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EMPLOYEE BENEFIT PLANS - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 0.4 $ 0.7 $ 0.6
Interest cost 2.4 2.8 2.8
Expected return on assets $ (2.4) $ (2.9) $ (3.1)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other non-operating expense, net Other non-operating expense, net Other non-operating expense, net
Recognized net actuarial loss $ 1.1 $ 0.0 $ 0.0
Recognized net prior service cost 0.0 0.0 0.0
Net periodic benefit cost $ 1.5 $ 0.6 $ 0.3
Weighted average assumptions      
Discount rate     5.37%
Expected return on plan assets 5.25% 5.50% 5.25%
U.S. Plans | Minimum      
Weighted average assumptions      
Discount rate 4.39% 5.56%  
U.S. Plans | Maximum      
Weighted average assumptions      
Discount rate 4.74% 5.72%  
Non U.S. Plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 0.8 $ 0.7 $ 0.8
Interest cost 4.4 5.0 4.6
Expected return on assets $ (4.5) $ (4.5) $ (3.9)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other non-operating expense, net Other non-operating expense, net Other non-operating expense, net
Recognized net actuarial loss $ 0.9 $ 0.9 $ 0.8
Recognized net prior service cost 0.0 0.1 0.0
Net periodic benefit cost $ 1.6 $ 2.2 $ 2.3
Weighted average assumptions      
Rate of compensation increase 2.75% 2.75% 2.75%
Non U.S. Plans | Minimum      
Weighted average assumptions      
Discount rate 3.40% 4.00% 3.70%
Expected return on plan assets 2.54% 2.54% 2.54%
Non U.S. Plans | Maximum      
Weighted average assumptions      
Discount rate 5.10% 5.60% 5.20%
Expected return on plan assets 4.80% 5.00% 5.58%