v3.24.4
Expense Example
Aug. 31, 2024
USD ($)
Schwab Short-Term Bond Index Fund | Schwab Short-Term Bond Index Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 6
Expense Example, with Redemption, 3 Years 19
Expense Example, with Redemption, 5 Years 34
Expense Example, with Redemption, 10 Years 77
Schwab Treasury Inflation Protected Securities Index Fund | Schwab Treasury Inflation Protected Securities Index Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 5
Expense Example, with Redemption, 3 Years 16
Expense Example, with Redemption, 5 Years 28
Expense Example, with Redemption, 10 Years 64
Schwab U.S. Aggregate Bond Index Fund | Schwab U.S. Aggregate Bond Index Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 4
Expense Example, with Redemption, 3 Years 13
Expense Example, with Redemption, 5 Years 23
Expense Example, with Redemption, 10 Years 51
Schwab Tax-Free Bond Fund | Schwab Tax-Free Bond Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 39
Expense Example, with Redemption, 3 Years 122
Expense Example, with Redemption, 5 Years 213
Expense Example, with Redemption, 10 Years 480
Schwab California Tax-Free Bond Fund | Schwab California Tax-Free Bond Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 39
Expense Example, with Redemption, 3 Years 122
Expense Example, with Redemption, 5 Years 213
Expense Example, with Redemption, 10 Years 480
Schwab Opportunistic Municipal Bond Fund | Schwab Opportunistic Municipal Bond Fund  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 51
Expense Example, with Redemption, 3 Years 160
Expense Example, with Redemption, 5 Years 280
Expense Example, with Redemption, 10 Years $ 628