Summary of Significant Accounting Policies (FPS) (Details) - Subsequent Event - USD ($) $ / shares in Units, $ in Millions	Feb. 09, 2026	Feb. 09, 2026	Feb. 06, 2026
IPO \| Selling Stockholders
Accounting Policies [Line Items]
Number of shares issued (in shares)			39,413,573
Over-Allotment Option \| Selling Stockholders
Accounting Policies [Line Items]
Number of shares issued (in shares)	5,912,036
Forgent Power Solutions, Inc.
Accounting Policies [Line Items]
Net proceeds from stock issued		$ 491.8
Forgent Power Solutions, Inc. \| Opco LLC
Accounting Policies [Line Items]
Capital ownership interests purchased (in shares)	19,074,391	19,074,391
Indirectly owned economic interests	76.65%	76.65%
Forgent Power Solutions, Inc. \| IPO
Accounting Policies [Line Items]
Number of shares issued (in shares)			16,586,427
Price per share (in dollars per share)			$ 27.00
Forgent Power Solutions, Inc. \| IPO \| Selling Stockholders
Accounting Policies [Line Items]
Number of shares issued (in shares)			39,413,573
Forgent Power Solutions, Inc. \| Over-Allotment Option
Accounting Policies [Line Items]
Number of shares issued (in shares)	2,487,964
Forgent Power Solutions, Inc. \| Over-Allotment Option \| Selling Stockholders
Accounting Policies [Line Items]
Number of shares issued (in shares)	5,912,036