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DEBT - Credit Facilities (Details)
$ in Millions
 12 Months Ended
Nov. 21, 2025
USD ($)
Apr. 08, 2022
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2028
Sep. 30, 2027
Sep. 30, 2026
Sep. 30, 2023
Debt Instrument [Line Items]                
Debt, weighted average interest rate (percentage)     5.30% 5.80%       5.40%
Leverage ratio     4.10          
Fixed charge coverage ratio     1.42          
Debt Instrument, Redemption, Period One                
Debt Instrument [Line Items]                
Maximum leverage ratio     4.75          
Fixed charge coverage ratio, minimum     1.00          
Sixth Amended And Restated Senior Secured Credit Agreement                
Debt Instrument [Line Items]                
Debt, maturity period (in years)   5 years            
Maximum borrowing capacity   $ 2,500.0            
Credit Facilities                
Debt Instrument [Line Items]                
Senior secured credit facilities, available borrowing capacity     $ 1,166.9          
Credit Facilities | Seventh Amended And Restated Senior Secured Credit Agreement | Subsequent Event                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 2,000.0              
Maximum leverage ratio 5.00              
Debt term (in years) 5 years              
Line of credit facility, accordion feature, increase limit $ 500.0              
Debt instrument, covenant, leverage ratio, restricted payments 4.00              
Debt instrument, covenant, annual restricted payment amount, maximum if leverage threshold exceeded $ 225.0              
Credit Facilities | Seventh Amended And Restated Senior Secured Credit Agreement | Scenario, Forecast                
Debt Instrument [Line Items]                
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum         3.50 3.25 3.00  
Revolving loans                
Debt Instrument [Line Items]                
Debt, weighted average interest rate (percentage)     7.90% 9.10%       7.60%
Revolving loans | Credit Facilities | Seventh Amended And Restated Senior Secured Credit Agreement | Subsequent Event                
Debt Instrument [Line Items]                
Maximum borrowing capacity 1,500.0              
Letter of Credit | Credit Facilities                
Debt Instrument [Line Items]                
Aggregate face amount of letters of credit outstanding     $ 83.1          
Letter of Credit | Credit Facilities | Seventh Amended And Restated Senior Secured Credit Agreement | Subsequent Event                
Debt Instrument [Line Items]                
Maximum borrowing capacity 100.0              
Term loans | Credit Facilities                
Debt Instrument [Line Items]                
Repayments of debt     $ 75.0 $ 250.0        
Term loans | Credit Facilities | Seventh Amended And Restated Senior Secured Credit Agreement | Subsequent Event                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 500.0              
Revolving loans | Sixth Amended And Restated Senior Secured Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity   1,500.0            
Secured Term Loan | Sixth Amended And Restated Senior Secured Credit Agreement                
Debt Instrument [Line Items]                
Maximum borrowing capacity   $ 1,000.0