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RESTRUCTURING CHARGES - Summary of accrued liability for the restructuring and related charges (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance $ 12,998 $ 19,658 $ 650
Charges   41,309 92,468
Payments (8,955) (24,206) (14,528)
Non-cash charges   (23,763) (58,932)
Restructuring reserve, ending balance 4,043 12,998 19,658
Consumer and Professional Products      
Restructuring Reserve [Roll Forward]      
Charges   41,309 92,468
Payments   (17,546) (33,536)
Non-cash charges   (23,763) (58,932)
Personnel related costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 8,182 14,107 386
Charges   5,856 16,772
Payments (5,355) (11,781) (3,051)
Non-cash charges   0 0
Restructuring reserve, ending balance 2,827 8,182 14,107
Personnel related costs | Consumer and Professional Products      
Restructuring Reserve [Roll Forward]      
Payments   (5,856) (16,772)
Facilities & Exit Costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 4,816 5,551 264
Charges   11,690 16,764
Payments (3,600) (12,425) (11,477)
Non-cash charges   0 0
Restructuring reserve, ending balance 1,216 4,816 5,551
Facilities & Exit Costs | Consumer and Professional Products      
Restructuring Reserve [Roll Forward]      
Payments   (11,690) (16,764)
Facility and Other Costs      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 0 0 0
Charges   23,763 58,932
Payments 0 0 0
Non-cash charges   (23,763) (58,932)
Restructuring reserve, ending balance $ 0 $ 0 $ 0