v3.26.1
Cover - shares
 6 Months Ended
Dec. 31, 2025
Mar. 09, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Dec. 31, 2025  
Document Transition Report false  
Entity File Number 001-43102  
Registrant Name Forgent Power Solutions, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 39-3386651  
Entity Address, Address Line One 11500 Dayton Parkway  
Entity Address, City or Town Dayton  
Entity Address, State or Province MN  
Entity Address, Postal Zip Code 55369  
City Area Code 763  
Local Phone Number 588-0536  
Title of 12(b) Security Class A Common Stock, par value $0.00001 per share  
Trading Symbol FPS  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Central Index Key 0002080126  
Current Fiscal Year End Date --06-30  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Common Class A    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   233,335,645
Common Class B    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   71,093,244