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RETIREMENT PLANS - Narratives (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, cost recognized $ 45.0 $ 34.0 $ 30.0
Defined Benefit Plan, Plan Assets, Amount 174.0 147.0  
Defined benefit plan, accumulated benefit obligation $ 175.0 152.0  
Equity Securities [Member] | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 35.00%    
Equity Securities [Member] | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 55.00%    
Debt Securities [Member] | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 45.00%    
Debt Securities [Member] | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 65.00%    
Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 0.00%    
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ 1.0 1.0 1.0
UNITED STATES | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 9.0 8.0 9.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 0.0 (8.0) 20.0
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (3.0) $ (4.0)  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 5.20% 5.25%  
Foreign Plan [Member] | Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 165.0 $ 139.0 133.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 3.0 3.0 $ 1.0
Defined Benefit Plan, Funded (Unfunded) Status of Plan $ (3.0) $ (5.0)  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.74% 5.56%