v3.26.1
LONG-TERM DEBT - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 53 Months Ended
Aug. 05, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2020
Jun. 30, 2026
Sep. 30, 2025
Sep. 30, 2024
Jan. 24, 2024
Jan. 23, 2024
Aug. 01, 2023
Jul. 31, 2023
Sep. 30, 2022
Jan. 24, 2022
Debt Instrument [Line Items]                              
Capitalized fees and expenses   $ 7,006,000   $ 7,006,000     $ 7,006,000 $ 11,162,000              
Long-term debt, gross   1,274,786,000   1,274,786,000     1,274,786,000 1,423,811,000              
Loss from debt extinguishment   833,000 $ 0 1,389,000 $ 0                    
Revolver due 2028                              
Debt Instrument [Line Items]                              
Maximum borrowing capacity                       $ 500,000,000 $ 400,000,000    
Outstanding balance   15,000,000   15,000,000     15,000,000                
Outstanding standby letters of credit   12,652,000   12,652,000     12,652,000                
Remaining borrowing capacity   $ 472,348,000   $ 472,348,000     $ 472,348,000                
Revolver due 2028 | Letter of Credit Subfacility                              
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    
Revolver due 2028 | Multicurrency Subfacility                              
Debt Instrument [Line Items]                              
Maximum borrowing capacity                       $ 200,000,000      
Revolver Due 2025, SOFR Loan                              
Debt Instrument [Line Items]                              
Interest rate (as percent)   5.51%   5.51%     5.51%                
Revolver Due 2025, SONIA Loan                              
Debt Instrument [Line Items]                              
Interest rate (as percent)   5.51%   5.51%     5.51%                
Revolver Due 2025, Base Rate Loan                              
Debt Instrument [Line Items]                              
Interest rate (as percent)   7.50%   7.50%     7.50%                
Secured Overnight Financing Rate (SOFR) | Revolver Due 2025, SOFR Loan                              
Debt Instrument [Line Items]                              
Basis spread on variable rate (as percent)       1.75%                      
SONIA | Revolver Due 2025, SONIA Loan                              
Debt Instrument [Line Items]                              
Basis spread on variable rate (as percent)       1.75%                      
Base Rate | Revolver Due 2025, Base Rate Loan                              
Debt Instrument [Line Items]                              
Basis spread on variable rate (as percent)       0.75%                      
Senior notes due 2028                              
Debt Instrument [Line Items]                              
Capitalized fees and expenses   $ 3,366,000   $ 3,366,000     $ 3,366,000 4,880,000              
Long-term debt, gross   $ 974,775,000   $ 974,775,000     $ 974,775,000 $ 974,775,000              
Interest rate (as percent)   5.75%   5.75%     5.75% 5.75%              
Term Loan                              
Debt Instrument [Line Items]                              
Repayments of debt       $ 6,000,000                      
Term loan B due 2029                              
Debt Instrument [Line Items]                              
Capitalized fees and expenses   $ 2,086,000   2,086,000     $ 2,086,000 $ 4,169,000              
Long-term debt, gross   285,000,000   285,000,000     285,000,000 $ 449,000,000              
Term loan B due 2029 | Fair Value, Inputs, Level 1                              
Debt Instrument [Line Items]                              
Long-term debt, fair value   285,000,000   285,000,000     285,000,000                
Senior notes due 2022 | Senior Notes                              
Debt Instrument [Line Items]                              
Repayments of debt           $ 1,000,000,000                  
Interest rate, stated (as percent)           5.25%                  
Senior notes due 2028 | Senior Notes                              
Debt Instrument [Line Items]                              
Face amount           $ 1,000,000,000                  
Interest rate, stated (as percent)           5.75%                  
Capitalized fees and expenses           $ 16,448,000                  
Repurchased face amount                           $ 25,225,000  
Weighted average discount (as percent)                           91.82%  
Repurchase amount                           $ 23,161,000  
Debt issuance fees and expenses, net   3,366,000   3,366,000     3,366,000                
Senior notes due 2028 | Senior Notes | Fair Value, Inputs, Level 1                              
Debt Instrument [Line Items]                              
Long-term debt, fair value   972,338,000   972,338,000     972,338,000                
Term loan B due 2029 | Term Loan                              
Debt Instrument [Line Items]                              
Face amount                             $ 800,000,000
Repayments of debt       158,000,000     483,000,000                
Debt issuance fees and expenses, net   $ 2,086,000   $ 2,086,000     $ 2,086,000                
Debt instrument, issuance price (as percent)                             99.75%
SOFR floor (as percent)                   0.00% 0.50%        
Interest rate (as percent)   5.66%   5.66%     5.66%                
Principal payments       $ 2,000,000                      
Loss from debt extinguishment       1,389,000                      
Write-off of underwriting fees and other expenses       1,250,000                      
Original issue discount       $ 138,000                      
Term loan B due 2029 | Term Loan | Subsequent Event                              
Debt Instrument [Line Items]                              
Repayments of debt $ 285,000                            
Write off of debt issuance costs 2,018,000                            
Write off of original issuance discount $ 223,000                            
Term loan B due 2029 | Term Loan | Secured Overnight Financing Rate (SOFR)                              
Debt Instrument [Line Items]                              
Margin above SOFR, period increase (decrease)                 (0.25%)            
Basis spread on variable rate (as percent)       2.00%