Vanguard Ohio Long-Term Tax-Exempt Fund S000002908 [Member] Investor Shares C000007973 [Member] After Taxes on Distributions[Member] After Taxes on Distributions And Sales[Member] Bloomberg OH Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)[Member] Bloomberg Municipal Bond Index (reflects no deduction for fees, expenses, or taxes)[Member] General Market Risk [Member] Investing in Bond Markets Risk [Member] Investing in Muni Bond Mkt Risk [Member] Tax-Exempt Income Risk [Member] Interest Rate Risk [Member] Income Risk [Member] Credit Risk [Member] Municipal Bond Liquidity Risk [Member] Call Risk [Member] Extension Risk [Member] State-Specific Focus Risk [Member] Active Management Risk [Member]