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| C000013110 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.40% |
| C000013110 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.80% |
| C000013110 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.70% |
| C000013110 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000013110 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.20% |
| C000013110 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.30% |
| C000013110 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000013110 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.40% |
| C000013110 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000013110 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000013110 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.30% |
| C000013110 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000013123 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000013123 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000013123 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| C000013123 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19% |
| C000013123 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50% |
| C000013123 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.80% |
| C000013123 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000013123 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000013123 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000013123 | Other Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000013123 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.80% |
| C000013123 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000013123 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000013123 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000013123 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.10% |
| C000013123 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000013125 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000013125 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000013125 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| C000013125 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19% |
| C000013125 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50% |
| C000013125 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.80% |
| C000013125 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000013125 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000013125 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000013125 | Other Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000013125 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.80% |
| C000013125 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000013125 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000013125 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000013125 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.10% |
| C000013125 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000013126 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000013126 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000013126 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| C000013126 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19% |
| C000013126 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50% |
| C000013126 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.80% |
| C000013126 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000013126 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000013126 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000013126 | Other Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000013126 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.80% |
| C000013126 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000013126 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000013126 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.60% |
| C000013126 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 21.10% |
| C000013126 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000013130 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| C000013130 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000013130 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| C000013130 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| C000013130 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.80% |
| C000013130 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.90% |
| C000013130 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000013130 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000013130 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000013130 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000013130 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000013130 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000013130 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000013130 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.90% |
| C000013130 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000013130 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.80% |
| C000013130 | Industrial Development Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000013132 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| C000013132 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000013132 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| C000013132 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| C000013132 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.80% |
| C000013132 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.90% |
| C000013132 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000013132 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000013132 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000013132 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000013132 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000013132 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000013132 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000013132 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.90% |
| C000013132 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000013132 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.80% |
| C000013132 | Industrial Development Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000063949 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| C000063949 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000063949 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| C000063949 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| C000063949 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.80% |
| C000063949 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.90% |
| C000063949 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000063949 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.60% |
| C000063949 | Housing | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.80% |
| C000063949 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.90% |
| C000063949 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000063949 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8% |
| C000063949 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000063949 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.90% |
| C000063949 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000063949 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 27.80% |
| C000063949 | Industrial Development Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000013139 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000013139 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000013139 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000013139 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| C000013139 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |
| C000013139 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| C000013139 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000013139 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000013139 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000013139 | Other Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000013139 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.50% |
| C000013139 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000013139 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000013139 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000013139 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.80% |
| C000013139 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000013139 | Industrial Development Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000013139 | Bond Bank | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000013141 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000013141 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000013141 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000013141 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| C000013141 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |
| C000013141 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| C000013141 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000013141 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000013141 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000013141 | Other Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000013141 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.50% |
| C000013141 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000013141 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000013141 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000013141 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.80% |
| C000013141 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000013141 | Industrial Development Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000013141 | Bond Bank | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000092721 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| C000092721 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| C000092721 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000092721 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| C000092721 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.60% |
| C000092721 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| C000092721 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| C000092721 | Industry Other Line | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.40% |
| C000092721 | Electric Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.50% |
| C000092721 | Other Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000092721 | Hospital | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.50% |
| C000092721 | Education | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.70% |
| C000092721 | Water and Sewer | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.40% |
| C000092721 | Transportation | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| C000092721 | General Obligations | |
| Holdings [Line Items] | |
| Percent of Total Investments | 30.80% |
| C000092721 | Special Tax Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000092721 | Industrial Development Revenue | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.20% |
| C000092721 | Bond Bank | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
