v3.26.1
Expense Example
Jul. 27, 2026
USD ($)
T. Rowe Price U.S. Limited Duration TIPS Index Fund- Investor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 22
Expense Example, with Redemption, 3 Years 86
Expense Example, with Redemption, 5 Years 175
Expense Example, with Redemption, 10 Years 436
T. Rowe Price U.S. Limited Duration TIPS Index Fund-I Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 11
Expense Example, with Redemption, 3 Years 37
Expense Example, with Redemption, 5 Years 66
Expense Example, with Redemption, 10 Years 152
T. Rowe Price U.S. Limited Duration TIPS Index Fund-Z Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 0
Expense Example, with Redemption, 3 Years 0
Expense Example, with Redemption, 5 Years 0
Expense Example, with Redemption, 10 Years $ 0