v3.26.1
Summary of Significant Accounting Policies - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 4 Months Ended 6 Months Ended 10 Months Ended 12 Months Ended
Feb. 09, 2026
shares
Feb. 09, 2026
USD ($)
shares
Feb. 06, 2026
$ / shares
shares
Dec. 31, 2025
USD ($)
customer
Dec. 31, 2024
USD ($)
Oct. 31, 2023
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Accounting Policies [Line Items]                    
Percentage Of Equity Owned By Non Controlling Interest                   31.00%
Percentage Of Net Income                   31.00%
Amount Of Black Line Adjustment               $ 76,400    
Amount Related To Employee Bonus               65,500    
Amount Related To Investment Banker Fees               10,900    
Unbilled receivables                 $ 1,800 $ 12,500
Cost of Revenue       $ 194,648 $ 111,583 $ 3,100 $ 379,970 $ 199,151 6,900 19,000
Accrued Warranty Reserve                 $ 1,200 2,700
Reallocation of member's equity to the non-controlling members                   125,700
Revenue Benchmark [Member] | One Customer [Member] | Customer Concentration Risk                    
Accounting Policies [Line Items]                    
Concentration Risk, Percentage           12.00%        
Revenue from Contract with Customer Benchmark                    
Accounting Policies [Line Items]                    
Number of major customers | customer       1            
Revenue from Contract with Customer Benchmark | One Customer [Member] | Customer Concentration Risk                    
Accounting Policies [Line Items]                    
Concentration Risk, Percentage       12.00%            
Accounts Receivable | One Customer [Member] | Customer Concentration Risk                    
Accounting Policies [Line Items]                    
Concentration Risk, Percentage       6.00%            
Opco LLC                    
Accounting Policies [Line Items]                    
Increase in the deferred tax liability                   $ 25,600
Subsequent Event | IPO | Selling Stockholders                    
Accounting Policies [Line Items]                    
Number of shares issued (in shares) | shares     39,413,573              
Subsequent Event | Over-Allotment Option | Selling Stockholders                    
Accounting Policies [Line Items]                    
Number of shares issued (in shares) | shares 5,912,036                  
Forgent Power Solutions, Inc. | Subsequent Event                    
Accounting Policies [Line Items]                    
Net proceeds from stock issued   $ 491,800                
Forgent Power Solutions, Inc. | Subsequent Event | Opco LLC                    
Accounting Policies [Line Items]                    
Capital ownership interests purchased (in shares) | shares 19,074,391 19,074,391                
Indirectly owned economic interests 76.65% 76.65%                
Forgent Power Solutions, Inc. | Subsequent Event | IPO                    
Accounting Policies [Line Items]                    
Number of shares issued (in shares) | shares     16,586,427              
Price per share (in dollars per share) | $ / shares     $ 27              
Forgent Power Solutions, Inc. | Subsequent Event | IPO | Selling Stockholders                    
Accounting Policies [Line Items]                    
Number of shares issued (in shares) | shares     39,413,573              
Forgent Power Solutions, Inc. | Subsequent Event | Over-Allotment Option                    
Accounting Policies [Line Items]                    
Number of shares issued (in shares) | shares 2,487,964                  
Forgent Power Solutions, Inc. | Subsequent Event | Over-Allotment Option | Selling Stockholders                    
Accounting Policies [Line Items]                    
Number of shares issued (in shares) | shares 5,912,036