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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS - Schedule of valuation and qualifying accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Consumer and Professional Products      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Impairment of inventory   $ 23,763 $ 37,100
Allowance for credit losses      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of  Year $ 10,986 11,264 12,137
Additions 566 636 971
Reductions (1,755) (1,325) (1,186)
Other 289 411 (658)
Balance at End of Year 10,086 10,986 11,264
Inventory valuation      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of  Year 56,285 55,737 22,875
Additions 1,697 27,210 44,570
Reductions (18,701) (27,353) (11,692)
Other 386 691 (16)
Balance at End of Year 39,667 56,285 55,737
Deferred tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of  Year 26,989 17,992 13,490
Additions 3,714 8,997 4,502
Reductions 0 0 0
Other 0 0 0
Balance at End of Year $ 30,703 $ 26,989 $ 17,992