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Shareholder Report
6 Months Ended
Feb. 28, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name DELAWARE GROUP STATE TAX-FREE INCOME TRUST
Entity Central Index Key 0000201670
Entity Investment Company Type N-1A
Document Period End Date Feb. 28, 2025
C000006342 [Member]  
Shareholder Report [Line Items]  
Fund Name Macquarie Tax-Free Pennsylvania Fund(formerly, Delaware Tax-Free Pennsylvania Fund)
Class Name Class A
Trading Symbol DELIX
Annual or Semi-Annual Statement [Text Block] This semiannual shareholder report contains important information about Macquarie Tax-Free Pennsylvania Fund (Fund) for the period of September 1, 2024, to February 28, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at macquarie.com/mam/literature. You can also request this information by contacting us at 800 523-1918, weekdays from 8:30am to 6:00pm ET.
Additional Information Phone Number 800 523-1918
Additional Information Website macquarie.com/mam/literature
Expenses [Text Block]
What were the Fund's costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment^
Class A $41 0.83%
^
Annualized.
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.83% [1]
Net Assets $ 438,288,600
Holdings Count | Holding 172
Advisory Fees Paid, Amount $ 909,687
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Fund statistics (as of February 28, 2025)
Fund net assets $438,288,600
Total number of portfolio holdings 172
Total advisory fees paid $909,687
Portfolio turnover rate 7%
Holdings [Text Block]
Fund holdings (as of February 28, 2025)
The tables below show the investment makeup of the Fund, with each category representing a percentage of the total net assets of the Fund.
Sector allocation
Healthcare Revenue Bonds 30.13%
Special Tax Revenue Bonds 17.22%
Transportation Revenue Bonds 16.39%
Education Revenue Bonds 13.59%
Industrial Development Revenue/Pollution Control
Revenue Bonds
8.06%
Housing Revenue Bonds 3.85%
Local General Obligation Bonds 3.26%
State General Obligation Bonds 2.93%
Water & Sewer Revenue Bonds 1.26%
Lease Revenue Bonds 0.61%
State and territory allocation 
Pennsylvania 81.52%
Puerto Rico 15.53%
US Virgin Islands 1.20%
C000006344 [Member]  
Shareholder Report [Line Items]  
Fund Name Macquarie Tax-Free Pennsylvania Fund(formerly, Delaware Tax-Free Pennsylvania Fund)
Class Name Class C
Trading Symbol DPTCX
Annual or Semi-Annual Statement [Text Block] This semiannual shareholder report contains important information about Macquarie Tax-Free Pennsylvania Fund (Fund) for the period of September 1, 2024, to February 28, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at macquarie.com/mam/literature. You can also request this information by contacting us at 800 523-1918, weekdays from 8:30am to 6:00pm ET.
Additional Information Phone Number 800 523-1918
Additional Information Website macquarie.com/mam/literature
Expenses [Text Block]
What were the Fund's costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment^
Class C $79 1.58%
^
Annualized.
Expenses Paid, Amount $ 79
Expense Ratio, Percent 1.58% [2]
Net Assets $ 438,288,600
Holdings Count | Holding 172
Advisory Fees Paid, Amount $ 909,687
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Fund statistics (as of February 28, 2025)
Fund net assets $438,288,600
Total number of portfolio holdings 172
Total advisory fees paid $909,687
Portfolio turnover rate 7%
Holdings [Text Block]
Fund holdings (as of February 28, 2025)
The tables below show the investment makeup of the Fund, with each category representing a percentage of the total net assets of the Fund.
Sector allocation
Healthcare Revenue Bonds 30.13%
Special Tax Revenue Bonds 17.22%
Transportation Revenue Bonds 16.39%
Education Revenue Bonds 13.59%
Industrial Development Revenue/Pollution Control
Revenue Bonds
8.06%
Housing Revenue Bonds 3.85%
Local General Obligation Bonds 3.26%
State General Obligation Bonds 2.93%
Water & Sewer Revenue Bonds 1.26%
Lease Revenue Bonds 0.61%
State and territory allocation 
Pennsylvania 81.52%
Puerto Rico 15.53%
US Virgin Islands 1.20%
C000135933 [Member]  
Shareholder Report [Line Items]  
Fund Name Macquarie Tax-Free Pennsylvania Fund(formerly, Delaware Tax-Free Pennsylvania Fund)
Class Name Institutional Class
Trading Symbol DTPIX
Annual or Semi-Annual Statement [Text Block] This semiannual shareholder report contains important information about Macquarie Tax-Free Pennsylvania Fund (Fund) for the period of September 1, 2024, to February 28, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at macquarie.com/mam/literature. You can also request this information by contacting us at 800 523-1918, weekdays from 8:30am to 6:00pm ET.
Additional Information Phone Number 800 523-1918
Additional Information Website macquarie.com/mam/literature
Expenses [Text Block]
What were the Fund's costs for the last six months ?
(Based on a hypothetical $10,000 investment)
Class Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment^
Institutional Class $29 0.58%
^
Annualized.
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.58% [3]
Net Assets $ 438,288,600
Holdings Count | Holding 172
Advisory Fees Paid, Amount $ 909,687
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Fund statistics (as of February 28, 2025)
Fund net assets $438,288,600
Total number of portfolio holdings 172
Total advisory fees paid $909,687
Portfolio turnover rate 7%
Holdings [Text Block]
Fund holdings (as of February 28, 2025)
The tables below show the investment makeup of the Fund, with each category representing a percentage of the total net assets of the Fund.
Sector allocation
Healthcare Revenue Bonds 30.13%
Special Tax Revenue Bonds 17.22%
Transportation Revenue Bonds 16.39%
Education Revenue Bonds 13.59%
Industrial Development Revenue/Pollution Control
Revenue Bonds
8.06%
Housing Revenue Bonds 3.85%
Local General Obligation Bonds 3.26%
State General Obligation Bonds 2.93%
Water & Sewer Revenue Bonds 1.26%
Lease Revenue Bonds 0.61%
State and territory allocation 
Pennsylvania 81.52%
Puerto Rico 15.53%
US Virgin Islands 1.20%
[1] Annualized.
[2] Annualized.
[3] Annualized.