v3.25.3
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 120 Months Ended
Aug. 31, 2025
Aug. 31, 2025
Aug. 31, 2025
C000131659_0_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.14%    
C000131659_0_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   (0.68%)  
C000131659_0_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     1.80%
C000239880_0_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.14%    
C000239880_0_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.29%    
C000235242_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.14%    
C000235242_1_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.22%    
C000235241_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.14%    
C000235241_1_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.22%    
C000201028_2_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.14%    
C000201028_2_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   (0.68%)  
C000201028_2_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 1.92%    
C000131661_2_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.14%    
C000131661_2_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   (0.68%)  
C000131661_2_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     1.80%
C000225827_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.14%    
C000225827_1_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent (0.39%)    
C000225826_0_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.14%    
C000225826_0_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent (0.39%)    
C000125598_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.14%    
C000125598_1_BBIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   (0.68%)  
C000125598_1_BBIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     1.80%
C000248144_1_BBIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.14%    
C000248144_1_BBIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 5.58%    
C000131659_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.88%    
C000131659_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   0.36%  
C000131659_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     2.71%
C000239880_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.25%    
C000239880_NoLoadClassMember_2024-09-01_2025-08-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.50%    
C000235242_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.87%    
C000235242_NoLoadClassMember_2024-09-01_2025-08-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.48%    
C000235242_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.29%    
C000235242_0_AdditionalIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.75%    
C000235241_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.92%    
C000235241_NoLoadClassMember_2024-09-01_2025-08-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.70%    
C000235241_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.17%    
C000235241_0_AdditionalIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.24%    
C000201028_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 5.22%    
C000201028_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   3.06%  
C000201028_NoLoadClassMember_2024-09-01_2025-08-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.11%    
C000201028_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 5.29%    
C000201028_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   3.23%  
C000201028_0_AdditionalIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.31%    
C000201028_1_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.29%    
C000201028_1_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   2.47%  
C000201028_1_AdditionalIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.40%    
C000131661_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 5.65%    
C000131661_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   1.88%  
C000131661_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     2.49%
C000131661_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.79%    
C000131661_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   1.33%  
C000131661_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     2.01%
C000131661_1_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 5.49%    
C000131661_1_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   1.84%  
C000131661_1_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     2.49%
C000225827_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.66%    
C000225827_NoLoadClassMember_2024-09-01_2025-08-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent (0.28%)    
C000225827_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.52%    
C000225827_0_AdditionalIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent (0.29%)    
C000225826_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.18%    
C000225826_NoLoadClassMember_2024-09-01_2025-08-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent (0.10%)    
C000125598_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.30%    
C000125598_NoLoadClassMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   0.28%  
C000125598_NoLoadClassMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     3.21%
C000125598_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.92%    
C000125598_0_AdditionalIndexMember_5YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent   (0.01%)  
C000125598_0_AdditionalIndexMember_10YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent     2.91%
C000248144_NoLoadClassMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 5.01%    
C000248144_NoLoadClassMember_2024-09-01_2025-08-31Member      
Average Annual Return [Line Items]      
Average Annual Return, Percent 5.30%    
C000248144_0_AdditionalIndexMember_1YRMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.29%    
C000248144_0_AdditionalIndexMember_LOCMember      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.70%