Shareholder Fees - Eaton Vance AMT-Free Municipal Income Fund |
Sep. 30, 2025 |
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| Eaton Vance AMT-Free Municipal Income Fund Class A | ||||
| Prospectus [Line Items] | ||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | 3.25% | |||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | 0.00% | [1] | ||
| Eaton Vance AMT-Free Municipal Income Fund Class C | ||||
| Prospectus [Line Items] | ||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | 0.00% | |||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | 1.00% | |||
| Eaton Vance AMT-Free Municipal Income Fund Class I | ||||
| Prospectus [Line Items] | ||||
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | 0.00% | |||
| Maximum Deferred Sales Charge (as a percentage of Offering Price) | 0.00% | |||
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