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Average Annual Total Returns
 18 Months Ended
Mar. 31, 2013
Vanguard Target Retirement 2010 Fund | Vanguard Target Retirement 2010 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 10.12%
Five Years 3.73%
Since Inception 5.53%
Inception Date Jun. 07, 2006
Vanguard Target Retirement 2015 Fund | Vanguard Target Retirement 2015 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 11.37%
Five Years 3.25%
Since Inception 5.87%
Inception Date Oct. 27, 2003
Vanguard Target Retirement 2020 Fund | Vanguard Target Retirement 2020 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 12.35%
Five Years 2.81%
Since Inception 5.06%
Inception Date Jun. 07, 2006
Vanguard Target Retirement 2025 Fund | Vanguard Target Retirement 2025 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 13.29%
Five Years 2.33%
Since Inception 5.80%
Inception Date Oct. 27, 2003
Vanguard Target Retirement 2030 Fund | Vanguard Target Retirement 2030 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 14.24%
Five Years 1.88%
Since Inception 4.57%
Inception Date Jun. 07, 2006
Vanguard Target Retirement 2035 Fund | Vanguard Target Retirement 2035 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.16%
Five Years 1.66%
Since Inception 6.03%
Inception Date Oct. 27, 2003
Vanguard Target Retirement 2040 Fund | Vanguard Target Retirement 2040 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.56%
Five Years 1.73%
Since Inception 4.39%
Inception Date Jun. 07, 2006
Vanguard Target Retirement 2045 Fund | Vanguard Target Retirement 2045 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.58%
Five Years 1.71%
Since Inception 6.39%
Inception Date Oct. 27, 2003
Vanguard Target Retirement 2050 Fund | Vanguard Target Retirement 2050 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.58%
Five Years 1.71%
Since Inception 4.46%
Inception Date Jun. 07, 2006
Vanguard Target Retirement 2055 Fund | Vanguard Target Retirement 2055 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.58%
Since Inception 11.67%
Inception Date Aug. 18, 2010
Vanguard Target Retirement Income Fund | Vanguard Target Retirement Income Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 8.23%
Five Years 4.87%
Since Inception 5.62%
Inception Date Oct. 27, 2003
Return After Taxes on Distributions | Vanguard Target Retirement 2010 Fund | Vanguard Target Retirement 2010 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 9.44%
Five Years 2.94%
Since Inception 4.80%
Return After Taxes on Distributions | Vanguard Target Retirement 2015 Fund | Vanguard Target Retirement 2015 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 10.72%
Five Years 2.53%
Since Inception 5.16%
Return After Taxes on Distributions | Vanguard Target Retirement 2020 Fund | Vanguard Target Retirement 2020 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 11.78%
Five Years 2.20%
Since Inception 4.49%
Return After Taxes on Distributions | Vanguard Target Retirement 2025 Fund | Vanguard Target Retirement 2025 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 12.74%
Five Years 1.75%
Since Inception 5.22%
Return After Taxes on Distributions | Vanguard Target Retirement 2030 Fund | Vanguard Target Retirement 2030 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 13.74%
Five Years 1.40%
Since Inception 4.11%
Return After Taxes on Distributions | Vanguard Target Retirement 2035 Fund | Vanguard Target Retirement 2035 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 14.69%
Five Years 1.19%
Since Inception 5.58%
Return After Taxes on Distributions | Vanguard Target Retirement 2040 Fund | Vanguard Target Retirement 2040 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.11%
Five Years 1.29%
Since Inception 3.97%
Return After Taxes on Distributions | Vanguard Target Retirement 2045 Fund | Vanguard Target Retirement 2045 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.12%
Five Years 1.23%
Since Inception 5.95%
Return After Taxes on Distributions | Vanguard Target Retirement 2050 Fund | Vanguard Target Retirement 2050 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.14%
Five Years 1.25%
Since Inception 4.01%
Return After Taxes on Distributions | Vanguard Target Retirement 2055 Fund | Vanguard Target Retirement 2055 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.20%
Since Inception 11.25%
Return After Taxes on Distributions | Vanguard Target Retirement Income Fund | Vanguard Target Retirement Income Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 7.49%
Five Years 3.93%
Since Inception 4.52%
Return After Taxes on Distributions and Sale of Fund Shares | Vanguard Target Retirement 2010 Fund | Vanguard Target Retirement 2010 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 6.78%
Five Years 2.78%
Since Inception 4.40%
Return After Taxes on Distributions and Sale of Fund Shares | Vanguard Target Retirement 2015 Fund | Vanguard Target Retirement 2015 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 7.65%
Five Years 2.42%
Since Inception 4.75%
Return After Taxes on Distributions and Sale of Fund Shares | Vanguard Target Retirement 2020 Fund | Vanguard Target Retirement 2020 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 8.32%
Five Years 2.12%
Since Inception 4.11%
Return After Taxes on Distributions and Sale of Fund Shares | Vanguard Target Retirement 2025 Fund | Vanguard Target Retirement 2025 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 8.97%
Five Years 1.73%
Since Inception 4.80%
Return After Taxes on Distributions and Sale of Fund Shares | Vanguard Target Retirement 2030 Fund | Vanguard Target Retirement 2030 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 9.62%
Five Years 1.41%
Since Inception 3.77%
Return After Taxes on Distributions and Sale of Fund Shares | Vanguard Target Retirement 2035 Fund | Vanguard Target Retirement 2035 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 10.26%
Five Years 1.25%
Since Inception 5.11%
Return After Taxes on Distributions and Sale of Fund Shares | Vanguard Target Retirement 2040 Fund | Vanguard Target Retirement 2040 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 10.52%
Five Years 1.32%
Since Inception 3.64%
Return After Taxes on Distributions and Sale of Fund Shares | Vanguard Target Retirement 2045 Fund | Vanguard Target Retirement 2045 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 10.54%
Five Years 1.29%
Since Inception 5.44%
Return After Taxes on Distributions and Sale of Fund Shares | Vanguard Target Retirement 2050 Fund | Vanguard Target Retirement 2050 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 10.53%
Five Years 1.30%
Since Inception 3.70%
Return After Taxes on Distributions and Sale of Fund Shares | Vanguard Target Retirement 2055 Fund | Vanguard Target Retirement 2055 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 10.48%
Since Inception 9.90%
Return After Taxes on Distributions and Sale of Fund Shares | Vanguard Target Retirement Income Fund | Vanguard Target Retirement Income Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 5.48%
Five Years 3.66%
Since Inception 4.23%
Barclays U.S. Aggregate Bond Index | Vanguard Target Retirement 2010 Fund | Vanguard Target Retirement 2010 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 4.21%
Five Years 5.95%
Since Inception 6.33%
Barclays U.S. Aggregate Bond Index | Vanguard Target Retirement 2015 Fund | Vanguard Target Retirement 2015 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 4.21%
Five Years 5.95%
Since Inception 5.34%
Barclays U.S. Aggregate Bond Index | Vanguard Target Retirement 2020 Fund | Vanguard Target Retirement 2020 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 4.21%
Five Years 5.95%
Since Inception 6.33%
Barclays U.S. Aggregate Bond Index | Vanguard Target Retirement 2025 Fund | Vanguard Target Retirement 2025 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 4.21%
Five Years 5.95%
Since Inception 5.34%
Barclays U.S. Aggregate Bond Index | Vanguard Target Retirement 2030 Fund | Vanguard Target Retirement 2030 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 4.21%
Five Years 5.95%
Since Inception 6.33%
Barclays U.S. Aggregate Bond Index | Vanguard Target Retirement 2035 Fund | Vanguard Target Retirement 2035 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 4.21%
Five Years 5.95%
Since Inception 5.34%
Barclays U.S. Aggregate Bond Index | Vanguard Target Retirement 2040 Fund | Vanguard Target Retirement 2040 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 4.21%
Five Years 5.95%
Since Inception 6.33%
Barclays U.S. Aggregate Bond Index | Vanguard Target Retirement 2045 Fund | Vanguard Target Retirement 2045 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 4.21%
Five Years 5.95%
Since Inception 5.34%
Barclays U.S. Aggregate Bond Index | Vanguard Target Retirement 2050 Fund | Vanguard Target Retirement 2050 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 4.21%
Five Years 5.95%
Since Inception 6.33%
Barclays U.S. Aggregate Bond Index | Vanguard Target Retirement 2055 Fund | Vanguard Target Retirement 2055 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 4.21%
Since Inception 4.76%
Barclays U.S. Aggregate Bond Index | Vanguard Target Retirement Income Fund | Vanguard Target Retirement Income Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 4.21%
Five Years 5.95%
Since Inception 5.34%
Target Income Composite Index | Vanguard Target Retirement Income Fund | Vanguard Target Retirement Income Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 8.42%
Five Years 4.83%
Since Inception 5.62%
Target 2015 Composite Index | Vanguard Target Retirement 2015 Fund | Vanguard Target Retirement 2015 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 11.51%
Five Years 3.16%
Since Inception 5.84%
Target 2025 Composite Index | Vanguard Target Retirement 2025 Fund | Vanguard Target Retirement 2025 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 13.44%
Five Years 2.39%
Since Inception 5.86%
Target 2035 Composite Index | Vanguard Target Retirement 2035 Fund | Vanguard Target Retirement 2035 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.27%
Five Years 1.70%
Since Inception 6.10%
Target 2045 Composite Index | Vanguard Target Retirement 2045 Fund | Vanguard Target Retirement 2045 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.58%
Five Years 1.72%
Since Inception 6.44%
MSCI US Broad Market Index | Vanguard Target Retirement 2010 Fund | Vanguard Target Retirement 2010 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 16.44%
Five Years 2.27%
Since Inception 4.58%
MSCI US Broad Market Index | Vanguard Target Retirement 2015 Fund | Vanguard Target Retirement 2015 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 16.44%
Five Years 2.27%
Since Inception 6.42%
MSCI US Broad Market Index | Vanguard Target Retirement 2020 Fund | Vanguard Target Retirement 2020 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 16.44%
Five Years 2.27%
Since Inception 4.58%
MSCI US Broad Market Index | Vanguard Target Retirement 2025 Fund | Vanguard Target Retirement 2025 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 16.44%
Five Years 2.27%
Since Inception 6.42%
MSCI US Broad Market Index | Vanguard Target Retirement 2030 Fund | Vanguard Target Retirement 2030 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 16.44%
Five Years 2.27%
Since Inception 4.58%
MSCI US Broad Market Index | Vanguard Target Retirement 2035 Fund | Vanguard Target Retirement 2035 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 16.44%
Five Years 2.27%
Since Inception 6.42%
MSCI US Broad Market Index | Vanguard Target Retirement 2040 Fund | Vanguard Target Retirement 2040 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 16.44%
Five Years 2.27%
Since Inception 4.58%
MSCI US Broad Market Index | Vanguard Target Retirement 2045 Fund | Vanguard Target Retirement 2045 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 16.44%
Five Years 2.27%
Since Inception 6.42%
MSCI US Broad Market Index | Vanguard Target Retirement 2050 Fund | Vanguard Target Retirement 2050 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 16.44%
Five Years 2.27%
Since Inception 4.58%
MSCI US Broad Market Index | Vanguard Target Retirement 2055 Fund | Vanguard Target Retirement 2055 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 16.44%
Since Inception 14.62%
MSCI US Broad Market Index | Vanguard Target Retirement Income Fund | Vanguard Target Retirement Income Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 16.44%
Five Years 2.27%
Since Inception 6.42%
Target 2050 Composite Index | Vanguard Target Retirement 2050 Fund | Vanguard Target Retirement 2050 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.58%
Five Years 1.72%
Since Inception 4.48%
Target 2040 Composite Index | Vanguard Target Retirement 2040 Fund | Vanguard Target Retirement 2040 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.58%
Five Years 1.72%
Since Inception 4.41%
Target 2030 Composite Index | Vanguard Target Retirement 2030 Fund | Vanguard Target Retirement 2030 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 14.36%
Five Years 1.91%
Since Inception 4.63%
Target 2020 Composite Index | Vanguard Target Retirement 2020 Fund | Vanguard Target Retirement 2020 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 12.51%
Five Years 2.85%
Since Inception 5.11%
Target 2010 Composite Index | Vanguard Target Retirement 2010 Fund | Vanguard Target Retirement 2010 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 10.28%
Five Years 3.68%
Since Inception 5.49%
Target Retirement 2055 Composite Index | Vanguard Target Retirement 2055 Fund | Vanguard Target Retirement 2055 Fund - Investor Shares
  
Average Annual Returns for Periods Ended December 31, 2012  
One Year 15.58%
Since Inception 11.74%