Vanguard GNMA Fund Expense Example - Retail Prospectus [Member] - Vanguard GNMA Fund |
Jan. 31, 2026
USD ($)
|
|---|---|
| Investor Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 22 |
| Expense Example, with Redemption, 3 Years | 68 |
| Expense Example, with Redemption, 5 Years | 118 |
| Expense Example, with Redemption, 10 Years | 268 |
| Admiral Shares | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 11 |
| Expense Example, with Redemption, 3 Years | 35 |
| Expense Example, with Redemption, 5 Years | 62 |
| Expense Example, with Redemption, 10 Years | $ 141 |