| Form N-CSR Cover | 12 Months Ended |
| Nov. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Vanguard Massachusetts Tax-Exempt Funds |
| Entity Central Index Key | 0001070414 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Nov. 30, 2024 |
| Shareholder Report | 12 Months Ended |
| Nov. 30, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Vanguard Massachusetts Tax-Exempt Funds |
| Entity Central Index Key | 0001070414 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Nov. 30, 2024 |
| C000007887 | |
| Shareholder Report [Line Items] | |
| Fund Name | Massachusetts Tax-Exempt Fund |
| Class Name | Investor Shares |
| Trading Symbol | VMATX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Massachusetts Tax-Exempt Fund (the "Fund") for the period of December 1, 2023, to November 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447. |
| Additional Information Phone Number | 800-662-7447 |
| Additional Information Website | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Expenses [Text Block] | What were the Fund costs for the last year? (based on a hypothetical $10,000 investment) Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Shares $13 0.13% |
| Expenses Paid, Amount | $ 13 |
| Expense Ratio, Percent | 0.13% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended November 30, 2024, the Fund outperformed its benchmark, the Bloomberg MA Municipal Bond Index. At the national level, economic growth hovered around 3% on a year-over-year basis for the period, quelling recession fears. Consumer price inflation trended lower, falling below 3% in July, and the Federal Reserve began to cut short-term interest rates in September. The pivot in monetary policy contributed to strong gains for U.S. investment-grade bonds. In the municipal bond market, strong fundamentals, including historically high reserve balances and consistent tax revenues, drove returns. Security selection, particularly in general obligation bonds, school districts, and hospitals, helped the Fund beat its benchmark. An above-benchmark level of interest rate sensitivity and an above-benchmark allocation to lower-rated bonds also contributed. |
| Line Graph [Table Text Block] | Investor Shares Bloomberg MA Municipal Bond Index Bloomberg Municipal Bond Index 2014 $10,000 $10,000 $10,000 2015 $10,137 $10,112 $10,123 2015 $10,094 $10,069 $10,071 2015 $10,212 $10,166 $10,155 2015 $10,377 $10,314 $10,310 2016 $10,586 $10,524 $10,523 2016 $10,771 $10,649 $10,662 2016 $10,975 $10,833 $10,853 2016 $10,307 $10,230 $10,287 2017 $10,555 $10,503 $10,549 2017 $10,856 $10,775 $10,818 2017 $10,997 $10,893 $10,949 2017 $10,944 $10,783 $10,862 2018 $10,850 $10,715 $10,813 2018 $10,995 $10,835 $10,938 2018 $11,018 $10,894 $11,003 2018 $10,978 $10,880 $10,984 2019 $11,274 $11,151 $11,260 2019 $11,753 $11,509 $11,639 2019 $12,126 $11,824 $11,962 2019 $12,066 $11,784 $11,917 2020 $12,543 $12,162 $12,325 2020 $12,340 $12,118 $12,102 2020 $12,593 $12,250 $12,349 2020 $12,794 $12,388 $12,500 2021 $12,729 $12,277 $12,455 2021 $13,028 $12,479 $12,675 2021 $13,089 $12,563 $12,768 2021 $13,117 $12,536 $12,747 2022 $12,686 $12,161 $12,373 2022 $11,994 $11,621 $11,814 2022 $11,753 $11,494 $11,666 2022 $11,768 $11,480 $11,645 2023 $11,822 $11,552 $11,743 2023 $11,973 $11,670 $11,872 2023 $11,946 $11,627 $11,865 2023 $12,217 $11,874 $12,144 2024 $12,538 $12,104 $12,379 2024 $12,385 $11,894 $12,189 2024 $12,818 $12,302 $12,587 2024 $13,003 $12,449 $12,743 |
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Investor Shares 6.43% 1.51% 2.66% Bloomberg MA Municipal Bond Index 4.84% 1.10% 2.21% Bloomberg Municipal Bond Index 4.93% 1.35% 2.45% |
| AssetsNet | $ 2,919,000,000 |
| Holdings Count | Holding | 897 |
| Advisory Fees Paid, Amount | $ 286,000 |
| InvestmentCompanyPortfolioTurnover | 92% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of November 30, 2024 Fund Net Assets (in millions) $2,919 Number of Portfolio Holdings 897 Portfolio Turnover Rate 92% Total Investment Advisory Fees (in thousands) $286 |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Distribution by Stated Maturity % of Net Assets (as of November 30, 2024) Less than 1 Year 7.0% 1 to 3 Years 2.4% 3 to 5 Years 4.1% 5 to 10 Years 9.1% 10 to 20 Years 34.8% 20 to 30 Years 35.7% Greater than 30 Years 5.6% Other Assets and Liabilities—Net 1.3% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||||
| Nov. 30, 2024 | Aug. 31, 2024 | May 31, 2024 | Feb. 29, 2024 | Nov. 30, 2023 | Aug. 31, 2023 | May 31, 2023 | Feb. 28, 2023 | Nov. 30, 2022 | Aug. 31, 2022 | May 31, 2022 | Feb. 28, 2022 | Nov. 30, 2021 | Aug. 31, 2021 | May 31, 2021 | Feb. 28, 2021 | Nov. 30, 2020 | Aug. 31, 2020 | May 31, 2020 | Feb. 29, 2020 | Nov. 30, 2019 | Aug. 31, 2019 | May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | |
| C000007887 | |||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Investor Shares | ||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 13,003 | $ 12,818 | $ 12,385 | $ 12,538 | $ 12,217 | $ 11,946 | $ 11,973 | $ 11,822 | $ 11,768 | $ 11,753 | $ 11,994 | $ 12,686 | $ 13,117 | $ 13,089 | $ 13,028 | $ 12,729 | $ 12,794 | $ 12,593 | $ 12,340 | $ 12,543 | $ 12,066 | $ 12,126 | $ 11,753 | $ 11,274 | $ 10,978 | $ 11,018 | $ 10,995 | $ 10,850 | $ 10,944 | $ 10,997 | $ 10,856 | $ 10,555 | $ 10,307 | $ 10,975 | $ 10,771 | $ 10,586 | $ 10,377 | $ 10,212 | $ 10,094 | $ 10,137 | $ 10,000 |
| NACC2 Index: Bloomberg MA Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg MA Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,449 | 12,302 | 11,894 | 12,104 | 11,874 | 11,627 | 11,670 | 11,552 | 11,480 | 11,494 | 11,621 | 12,161 | 12,536 | 12,563 | 12,479 | 12,277 | 12,388 | 12,250 | 12,118 | 12,162 | 11,784 | 11,824 | 11,509 | 11,151 | 10,880 | 10,894 | 10,835 | 10,715 | 10,783 | 10,893 | 10,775 | 10,503 | 10,230 | 10,833 | 10,649 | 10,524 | 10,314 | 10,166 | 10,069 | 10,112 | 10,000 |
| NACC2 Index: Bloomberg Municipal Bond Index | |||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,743 | $ 12,587 | $ 12,189 | $ 12,379 | $ 12,144 | $ 11,865 | $ 11,872 | $ 11,743 | $ 11,645 | $ 11,666 | $ 11,814 | $ 12,373 | $ 12,747 | $ 12,768 | $ 12,675 | $ 12,455 | $ 12,500 | $ 12,349 | $ 12,102 | $ 12,325 | $ 11,917 | $ 11,962 | $ 11,639 | $ 11,260 | $ 10,984 | $ 11,003 | $ 10,938 | $ 10,813 | $ 10,862 | $ 10,949 | $ 10,818 | $ 10,549 | $ 10,287 | $ 10,853 | $ 10,662 | $ 10,523 | $ 10,310 | $ 10,155 | $ 10,071 | $ 10,123 | $ 10,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 120 Months Ended |
| Nov. 30, 2024 | Nov. 30, 2024 | Nov. 30, 2024 | |
| C000007887 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Investor Shares | ||
| Without Sales Load [Member] | C000007887 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 6.43% | 1.51% | 2.66% |
| NACC2 Index: Bloomberg MA Municipal Bond Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg MA Municipal Bond Index | ||
| Average Annual Return, Percent | 4.84% | 1.10% | 2.21% |
| NACC2 Index: Bloomberg Municipal Bond Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||
| Average Annual Return, Percent | 4.93% | 1.35% | 2.45% |
| Shareholder Report, Holdings (Details) - C000007887 | Nov. 30, 2024 |
| Less than 1 Year | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| 1 to 3 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| 3 to 5 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| 5 to 10 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| 10 to 20 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 34.80% |
| 20 to 30 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.70% |
| Greater than 30 Years | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Other Line | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
