S000011985 [Member] Investment Objectives and Goals - BATS: Interest Rate Hedge Series |
Mar. 31, 2026 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund Overview Key Facts About BATS: Interest Rate Hedge Series |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of the BATS: Interest Rate Hedge Series (formerly known as “BATS: Series P Portfolio”) (the “Fund”) is to seek to provide a duration that is the inverse of its benchmark.
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