v3.26.1
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 15 Months Ended 20 Months Ended 36 Months Ended 49 Months Ended 60 Months Ended 73 Months Ended 98 Months Ended 105 Months Ended 108 Months Ended 117 Months Ended 120 Months Ended
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C000154646                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal Active High Yield ETF $17,425                      
C000259043                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal Capital Appreciation Select ETF $13,286                      
C000243208                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal Focused Blue Chip ETF $14,630                      
C000254970                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal International Equity ETF $14,543                      
C000199630                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal Investment Grade Corporate ETF $12,490                      
C000166474                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal Quality ETF $32,536                      
C000235507                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal Real Estate Active Opportunities ETF $12,075                      
C000219817                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal Spectrum Preferred and Income ETF $13,310                      
C000172043                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal Spectrum Preferred Securities Active ETF $14,503                      
C000193921                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal U.S. Mega-Cap ETF $33,896                      
C000173454                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal U.S. Small-Cap ETF $31,446                      
C000166475                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Principal Value ETF $28,241                      
Without Sales Load [Member] | C000154646                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent 6.06%         4.85%           5.71%
Without Sales Load [Member] | C000259043                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent 23.86% 25.16%                    
Without Sales Load [Member] | C000243208                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent (1.28%)     13.66%                
Without Sales Load [Member] | C000254970                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent 24.36%   25.10%                  
Without Sales Load [Member] | C000199630                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent 4.66%         (0.07%)   2.73%        
Without Sales Load [Member] | C000166474                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent 3.68%         8.36%           12.52%
Without Sales Load [Member] | C000235507                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent 10.04%       4.69%              
Without Sales Load [Member] | C000219817                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent 6.76%         3.27% 4.82%          
Without Sales Load [Member] | C000172043                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent 6.03%         3.12%       4.24%    
Without Sales Load [Member] | C000193921                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent 19.51%         14.82%     15.03%      
Without Sales Load [Member] | C000173454                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent 32.54%         9.58%         12.43%  
Without Sales Load [Member] | C000166475                        
Average Annual Return [Line Items]                        
Average Annual Return, Percent 11.32%         7.77%           10.94%
Principal ETF Index: Bloomberg US Aggregate Bond Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Bloomberg US Aggregate Index $11,656                      
Average Annual Return, Percent 3.79%         0.08%           1.54%
Principal ETF Index: Russell 1000 Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Russell 1000 Index $13,149                      
Average Annual Return, Percent 22.02% 24.14%                    
Principal ETF Index: Russell 1000 Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Russell 1000 Index $17,354                      
Average Annual Return, Percent 22.02%     20.40%                
Principal ETF Index: MSCI ACWI Ex USA Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name MSCI ACWI Ex USA Index $14,460                      
Average Annual Return, Percent 27.66%   25.06%                  
Principal ETF Index: Bloomberg US Aggregate Bond Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Bloomberg US Aggregate Index $11,765                      
Average Annual Return, Percent 3.79%         0.08%   2.00%        
Principal ETF Index: S&P 500 Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name S&P 500 Index $42,271                      
Average Annual Return, Percent 22.32%         13.41%           15.51%
Principal ETF Index: Russell 3000 Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Russell 3000 Index $20,028                      
Average Annual Return, Percent 22.82%       18.37%              
Principal ETF Index: Bloomberg Global Aggregate Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Bloomberg Global Aggregate Index $9,504                      
Average Annual Return, Percent 0.62%         (1.55%) (0.84%)          
Principal ETF Index: Bloomberg Global Aggregate Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Bloomberg Global Aggregate Index $10,682                      
Average Annual Return, Percent 0.62%         (1.55%)       0.74%    
Principal ETF Index: S&P 500 Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name S&P 500 Index $33,813                      
Average Annual Return, Percent 22.32%         13.41%     15.00%      
Principal ETF Index: Russell 3000 Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Russell 3000 Index $39,091                      
Average Annual Return, Percent 22.82%         12.31%         14.97%  
Principal ETF Index: S&P 500 Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name S&P 500 Index $42,271                      
Average Annual Return, Percent 22.32%         13.41%           15.51%
Principal ETF Index: Bloomberg US Corporate High Yield 2% Issuer Capped Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Bloomberg US Corporate High Yield 2% Issuer Capped Index $17,582                      
Average Annual Return, Percent 5.91%         4.17%           5.80%
Principal ETF Index: Russell 1000 Growth                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Russell 1000 Growth Index $18,331                      
Average Annual Return, Percent 17.71%     22.64%                
Principal ETF Index: Bloomberg US Corporate Investment Grade Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Bloomberg US Corporate Investment Grade Index $12,646                      
Average Annual Return, Percent 4.34%         0.34%   2.90%        
Principal ETF Index: S&P 500 Growth Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name S&P 500 Growth Index $47,382                      
Average Annual Return, Percent 24.96%         13.60%           16.83%
Principal ETF Index: FTSE NAREIT All Equity REIT Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name FTSE NAREIT All Equity REIT Index $12,409                      
Average Annual Return, Percent 15.43%       5.38%              
Principal ETF Index: ICE BofA 7% Constrained DRD Eligible Preferred Securities Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name ICE BofA 7% Constrained DRD Eligible Preferred Securities Index $11,922                      
Average Annual Return, Percent 4.49%         1.15% 2.95%          
Principal ETF Index: ICE BofA US Investment Grade Institutional Capital Securities Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name ICE BofA US Investment Grade Institutional Capital Securities Index $15,374                      
Average Annual Return, Percent 6.29%         3.76%       4.91%    
Principal ETF Index: Russell 2000 Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name Russell 2000 Index $27,710                      
Average Annual Return, Percent 40.78%         6.98%         10.99%  
Principal ETF Index: S&P 500 Value Index                        
Average Annual Return [Line Items]                        
Line Graph and Table Measure Name S&P 500 Value Index $24,402                      
Average Annual Return, Percent 16.16%         8.97%           9.33%