S000001470 [Member] Investment Objectives and Goals - BATS: Mortgage Total Return Series |
Mar. 31, 2026 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund Overview Key Facts About BATS: Mortgage Total Return Series |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of the BATS: Mortgage Total Return Series (formerly known as “BATS: Series M Portfolio”) (the “Fund”) is to seek to maximize total return, consistent with income generation and prudent investment management.
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