v3.25.4
First Trust Preferred Securities and Income Fund Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 178 Months Ended 180 Months Ended
Oct. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
ICE BofA US Investment Grade Institutional Capital Securities Index (reflects no deduction for fees, expenses or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   8.64% 3.77% 5.49%     6.03%
Performance Inception Date [1] Jan. 11, 2011            
FPEIX Blended Index (reflects no deduction for fees, expenses or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1],[2],[3]   7.72% 2.41% 4.89%    
Performance Inception Date [1],[2],[3] Jan. 11, 2011            
Bloomberg US Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   7.30% (0.36%) 2.01%     2.42%
Performance Inception Date [1] Jan. 11, 2011            
C | Return Before Taxes[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent   7.24% 2.47% 4.21%   4.71%  
Performance Inception Date Feb. 25, 2011            
F | Return Before Taxes[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent   9.09% 3.29% 5.06%   5.59%  
Performance Inception Date Mar. 02, 2011            
I | Return Before Taxes[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent   9.46% 3.55% 5.26% 5.82%    
Performance Inception Date Jan. 11, 2011            
R3 | Return Before Taxes[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent   8.80% 2.92% 4.66%     5.11%
Performance Inception Date Mar. 02, 2011            
A | After Taxes on Distributions              
Prospectus [Line Items]              
Average Annual Return, Percent   2.36% 0.48% 2.43%   3.00%  
Performance Inception Date Feb. 25, 2011            
A | After Taxes on Distributions and Sales              
Prospectus [Line Items]              
Average Annual Return, Percent   2.87% 1.07% 2.57%   3.05%  
Performance Inception Date Feb. 25, 2011            
A | Return Before Taxes[Member]              
Prospectus [Line Items]              
Average Annual Return, Percent   4.09% 2.26% 4.47% 5.13%    
Performance Inception Date Feb. 25, 2011            
[1] Since inception return is based on the Class I Shares inception date.
[2] Since the ICE USD Contingent Capital Index had an inception date of December 31, 2013, the performance of the Blended Index is not available for all of the periods disclosed.
[3] The Blended Index consists of a 30/30/30/10 blend of the ICE BofA Core Plus Fixed Rate Preferred Securities Index, the ICE BofA US Investment Grade Institutional Capital Securities Index, the ICE USD Contingent Capital Index and the ICE BofA US High Yield Institutional Capital Securities Index.