SA American Century Inflation Protection Portfolio Fees and Expenses - SA American Century Inflation Protection Portfolio	Mar. 31, 2025
Prospectus [Line Items]
Expense Heading [Optional Text]	<span style="color:#000000;font-family:Arial;font-size:12pt;font-style:italic;font-weight:bold;">Fees and Expenses of the Portfolio</span>
Expense Narrative [Text Block]	This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Portfolio. The table and the example below do not reflect the separate account fees charged in the variable annuity or variable life insurance policy (“Variable Contracts”) in which the Portfolio is offered. If separate account fees were shown, the Portfolio’s annual operating expenses would be higher. Please see your Variable Contract prospectus for more details on the separate account fees.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]	<span style="color:#000000;font-family:Arial;font-size:8pt;">The Total Annual Portfolio Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Financial Highlights table, which reflects operating expenses of the Portfolio and does not include Acquired Fund Fees and Expenses.</span>
Operating Expenses Caption [Optional Text]	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0%;text-decoration:underline;">Annual Portfolio Operating Expenses</span><span style="color:#000000;font-family:Arial;font-size:10pt;"> (expenses that </span><span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:0%;">you pay each year as a percentage of the value of your </span><span style="color:#000000;font-family:Arial;font-size:10pt;">investment)</span>
Expense Example [Heading]	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-decoration:underline;">Expense Example</span>
Expense Example Narrative [Text Block]	This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated and then redeem or hold 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 Portfolio’s operating expenses remain the same (except that the Example incorporates any applicable fee waiver and/or expense limitation arrangements for only the first year). The Example does not reflect charges imposed by the Variable Contract. If the Variable Contract fees were reflected, the expenses would be higher. See the Variable Contract prospectus for information on such charges. Although your actual costs may be higher or lower, based on these assumptions and the net expenses shown in the fee table, your costs would be:
Portfolio Turnover [Heading]	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-decoration:underline;">Portfolio Turnover</span>
Portfolio Turnover [Text Block]	The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Portfolio’s performance.During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 48% of the average value of its portfolio.
Portfolio Turnover, Rate	48.00%

SA American Century Inflation Protection Portfolio Fees and Expenses - SA American Century Inflation Protection Portfolio

Mar. 31, 2025

Fees and Expenses of the Portfolio

Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Portfolio. The table and the example below do not reflect the separate account fees charged in the variable annuity or variable life insurance policy (“Variable Contracts”) in which the Portfolio is offered. If separate account fees were shown, the Portfolio’s annual operating expenses would be higher. Please see your Variable Contract prospectus for more details on the separate account fees.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

The Total Annual Portfolio Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Financial Highlights table, which reflects operating expenses of the Portfolio and does not include Acquired Fund Fees and Expenses.

Operating Expenses Caption [Optional Text]

Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Expense Example [Heading]

Expense Example

Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated and then redeem or hold 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 Portfolio’s operating expenses remain the same (except that the Example incorporates any applicable fee waiver and/or expense limitation arrangements for only the first year). The Example does not reflect charges imposed by the Variable Contract. If the Variable Contract fees were reflected, the expenses would be higher. See the Variable Contract prospectus for information on such charges. Although your actual costs may be higher or lower, based on these assumptions and the net expenses shown in the fee table, your costs would be:

Portfolio Turnover [Heading]

Portfolio Turnover

Portfolio Turnover [Text Block]

The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in annual portfolio operating expenses or in the Example, affect the Portfolio’s performance.During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 48% of the average value of its portfolio.

Portfolio Turnover, Rate

48.00%