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Poplar Forest Partners Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Poplar Forest Partners Fund
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
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Poplar Forest Partners Fund

Class A
PFPFX
Institutional Class
IPFPX

Supplement to the Prospectus dated January 28, 2020,
as supplemented on January 7, 2021

Effective January 1, 2021, the investment advisory fee for the Poplar Forest Partners Fund is reduced to 0.85% for the first $250 million of assets, 0.775% for the next $750 million of assets, and 0.70% for assets in excess of $1 billion of the Fund’s average daily net assets. The expense cap has also been reduced to 0.95%. References to the investment advisory fee and the expense cap throughout the statutory prospectus are hereby revised as follows.

Prospectus

The following replaces the “Fees and Expenses of the Fund” section on page 1 of the prospectus:
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold Class A shares and Institutional Class shares of the Partners Fund. You may be required to pay commissions and/or other forms of compensation to a broker for transactions in Institutional Class Shares, which are not reflected in the tables or the examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund’s Class A shares. Certain financial intermediaries also may offer variations in Fund sales charges to their customers as described in Appendix A to the statutory Prospectus. More information about these and other discounts is available from your financial professional and in the “Shareholder Information” section on page 21 of the Fund’s statutory Prospectus, the “More About Class A Shares” section on page 32 of the Fund’s statutory Prospectus, the “Breakpoints/Volume Discounts and Sales Charge Waivers” section on page 33 of the Fund’s Statement of Additional Information (“SAI”), and Appendix A to the Statutory Prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination January 27, 2022
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Management fees have been restated to reflect a reduction in fees effective January 1, 2021.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses do not correlate to the Ratio of Expenses to Average Net Assets in the Financial Highlights section of the statutory prospectus, which reflects the operating expenses of the Fund and does not include expenses of 0.01% attributed to acquired fund fees and expenses ("AFFE") as well as the reduction in Management Fees effective January 1, 2021.
Expense Example [Heading] rr_ExpenseExampleHeading Example.
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Partners Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same (taking into account the Expense Cap only in the first year).
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Supplement Closing [Text Block] ck0001027596_SupplementClosingTextBlock
Please retain this Supplement with your Prospectus.
The date of this Supplement is January 7, 2021.
Poplar Forest Partners Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol PFPFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.33% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.21%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund’s Class A shares.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 617
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 889
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,181
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,011
Poplar Forest Partners Fund | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol IPFPX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.85% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.22%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.08% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 332
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 584
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,306
[1] Management fees have been restated to reflect a reduction in fees effective January 1, 2021.
[2] Total Annual Fund Operating Expenses do not correlate to the Ratio of Expenses to Average Net Assets in the Financial Highlights section of the statutory prospectus, which reflects the operating expenses of the Fund and does not include expenses of 0.01% attributed to acquired fund fees and expenses ("AFFE") as well as the reduction in Management Fees effective January 1, 2021.
[3] Poplar Forest Capital LLC (the “Adviser”) has contractually agreed to waive a portion or all of its management fees and pay Fund expenses (excluding acquired fund fees and expenses (“AFFE”), interest, taxes, extraordinary expenses, Rule 12b-1 fees, shareholder servicing fees, and other class-specific expenses) in order to limit the Total Annual Fund Operating Expenses to 0.95% of average daily net assets of the Fund, (the “Expense Cap”). The Expense Cap will remain in effect through at least January 27, 2022, and may be terminated only by the Fund’s Board of Trustees (the “Board”). The Adviser may request recoupment of previously waived fees and paid expenses from the Fund for 36 months from the date they were waived or paid, subject to the Expense Cap.