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Annual Fund Operating Expenses (Vanguard Admiral Treasury Money Market Fund - Investor Shares, Vanguard Admiral Treasury Money Market Fund)
12 Months Ended
Aug. 31, 2011
Vanguard Admiral Treasury Money Market Fund - Investor Shares | Vanguard Admiral Treasury Money Market Fund
 
Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)  
Management Expenses 0.10%
12b-1 Distribution Fee none
Other Expenses 0.02%
Total Annual Fund Operating Expenses 0.12% [1],[2]
[1] Vanguard and the Fund's Board have voluntarily agreed to temporarily limit certain net operating expenses in excess of the Fund's daily yield so as to maintain a zero or positive yield for the Fund. Vanguard and the Fund's Board may terminate the temporary expense limitation at any time.
[2] Vanguard and the Fund's Board have voluntarily agreed to temporarily limit certain net operating expenses in excess of the Fund|s daily yield so as to maintain a zero or positive yield for the Fund. Vanguard and the Fund|s Board may terminate the temporary expense limitation at any time.