v3.25.4
Shareholder Report, Holdings (Details)
Nov. 30, 2025
C000005526 | U.S. Treasury Inflation-Indexed Notes  
Holdings [Line Items]  
Percent of Net Asset Value 85.60%
C000005526 | U.S. Treasury Inflation-Indexed Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 13.80%
C000005526 | GS Mortgage-Backed Securities Trust  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000005526 | U.S. Government Agency Obligations (Excluding Mortgage-Backed)  
Holdings [Line Items]  
Percent of Net Asset Value 99.40%
C000005526 | Non-U.S. Government Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000005526 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000166332 | U.S. Treasury Inflation-Indexed Notes  
Holdings [Line Items]  
Percent of Net Asset Value 85.60%
C000166332 | U.S. Treasury Inflation-Indexed Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 13.80%
C000166332 | GS Mortgage-Backed Securities Trust  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000166332 | U.S. Government Agency Obligations (Excluding Mortgage-Backed)  
Holdings [Line Items]  
Percent of Net Asset Value 99.40%
C000166332 | Non-U.S. Government Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000166332 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%
C000225818 | U.S. Treasury Inflation-Indexed Notes  
Holdings [Line Items]  
Percent of Net Asset Value 85.60%
C000225818 | U.S. Treasury Inflation-Indexed Bonds  
Holdings [Line Items]  
Percent of Net Asset Value 13.80%
C000225818 | GS Mortgage-Backed Securities Trust  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000225818 | U.S. Government Agency Obligations (Excluding Mortgage-Backed)  
Holdings [Line Items]  
Percent of Net Asset Value 99.40%
C000225818 | Non-U.S. Government Mortgage-Backed Securities  
Holdings [Line Items]  
Percent of Net Asset Value 0.00%
C000225818 | Other Holdings Grouping  
Holdings [Line Items]  
Percent of Net Asset Value 0.60%