v3.25.4
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 104 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
C000234545      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name FS Multi-Strategy Alternatives Fund, Class I Shares    
Without Sales Load [Member] | C000234546      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.06% 5.95% 3.51%
Without Sales Load [Member] | C000234545      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.31% 6.22% 3.76%
S&P 500 Index (USD) (TR)      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name [1] S&P 500 Index (USD) (TR)    
Average Annual Return, Percent 17.88% 14.42% 14.80%
S&P 500 Index (USD) (TR)      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name [2] S&P 500 Index (USD) (TR)    
Average Annual Return, Percent 17.88% 14.42% 14.80%
ICE BofA U.S. 3-Month Treasury Bill Index (USD)      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name ICE BofA U.S. 3-Month Treasury Bill Index (USD)    
Average Annual Return, Percent 4.18% 3.17% 2.47%
HFR (HFRX) Global Hedge Fund Index (USD) (TR)      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name [1] HFR (HFRX) Global Hedge Fund Index (USD) (TR)    
Average Annual Return, Percent 7.14% 2.87% 3.00%
ICE BofA U.S. 3-Month Treasury Bill Index (USD)      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name ICE BofA U.S. 3-Month Treasury Bill Index (USD)    
Average Annual Return, Percent 4.18% 3.17% 2.47%
HFR (HFRX) Global Hedge Fund Index (USD) (TR)      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name [2] HFR (HFRX) Global Hedge Fund Index (USD) (TR)    
Average Annual Return, Percent 7.14% 2.87% 3.00%
[1] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.
[2] Total Return (TR) - Reflects no deductions for fees, expenses or taxes.