| MMDT Cash Portfolio Infographic  September 30 2025  |  What is the MMDT Cash Portfolio?  | September 30 2025 | 
  | MMDT Short Term Bond Portfolio Infographic  September 30 2025  |  What is the MMDT Short Term Bond Portfolio?  | September 30 2025 | 
  | MMDT Cash Portfolio Fact Sheet  September 30 2025  |  MMDT Cash Portfolio Fact Sheet  | September 30 2025 | 
  | MMDT Short Term Bond Portfolio Fact Sheet  September 30 2025  |  MMDT Short Term Bond Portfolio Fact Sheet  | September 30 2025 | 
  | Massachusetts Municipal Depository Trust Annual Report  September 19 2025  |  Massachusetts Municipal Depository Trust Annual Report  | September 19 2025 | 
  | MMDT Cash Portfolio Investment Circular  March 1 2025  |  Investment Circular  | March 1 2025 | 
  | MMDT Short Term Bond Portfolio Investment Circular  March 1 2025  |  Investment Circular  | March 1 2025 |