v3.26.1
LONG-TERM DEBT - Narrative (Details) - USD ($)
 9 Months Ended 12 Months Ended
Jun. 26, 2024
Jun. 30, 2026
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2020
Jun. 25, 2024
Aug. 01, 2023
Jul. 31, 2023
Jan. 24, 2022
Debt Instrument [Line Items]                      
Minimum payments under debt agreements for 2026     $ 8,033,000                
Minimum payments under debt agreements for 2027     8,003,000                
Minimum payments under debt agreements for 2028     982,775,000                
Minimum payments under debt agreements for 2029     425,000,000                
Minimum payments under debt agreements for 2030     0                
Capitalized fees & expenses     11,162,000 $ 15,179,000              
Long-term debt, gross     1,423,811,000 1,539,393,000              
Gain (loss) from debt extinguishment     0 (1,700,000) $ (437,000)            
Revolver due 2028                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity                 $ 500,000,000 $ 400,000,000  
Letters of credit outstanding, amount     14,328,000                
Line of credit facility, remaining borrowing capacity     $ 485,672,000                
Revolver Due 2025, SOFR Loan                      
Debt Instrument [Line Items]                      
Debt instrument, interest rate at period end     5.98%                
Revolver Due 2025, SONIA Loan                      
Debt Instrument [Line Items]                      
Debt instrument, interest rate at period end     5.75%                
Revolver Due 2025, Base Rate Loan                      
Debt Instrument [Line Items]                      
Debt instrument, interest rate at period end     8.00%                
Letter of Credit Subfacility | Revolver due 2028                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity                 125,000,000 100,000,000  
Line of credit facility, incremental minimum borrowing amount                 500,000,000 $ 375,000,000  
Multicurrency Subfacility | Revolver due 2028                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity                 $ 200,000,000    
Senior Notes | Senior Notes due 2028                      
Debt Instrument [Line Items]                      
Debt instrument, face amount             $ 1,000,000,000        
Stated percentage             5.75%        
Capitalized fees & expenses             $ 16,448,000        
Debt instrument, repurchased face amount           $ 25,225,000          
Repurchase of debt instrument, discount rate           91.82%          
Debt instrument, repurchase amount           $ 23,161,000          
Debt issuance costs, net     $ 4,880,000                
Senior Notes | Senior Notes due 2028 | Quoted Prices in Active Markets for Identical Assets (Level 1)                      
Debt Instrument [Line Items]                      
Long-term debt, fair value     972,338,000                
Senior Notes | Term Loan B due 2029                      
Debt Instrument [Line Items]                      
Repayments of debt             $ 1,000,000,000        
Stated percentage             5.25%        
Revolver due 2028                      
Debt Instrument [Line Items]                      
Capitalized fees & expenses     2,113,000 2,859,000              
Long-term debt, gross     0 107,500,000              
Term Loan B due 2029                      
Debt Instrument [Line Items]                      
Capitalized fees & expenses       5,420,000              
Long-term debt, gross     449,000,000 $ 457,000,000              
Term Loan B due 2029 | Quoted Prices in Active Markets for Identical Assets (Level 1)                      
Debt Instrument [Line Items]                      
Long-term debt, fair value     450,684,000                
Term Loan | Term Loan B due 2029                      
Debt Instrument [Line Items]                      
Debt instrument, face amount                     $ 800,000,000
Repayments of debt         325,000,000 325,000,000          
Capitalized fees & expenses     $ 4,169,000                
Issuance price, percentage                     99.75%
Gain (loss) from debt extinguishment         (437,000) (6,296,000)          
Write of unamortized debt issuance costs   $ 3,268,000                  
Write off of deferred debt issuance cost, underwriting and other fees         386,000 5,575,000          
Write off of deferred debt issuance cost, original issuer discount   361,000     $ 51,000 $ 721,000          
S0FR floor rate 0.00%             0.50%      
Debt instrument, charges for debt amendment $ 1,700,000                    
Debt instrument, interest rate at period end     6.13%                
Debt instrument, periodic payment, principal   $ 2,000,000                  
Secured Overnight Financing Rate | Revolver Due 2025, SOFR Loan                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate     1.75%                
Secured Overnight Financing Rate | Term Loan | Term Loan B due 2029                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate, period increase (decrease) (0.25%)                    
Debt instrument, basis spread on variable rate 2.00%                    
Base Rate | Revolver Due 2025, Base Rate Loan                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate     0.75%                
Sterling Overnight Index Average | Revolver Due 2025, SONIA Loan                      
Debt Instrument [Line Items]                      
Debt instrument, basis spread on variable rate     1.75%