000000 - Document - Document and Entity Information
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000011 - Document - Risk/Return Supplement {Unlabeled} - Spartan Extended Market Index Fund (Adv Inv)
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000012 - Schedule - Shareholder Fees {- Spartan Extended Market Index Fund}
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000013 - Schedule - Annual Fund Operating Expenses {- Spartan Extended Market Index Fund}
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000014 - Schedule - Expense Example {Transposed} {- Spartan Extended Market Index Fund}
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000015 - Schedule - Expense Example, No Redemption {Transposed} {- Spartan Extended Market Index Fund}
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000016 - Schedule - Annual Total Returns - Spartan Extended Market Index Fund [BarChart]
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000017 - Schedule - Average Annual Total Returns {Transposed} {- Spartan Extended Market Index Fund}
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000018 - Document - Risk/Return Detail {Unlabeled} - Spartan Extended Market Index Fund
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000019 - Disclosure - Risk/Return Detail Data {Elements} - Spartan Extended Market Index Fund (Adv Inv)
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000021 - Document - Risk/Return Supplement {Unlabeled} - Spartan International Index Fund (Adv Inv)
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000022 - Schedule - Shareholder Fees {- Spartan International Index Fund}
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000023 - Schedule - Annual Fund Operating Expenses {- Spartan International Index Fund}
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000024 - Schedule - Expense Example {Transposed} {- Spartan International Index Fund}
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000025 - Schedule - Expense Example, No Redemption {Transposed} {- Spartan International Index Fund}
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000026 - Schedule - Annual Total Returns - Spartan International Index Fund [BarChart]
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000027 - Schedule - Average Annual Total Returns {Transposed} {- Spartan International Index Fund}
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000028 - Document - Risk/Return Detail {Unlabeled} - Spartan International Index Fund
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000029 - Disclosure - Risk/Return Detail Data {Elements} - Spartan International Index Fund (Adv Inv)
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000031 - Document - Risk/Return Supplement {Unlabeled} - Spartan Total Market Index Fund (Adv Inv)
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000032 - Schedule - Shareholder Fees {- Spartan Total Market Index Fund}
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000033 - Schedule - Annual Fund Operating Expenses {- Spartan Total Market Index Fund}
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000034 - Schedule - Expense Example {Transposed} {- Spartan Total Market Index Fund}
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000035 - Schedule - Expense Example, No Redemption {Transposed} {- Spartan Total Market Index Fund}
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000036 - Schedule - Annual Total Returns - Spartan Total Market Index Fund [BarChart]
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000037 - Schedule - Average Annual Total Returns {Transposed} {- Spartan Total Market Index Fund}
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000038 - Document - Risk/Return Detail {Unlabeled} - Spartan Total Market Index Fund
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000039 - Disclosure - Risk/Return Detail Data {Elements} - Spartan Total Market Index Fund (Adv Inv)
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000041 - Document - Risk/Return Supplement {Unlabeled} - Spartan Extended Market Index Fund (Inst Adv Inst)
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000043 - Schedule - Annual Fund Operating Expenses {- Spartan Total Market Index Fund Inst Adv Inst}
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000049 - Disclosure - Risk/Return Detail Data {Elements} - Spartan Extended Market Index Fund (Inst Adv Inst)
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000051 - Document - Risk/Return Supplement {Unlabeled} - Spartan International Index Fund (Inst Adv Inst)
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000059 - Disclosure - Risk/Return Detail Data {Elements} - Spartan International Index Fund (Inst Adv Inst)
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000061 - Document - Risk/Return Supplement {Unlabeled} - Spartan Total Market Index Fund (Inst Adv Inst)
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000062 - Schedule - Shareholder Fees {- Spartan Total Market Index Fund Institutional & Adv Ins}
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000063 - Schedule - Annual Fund Operating Expenses {- Spartan Total Market Index Fund Institutionals & Adv Ins}
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000064 - Schedule - Expense Example {Transposed} {- Spartan Total Market Index Fund Institutional & Adv Ins}
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000065 - Schedule - Expense Example, No Redemption {Transposed} {- Spartan Total Market Index Fund Institutional & Adv Ins}
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000066 - Schedule - Annual Total Returns - Spartan Total Market Index Fund Institutional & Adv Ins [BarChart]
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000067 - Schedule - Average Annual Total Returns {Transposed} {- Spartan Total Market Index Fund Institutional & Adv Ins}
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000068 - Document - Risk/Return Detail {Unlabeled} - Spartan Total Market Index Fund Institutional & Adv Ins
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000069 - Disclosure - Risk/Return Detail Data {Elements} - Spartan Total Market Index Fund (Inst Adv Inst)
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000071 - Document - Risk/Return Supplement {Unlabeled} - Spartan 500 Index Fund (Inst Adv Inst)
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000072 - Schedule - Shareholder Fees {- Spartan 500 Index Fund}
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000073 - Schedule - Annual Fund Operating Expense {- Spartan 500 Index Fund}
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000074 - Schedule - Expense Example {Transposed} {- Spartan 500 Index Fund}
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000075 - Schedule - Expense Example, No Redemption {Transposed} {- Spartan 500 Index Fund}
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000076 - Schedule - Annual Total Returns - Spartan 500 Index Fund [BarChart]
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000077 - Schedule - Average Annual Total Returns {Transposed} {- Spartan 500 Index Fund}
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000078 - Document - Risk/Return Detail {Unlabeled} - Spartan 500 Index Fund
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000079 - Disclosure - Risk/Return Detail Data {Elements} - Spartan 500 Index Fund (Inst Adv Inst)
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000081 - Document - Risk/Return Supplement {Unlabeled} - Spartan 500 Index Fund (Adv Inv)
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000082 - Schedule - Shareholder Fees {- Spartan 500 Index Fund Investor & Advantage}
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000083 - Schedule - Annual Fund Operating Expenses {- Spartan 500 Index Fund Investor & Advantage}
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000084 - Schedule - Expense Example {Transposed} {- Spartan 500 Index Fund Investor & Advantage}
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000085 - Schedule - Expense Example, No Redemption {Transposed} {- Spartan 500 Index Fund Investor & Advantage}
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000086 - Schedule - Annual Total Returns - Spartan 500 Index Fund Investor & Advantage [BarChart]
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000087 - Schedule - Average Annual Total Returns {Transposed} {- Spartan 500 Index Fund Investor & Advantage}
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000088 - Document - Risk/Return Detail {Unlabeled} - Spartan 500 Index Fund Investor & Advantage
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000089 - Disclosure - Risk/Return Detail Data {Elements} - Spartan 500 Index Fund (Adv Inv)
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