Shareholder Report, Average Annual Return (Details)
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12 Months Ended |
60 Months Ended |
120 Months Ended |
Jan. 31, 2026 |
Jan. 31, 2026 |
Jan. 31, 2026 |
| C000048850_1_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.70%
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| C000048850_1_BBIndexMember_5YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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0.86%
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| C000048850_1_BBIndexMember_10YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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2.32%
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| C000235223_1_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.70%
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| C000235223_1_BBIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.98%
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| C000235227_1_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.70%
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| C000235227_1_BBIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.98%
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| C000235224_1_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.70%
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| C000235224_1_BBIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.98%
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| C000235226_1_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.70%
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| C000235226_1_BBIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.98%
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| C000235225_1_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.70%
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| C000235225_1_BBIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.98%
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| C000235228_1_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.70%
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| C000235228_1_BBIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.98%
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| C000131781_1_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
15.31%
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| C000131781_1_BBIndexMember_5YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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14.09%
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| C000131781_1_BBIndexMember_10YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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15.38%
|
| C000200825_1_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.70%
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| C000200825_1_BBIndexMember_5YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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0.86%
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| C000200825_1_BBIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.62%
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| C000235216_1_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.70%
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| C000235216_1_BBIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.98%
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|
| C000235213_2_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.70%
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| C000235213_2_BBIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.95%
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| C000245667_2_BBIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.70%
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| C000245667_2_BBIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.81%
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| C000048850_NoLoadClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.96%
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| C000048850_NoLoadClassMember_5YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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1.04%
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| C000048850_NoLoadClassMember_10YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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2.58%
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| C000048850_0_AdditionalIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.77%
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| C000048850_0_AdditionalIndexMember_5YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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0.72%
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| C000048850_0_AdditionalIndexMember_10YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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2.39%
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| C000235223_NoLoadClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.70%
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| C000235223_NoLoadClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.88%
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| C000235223_0_AdditionalIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.72%
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| C000235223_0_AdditionalIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.37%
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| C000235227_NoLoadClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.76%
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| C000235227_NoLoadClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.94%
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| C000235227_0_AdditionalIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.72%
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| C000235227_0_AdditionalIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.37%
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| C000235224_ClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
1.12%
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| C000235224_ClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.49%
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| C000235224_NoLoadClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.33%
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| C000235224_NoLoadClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.59%
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| C000235224_0_AdditionalIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.72%
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| C000235224_0_AdditionalIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.37%
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| C000235226_NoLoadClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.70%
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| C000235226_NoLoadClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.88%
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| C000235226_0_AdditionalIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.72%
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| C000235226_0_AdditionalIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.37%
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| C000235225_ClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.55%
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| C000235225_ClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.82%
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| C000235225_NoLoadClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.55%
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| C000235225_NoLoadClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.82%
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| C000235225_0_AdditionalIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.72%
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| C000235225_0_AdditionalIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.37%
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| C000235228_ClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
1.12%
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| C000235228_ClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.49%
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| C000235228_NoLoadClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.33%
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| C000235228_NoLoadClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.59%
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| C000235228_0_AdditionalIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.72%
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| C000235228_0_AdditionalIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
3.37%
|
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|
| C000131781_NoLoadClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
15.78%
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| C000131781_NoLoadClassMember_5YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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12.55%
|
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| C000131781_NoLoadClassMember_10YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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11.62%
|
| C000131781_0_AdditionalIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
15.83%
|
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| C000131781_0_AdditionalIndexMember_5YRMember |
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| Average Annual Return [Line Items] |
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|
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| Average Annual Return, Percent |
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12.53%
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| C000131781_0_AdditionalIndexMember_10YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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|
11.61%
|
| C000200825_NoLoadClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.57%
|
|
|
| C000200825_NoLoadClassMember_5YRMember |
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| Average Annual Return [Line Items] |
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|
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| Average Annual Return, Percent |
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1.13%
|
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| C000200825_NoLoadClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
|
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| Average Annual Return, Percent |
2.79%
|
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| C000200825_0_AdditionalIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.77%
|
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|
| C000200825_0_AdditionalIndexMember_5YRMember |
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| Average Annual Return [Line Items] |
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|
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| Average Annual Return, Percent |
|
0.72%
|
|
| C000200825_0_AdditionalIndexMember_LOCMember |
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| Average Annual Return [Line Items] |
|
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| Average Annual Return, Percent |
2.68%
|
|
|
| C000235216_NoLoadClassMember_1YRMember |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.28%
|
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| C000235216_NoLoadClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
3.91%
|
|
|
| C000235216_0_AdditionalIndexMember_1YRMember |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
4.78%
|
|
|
| C000235216_0_AdditionalIndexMember_LOCMember |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
2.99%
|
|
|
| C000235213_NoLoadClassMember_1YRMember |
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| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
3.30%
|
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|
| C000235213_NoLoadClassMember_2025-02-01_2026-01-31Member |
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| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
3.10%
|
|
|
| C000235213_0_AdditionalIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
3.14%
|
|
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| C000235213_0_AdditionalIndexMember_LOCMember |
|
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| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
2.95%
|
|
|
| C000235213_1_AdditionalIndexMember_1YRMember |
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| Average Annual Return [Line Items] |
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|
|
| Average Annual Return, Percent |
3.50%
|
|
|
| C000235213_1_AdditionalIndexMember_LOCMember |
|
|
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| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
2.89%
|
|
|
| C000245667_NoLoadClassMember_1YRMember |
|
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| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
3.24%
|
|
|
| C000245667_NoLoadClassMember_2025-02-01_2026-01-31Member |
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|
|
| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
3.60%
|
|
|
| C000245667_0_AdditionalIndexMember_1YRMember |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
3.14%
|
|
|
| C000245667_0_AdditionalIndexMember_LOCMember |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
3.44%
|
|
|
| C000245667_1_AdditionalIndexMember_1YRMember |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
3.50%
|
|
|
| C000245667_1_AdditionalIndexMember_LOCMember |
|
|
|
| Average Annual Return [Line Items] |
|
|
|
| Average Annual Return, Percent |
3.75%
|
|
|