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DEBT - Credit Facilities (Details)
$ in Millions
Jul. 31, 2023
USD ($)
Apr. 08, 2022
USD ($)
Jul. 05, 2018
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
Jun. 08, 2022
Sep. 30, 2021
Debt Instrument [Line Items]              
Debt, weighted average interest rate (percentage)       5.40% 3.60%   3.70%
Fixed charge coverage ratio       1.56      
Debt Instrument, Redemption, Period One              
Debt Instrument [Line Items]              
Maximum leverage ratio       7.75      
Fixed charge coverage ratio, minimum       0.75      
Debt Instrument, Redemption, Period Two              
Debt Instrument [Line Items]              
Maximum leverage ratio       8.25      
Fixed charge coverage ratio, minimum       1.00      
Debt Instrument, Redemption, Period Three              
Debt Instrument [Line Items]              
Maximum leverage ratio       7.75      
Debt Instrument, Redemption, Period Four              
Debt Instrument [Line Items]              
Maximum leverage ratio       6.50      
Debt Instrument, Redemption, Period Five              
Debt Instrument [Line Items]              
Maximum leverage ratio       6.00      
Debt Instrument, Redemption, Period Six              
Debt Instrument [Line Items]              
Maximum leverage ratio       5.50      
Debt Instrument, Redemption, Period Seven              
Debt Instrument [Line Items]              
Maximum leverage ratio       5.25      
Debt Instrument, Redemption, Period Eight              
Debt Instrument [Line Items]              
Maximum leverage ratio       5.00      
Debt Instrument, Redemption, Period Nine              
Debt Instrument [Line Items]              
Maximum leverage ratio       4.75      
Debt Instrument, Redemption, Period Ten              
Debt Instrument [Line Items]              
Maximum leverage ratio       4.50      
Fifth Amended And Restated Senior Secured Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity     $ 2,300.0        
Leverage ratio       6.57      
Sixth Amended And Restated Senior Secured Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 2,500.0          
Outstanding debt       $ 2,613.3      
Credit Facilities              
Debt Instrument [Line Items]              
Senior secured credit facilities, available borrowing capacity       $ 1,156.7      
Credit Facilities | Fifth Amended And Restated Senior Secured Credit Agreement              
Debt Instrument [Line Items]              
Debt, maturity period (in years)     5 years        
Credit Facilities | Sixth Amended And Restated Senior Secured Credit Agreement              
Debt Instrument [Line Items]              
Debt, maturity period (in years)   5 years          
Revolving loans              
Debt Instrument [Line Items]              
Debt, weighted average interest rate (percentage)       7.60% 2.80%   1.90%
Revolving loans | Sixth Amended And Restated Senior Secured Credit Agreement, Amendment One              
Debt Instrument [Line Items]              
Interest rate, increase (decrease)           35  
Annual facility fee rate increase (decrease)           15  
Maximum leverage ratio           4.75  
Cash dividends, annual maximum $ 225.0            
Maximum other dividends and distributions 25.0            
Revolving loans | Sixth Amended And Restated Senior Secured Credit Agreement, Amendment Two              
Debt Instrument [Line Items]              
Line Of Credit Facility, Commitment, Increase (Decrease) $ 250.0            
Debt Instrument, Interest Rate, Increase (Decrease) 2500.00%            
Debt Instrument, Covenant, Leverage Ratio, Minimum Threshold For Additional Pricing Tier 6.00            
Debt Instrument, Covenant, Incremental Investments, Loans, And Advances, Maximum $ 25.0            
Letter of Credit | Credit Facilities              
Debt Instrument [Line Items]              
Aggregate face amount of letters of credit outstanding       $ 5.0      
Revolving loans | Fifth Amended And Restated Senior Secured Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity     $ 1,500.0        
Revolving loans | Sixth Amended And Restated Senior Secured Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 1,500.0          
Letters of credit   100.0          
Secured Term Loan | Fifth Amended And Restated Senior Secured Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity     $ 800.0        
Secured Term Loan | Sixth Amended And Restated Senior Secured Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 1,000.0          
Secured Term Loan | Sixth Amended And Restated Senior Secured Credit Agreement, Amendment One              
Debt Instrument [Line Items]              
Interest rate, increase (decrease)           50